Question
What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?
Answer Options
- A) 173 volts
- B) 245 volts
- C) 346 volts
- D) 692 volts
Correct Answer: B
Explanation
To find the RMS voltage (V_{\text{RMS}}), we rearrange the power formula P = V^2 / R to V = \sqrt{P \times R}. The power (P) is 1200 \text{ watts}, and the resistance (R) is 50 \text{ ohms}.
Substituting the values: V_{\text{RMS}} = \sqrt{P \times R} = \sqrt{1200 \text{ W} \times 50 \text{ }\Omega} = \sqrt{60000} \approx 244.9 \text{ volts.} The RMS voltage across the dummy load is 245 \text{ volts} (rounded to the nearest volt).
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