If Irms * Vrms = 100 watt then Io * Vo =?
Correct answer: B. 200 watt
- A. 100 watt
- B. 200 watt
- C. 282.84 watt
- D. None
Explanation
In AC systems, the RMS values are used to express power similar to DC systems. Given that Irms * Vrms = 100 watts, the peak power, Po, can be calculated using the relationship between RMS and peak values: Io = Irms * √2 and Vo = Vrms * √2. Hence, Po = (Irms * √2) * (Vrms * √2) = 2 * Irms * Vrms = 2 * 100 watts = 200 watts. Therefore, the correct answer is 200 watts. Other options are incorrect as they either fail to apply the conversion factor correctly or do not represent possible outcomes based on the given RMS power.
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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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