# How to calculate the amount of amps from watts

In this video we’ll show you an easy way to calculate amps from watts or the other way around. This can be useful especially when you are using high power lights and want to make sure your fuse or circuit breaker wont cut the power.

Written instructions:

In this video we’ll show you how to calculate the amount of current, measured in amperes, from the amount of power, measured in watts, that your appliance is using.

The basic formula for calculating between watts, and amps, is, P, equals, U, times, I, in which P stands for power, U stands for voltage, and I, stands for current.

Power is measured in watts, voltage is measured in volts, and current is measured in amps.

This means we can say the formula like this: Watts, equal, volts, times, amps.

Let’s take a look at an example in which we know that our appliance is using 500 watts. The amount of watts is usually printed somewhere on your device. The next thing we need to know is the voltage. The voltage of US mains electricity is 100 and 20 volts. Inside EU countries the voltage is usually 200 and 30 volts. Let’s use the US number for this example.

So our equation looks like 500 equals 100 and 20 times X. To find out the value of X, we simply divide both sides with 100 and 20, so we’ll end up with just one X on the right side. The left side becomes 4 point 16. So x equals 4 point 16, or in other words using a 500 watt appliance in the US takes 4 point 16 amps.

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