4 ohms 8 ohms 13 ohms 22 ohms
I gave my students this multiple choice question: A 72 W navigation unit on a commercial aircraft has a 24 V power supply and uses 3 A of electric current. What is the electrical resistance of the navigation unit?

Only one answer is correct among these 4 choices:
- 4 ohms
- 8 ohms
- 13 ohms
- 22 ohms

Could you tell me which one is correct?

8 ohms