# Electric Power Formula

This light bulb is rated at 60 watts,but what does that mean. Let’s take a look at the electric power formula to see what 60 watts represents.

**Electric power** is the rate, at which electrical energy is transferred by an electric circuit.

The formula for electric power is,

Electric Power = Volts x Current and can be written as **P = V x I**

- V = voltage
- I is current intensity

**Voltage **is what pushes free electrons around a circuit The greater the voltage the greater the current and as voltage decreases the current will also decrease. It is a measure of potential work. In other words, voltage is a measure of how much work can potentially be done

**Voltage** is measured in volts

- A volt is the work required in Joules to move one Coulomb of charge from A to B
- It is expressed as 1 Joule/Coulomb
- In simple terms Voltage is a measure of potential energy.

Ok but what is a Coulomb?

**Coulomb** is a measure in charge It is equal to 1/(1.6×10−19) elementary charges which is the charge of a single proton or the negative charge of a single electron.

Another way you can think of a Coulomb is that it is a bag of electrons and each electron has a charge. It takes 6.2415 x 10^18 electrons to make one Coulomb.

Again a** Coulomb** is a measure of charge.

Current is all about movement. It is measured in **amperes** and is a measure of 1 Coulomb of charge passing a point in a circuit every second and is written as Coulomb/second.

In other words an amp is 6.24 x 10^18 electrons flowing past a point each second.

A** joule** of energy is defined as the energy expended by one ampere at one volt, moving in one second.

So let’s go back to the 60 watt bulb.

A 60 Watt bulb uses 60 Joules of energy each second it is on.
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