You are presented with the question "What can run through copper, causing it to heat up?" and the following answer choices: 
- activation energy
 - oxygen
 - water
 - an electron lens
 - electromagnetic energy
 - ice
 - hydrogen and oxygen
 - electrical current

Now knowing that electrical current running through a wire causes that wire to heat up and copper is used in wires and such, choose the best answer.


 

        electrical current 