Fact 1: Electrical current running through a wire causes that wire to heat up.

Fact 2: Then the total current and Joule heating are solved.

Given the two facts above, answer the question "Electrical current running through a wire causes an increase in what?" with the following options: 
- warmth
 - speed
 - Joules
 - water current
 - energy
 - toughness
 - distance
 - lightning


 

   Joules      