When maximum power is transferred to a load, the efficiency will be.
Correct answer: B. 50%
- A. 100%
- B. 50%
- C. 99.9%
- D. 70%
Explanation
According to the maximum power transfer theorem, maximum power is delivered from a source to a load when the load resistance equals the source's internal resistance. Under this condition, an equal amount of power is dissipated in the source and the load, resulting in an efficiency of 50%.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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