Question
How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
Answer Options
- A) 2.4 watts
- B) 24 watts
- C) 6 watts
- D) 60 watts
Correct Answer: A
Explanation
Electrical power (P) is calculated using the formula: P = V \times I, where V is the voltage and I is the current. This is the simplest form of the power calculation when voltage and current are known.
Substituting the given values, V = 12 \text{ VDC} and I = 0.2 \text{ amperes}: P = V \times I = 12 \text{ V} \times 0.2 \text{ A} = 2.4 \text{ watts.} The light bulb consumes 2.4 \text{ watts} of electrical power.
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