If the peak current is increased by a factor of 2, then the percentage change in the peak power is (assume voltage is constant);
Correct answer: A. 100%
- A. 100%
- B. 200%
- C. 50%
- D. No change
Explanation
Peak power P = I (peak) × V (peak) . Assuming voltage is constant, if I (peak) is doubled, the new power P' = (2I (peak) )V (peak)= 2P. A doubling of power represents a 100% increase from the original value.
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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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