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What is the difference between volts and watts?

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Watts is the product of amps and volts. It's amps times volts. The watt (W) is a measure of power (P). It's the SI unit of power, actually, and it's a joule per second. The volt is a measure of electrical potential difference, and is the SI (derived) unit of electromotive force, or EMF (E). Voltage, which is measured in volts (V), is the force that drives electron current flow (I), which is measured in amps (A). In relationship to the volt, the watt is current flow times voltage, or, said another way, a watt is amps times volts. As regards watts and volts, they are "linked" by current. Let's look at the expressions: Power = Current x Electromotive force => P = I x E Power (in watts) = Current (in amps) x Electromotive force (in volts)
Voltage is a measure of electric potential, in joules per coulomb. Watts is a measure of energy transfer rate, in joules per second.

To complete the answer, amperes is a measure of charge transfer rate, in coulombs per second, which is why voltage (joules per coulomb) time amperes (coulombs per second) is watts (joules per second).
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