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UPCAT Science practice question 39: A potential difference of 12 V is applied across a 4 Ω resistor. What current flows through it?

Correct answer

A. 3 A

By Ohm's law, I = V / R = 12 V ÷ 4 Ω = 3 A.

A potential difference of 12 V is applied across a 4 Ω resistor. What current flows through it?

  1. 3 ACorrect
  2. 0.33 A
  3. 16 A
  4. 48 A

Why A is correct

By Ohm's law, I = V / R = 12 V ÷ 4 Ω = 3 A.

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