A current of 4 A flows through a heater element with resistance 5 Ω. What is the voltage?

A) 1 V

B) 20 V

C) 9 V

D) 25 V

Answer: B

Explanation: Ohm’s law gives voltage = current × resistance = 4 × 5 = 20 V. The relation applies to a heater element under the stated conditions.

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