newtons joules volts watts
I gave my students this multiple choice question: Light bulbs vary in their ability to use electrical energy efficiently. Alicia compared the amount of electrical energy needed to light an incandescent bulb and a fluorescent bulb. Which units would Alicia use to compare electrical energy usage?

Only one answer is correct among these 4 choices:
- newtons
- joules
- volts
- watts

Could you tell me which one is correct?

joules