# How many watt-hours are there in 1000 joules? Please explain mathematically.

##### 1 Answer

Mar 1, 2018

0.278 watt-hours

#### Explanation:

Start with the basic definition:

1 Joule is energy lost as heat when an electric current of 1 ampere passes through a resistance of 1 ohm for 1 second.

Consider the power generated in the above circuit in watts:

So that is 1 watt-second

1 hour is 3600 seconds

Or

Or

So 1000 joules will be

0.278 watt-hours