A.C. and D.C. have the same __________?
Correct answer: D. Heating effect through a resistance
- A. Affect in charging a capacitor
- B. Affect in charging a battery
- C. Affect while passing through an inductance
- D. Heating effect through a resistance
Explanation
Both AC and DC produce thermal energy in a resistance, with the heating effect determined by power and, for AC, by the RMS current: P = I²R, in watts when I is in amperes and R is in ohms. Their effects on capacitors and inductors are not generally the same, so students may incorrectly choose capacitor charging by focusing on the fact that both currents can charge a capacitor under some conditions.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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