A power amplifier yields an output signal voltage of 5V and current of 200 mA, with both measurements in r.m.s. Determine the power output ?
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Answer: A. 1 W
Explanation
AC power output is calculated by multiplying the root-mean-square voltage by the root-mean-square current value. Multiplying five volts by zero point two amperes yields a mathematical product of exactly one watt. This straightforward calculation assumes a purely resistive load where voltage and current waveforms remain perfectly in phase. Root-mean-square values represent the effective DC-equivalent values for alternating voltage and current electrical waveforms. Electric power in watts equals the product of potential difference in volts and electrical current in amperes. Ohm's law and power formulas form the foundational principles for analyzing all electronic circuits and power systems.
Two watts represents an incorrect calculation resulting from improper multiplication or scaling of the voltage and current values. Four watts is an erroneous value that does not correspond to the mathematical product of five volts and two hundred milliamperes. None of the above is incorrect because the correct calculated power output of one watt is explicitly listed as option A.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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