A 25-Ω resistor is wired directly across a 120-V ac source. What happens to the time-average power, rms voltage, and rms current when the resistor’s value changes to 50 Ω?
Answer to relevant QuestionsA 25-Ω resistor is wired directly across a 120-V ac source. What happens to the time-average power, rms voltage, and rms current when the ac source is changed to 240 V? What are the resistance, peak current, and power level of a computer monitor that draws an rms current of 0.833 A when connected to a 120-V outlet? A single 2.0-μF capacitor is connected across the terminals of a 60-Hz voltage source, and a current of 2.0 mA is measured on an ac ammeter. What is the capacitive reactance of the capacitor? A capacitor is connected to a variable-frequency ac voltage source. (a) If the frequency increases by a factor of 3, the capacitive reactance will be (1) 3, (2) 1/3, (3) 9, (4) 1/9 times the original reactance. Why? (b) If ...A series RC circuit has a resistance of a250-Ω and a capacitance of 6.0 μF. If the circuit is driven by a 60-Hz source, find (a) The capacitive reactance and (b) The impedance of the circuit.
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