Question
How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?
Answer Options
- A) 0.5 watts
- B) 200 watts
- C) 400 watts
- D) 3200 watts
Correct Answer: B
Explanation
Electrical power (P) can be calculated using Ohm’s Law and the power formula (P=VI). Since the current (I) is not given, we use the derived formula for power using voltage (V) and resistance (R): P = V^2/R.
Substituting the given values, V = 400 \text{ VDC} and R = 800 \text{ ohms}: P = \frac{V^2}{R} = \frac{(400 \text{ V})^2}{800 \text{ }\Omega} = \frac{160000}{800} = 200 \text{ watts.} The electrical power consumed is 200 \text{ watts}.
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