A device used to measure voltage. Voltmeter is usually connected in parallel with the electric circuitry to be measured. The resistance of voltage is very high, so that the voltage to be measured is not affected.

【电】伏特计；电压计。测量电压的一种仪器。伏特计一般以并联的方式连结至所需量度电压的电路元件之中。伏特计的电阻一般很大，以避免使被量度的电压改变。