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		<h1>Hướng dẫn giải bài tập SGK Vật lý lớp 7 bài 25&#x3A; Hiệu điện thế</h1>
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			Hướng dẫn giải bài tập SGK Vật lý lớp 7 bài 25: Hiệu điện thế
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			<p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 1:</strong>&nbsp;Trên mỗi nguồn điện có ghi giá trị hiệu điện thế giữa hai cực của nó khi chưa mắc vào mạch. Hãy ghi các giá trị này cho các nguồn điện dưới đây:</em></p><ul style="margin: 0px 0px 0px 26px; padding-right: 0px; padding-bottom: 8px; padding-left: 0px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; list-style: none; color: rgba(0, 0, 0, 0.87);">	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Pin tròn:.......V</em></li>	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Acquy của xe máy: .......V</em></li>	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Giữa hai lỗ của ổ lấy điện trong nhà: .......V.</em></li></ul><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:</strong></em></p><ul style="margin: 0px 0px 0px 26px; padding-right: 0px; padding-bottom: 8px; padding-left: 0px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; list-style: none; color: rgba(0, 0, 0, 0.87);">	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;">Pin tròn: 1,5V</li>	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;">Acquy của xe máy: 6V hoặc 12V</li>	<li style="margin: 0px; padding: 0px 0px 4px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; list-style-type: disc;">Giữa hai lỗ của ổ lấy điện trong nhà: 220V</li></ul><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 2:</strong>&nbsp;Tìm hiểu vôn kế</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">1. Trên mặt vôn kế có ghi chữ V. Hãy nhận biết kí hiệu này ở các vôn kế trong hình 25.2a, b.</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2. Trong các vôn kế ở hình 25.2, vôn kế nào dùng kim, vôn kế nào hiện số?</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3. Hãy ghi đầy đủ vào bảng 1.</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><img alt="Giải bài tập SGK Vật lý lớp 7" class="lightbox" data-i="0" height="121" src="https://sachgiai.com/uploads/news/2018_02/giai-bai-tap-trang-69-70-71-sgk-vat-ly-lop-7-hieu-dien-the-3.png" style="margin: 0px auto; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; cursor: zoom-in; height: auto; max-width: 100%; display: block;" title="Hiệu điện thế" width="268" /></em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:<br  /><img alt="" src="https://sachgiai.com/uploads/news/2018_02/giai-bai-tap-trang-69-70-71-sgk-vat-ly-lop-7-hieu-dien-the-2.png" /></em></strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">1. Một chốt của vôn kế có ghi dấu &quot;+&quot; (cực dương), chốt kia có ghi dấu &quot;-&quot; (cực âm).</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">2. Vôn kế hình 25.2a và 25.2b dùng kim. Vôn kế hình 25.2c hiện số.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">3. Bảng 1</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">&nbsp;</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 3:</strong>&nbsp;Từ bảng 2, so sánh số vôn ghi trên vỏ pin với số chỉ của vôn kế và rút ra kết luận</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><img alt="Giải bài tập trang 69, 70, 71 SGK Vật lý lớp 7" class="lightbox" data-i="2" height="121" src="https://sachgiai.com/uploads/news/2018_02/giai-bai-tap-trang-69-70-71-sgk-vat-ly-lop-7-hieu-dien-the-3_1.png" style="margin: 0px auto; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; cursor: zoom-in; height: auto; max-width: 100%; display: block;" title="Hiệu điện thế" width="268" /></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:</strong></em>&nbsp;Số chỉ vôn kế bằng số vôn ghi trên vỏ nguồn điện.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 4:</strong>&nbsp;Đổi đơn&nbsp;vị cho các giá trị sau:</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">a) 2,5V = ....mV</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">b) 6kV = ....V</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">c) 110V = .....kV</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">d) 1200mV = .....V</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:</em></strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">a) 2,5V = 2500mV</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">b) 6kV = 6000V</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">c) 110V = 0,110kV</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">d) 1200mV = 1,200V</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 5:</strong>&nbsp;Quan sát mặt số của một dụng cụ đo điện được vẽ trên hình 25.4 và cho biết:</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">a) Dụng cụ này có tên gọi là gì? Kí hiệu nào trên dụng cụ cho biết điều đó?</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">b) Giới hạn đo và độ chia nhỏ nhất của dụng cụ.</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">c) Kim của dụng cụ ở vị trí (1) chỉ giá trị bao nhiêu?</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">d) Kim của dụng cụ ở vị trí (2) chỉ giá trị bao nhiêu?</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><img alt="Giải bài tập trang SGK Vật lý lớp 7" class="lightbox" data-i="1" height="154" src="https://sachgiai.com/uploads/news/2018_02/giai-bai-tap-trang-69-70-71-sgk-vat-ly-lop-7-hieu-dien-the-4.png" style="cursor: zoom-in; margin: 0px auto; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; height: auto; max-width: 100%; display: block;" title="Hiệu điện thế" width="228" /></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:</em></strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">a) Dụng cụ này gọi là vôn kế. Kí hiệu chữ V trên dụng cụ cho biết điều đó.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">b) Dụng cụ này có GHĐ là 45V và ĐCNN là 1V.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">c) Kim của dụng cụ ở vị trí (1) chỉ giá trị 3V.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">d) Kim của dụng cụ ở vị trí (2) chỉ giá trị là 42V.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Câu 6:</strong>&nbsp;Có ba nguồn điện với số vôn ghi trên vỏ lần lượt là:</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">a) 1,5V &nbsp; &nbsp; &nbsp; &nbsp;b) 6V &nbsp; &nbsp; c) 12V</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Có ba vôn kế với giới hạn đo lần lượt là:</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">1) &nbsp;20V &nbsp; &nbsp; &nbsp; 2) 5V&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3) 10V</em></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><em style="margin: 0px; padding: 0px; border: 0px; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài giải:</em></strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">a) Dùng vôn kế 2) có GHĐ 5V</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">b) Dùng vô kế 3) có GHĐ 10V</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87);">c) Dùng vôn kế 1) có GHĐ 20V</p>
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