File:Voltmeter_hg.jpg · Wikimedia Commons · See Wikimedia Commons
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A voltmeter is a device that measures the electrical potential difference (voltage) between two points in an electrical circuit. It's useful because knowing the voltage helps people understand how much electrical energy is available or being used in a device or system.
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Wikidata facts
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- CH Capdella, 3 voltímetres.jpg
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- Commons category
- Voltmeters
- topic's main category
- Category:Voltmeters
- measures
- voltage
- different from
- voltameter
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Article · 中文
电压表为科学仪器，又称伏特计，常用于电磁学中。电压表是用来测量电压的大小，单位通常为伏特（V）。电压表一般以並聯的方式連結至所需量度電壓的電路元件之中。电压表的電阻一般很大，以避免使被量度的電壓改變。
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