A 12 V battery is connected to a single resistor of resistance 2 Ω. What is the electric current flowing through the resistor and what is the power dissipated by the resistor?

easy 2 marks Class 6 · Science · Electricity and Circuits

Answer

Current = 6 A, Power = 72 W

The correct answer is Current = 6 A, Power = 72 W — Use the power formula $P = V I$ to find the power: $P = 12, V \times 6, A = 72, W$ .

Step-by-step solution

Use Ohm’s law $V = I R$ to find the current: $I = \frac{V}{R} = \frac{12 , V}{2 , Ω} = 6, A$ .
Use the power formula $P = V I$ to find the power: $P = 12, V \times 6, A = 72, W$ .

Common mistake: Using the wrong formula or units for current or power

Concept tested: Ohm’s law and power calculation