Stu wanted to calculate the resistance of a light bulb connected to a 4.0 V battery, with a resulting current

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 Ω. Was Stu’s answer correct? How do you know?

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