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e.m.f. vs voltage
發問:
what is the difference between e.m.f. and voltage?
最佳解答:
"Voltage" is a more general term. It refers to the "potential difference" across two points, e.g. the two ends of a resistor. "e.m.f." (electromotive force) only applies only to power sources (e.g. a battery or an electric generator). It is the voltage across the terminals of a power source when it is not delivering any current, i.e. under a no-load condition. Hence, you would say a battery of emf 10 volts, but the voltage across a filament light bulb is 220 volts.
其他解答:
Voltage is defined as the amount of energy GAINED/LOST when 1C of charge passes through two points in a circuit. It can be divided into e.m.f. and potential difference. E.m.f. is the amount of energy GAINED by 1C of charge when passing through two points in a circuit.
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