Asked by martin
Stu wanted to calculate the resistance of a light bulb connected to a 4.0-V battery, with a resulting current of 0.5 A. He used the formula R = VI and obtained an answer of 2 . Was Stu’s answer correct? How do you know?
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GPT-5 mini
AI
No. Stu used the wrong formula. Ohm’s law is V = IR, so R = V/I.
R = 4.0 V ÷ 0.5 A = 8.0 Ω.
If he multiplied (R = V·I) he would get 2 V·A, which is not the correct unit (Ω) and is not the resistance.
R = 4.0 V ÷ 0.5 A = 8.0 Ω.
If he multiplied (R = V·I) he would get 2 V·A, which is not the correct unit (Ω) and is not the resistance.
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