In a R-C circuit

Assessment: WAEC SSCE - Physics - 2012 (Objective) Subject: Physics

Question 1 Report

In a R-C circuit

I^rms leads V^rms by 60^o

I^rms slags V^rms by 60^o

V^rms lags I^rms by 90^o

V^rms leads I^rms by 90^o

Answer Details

In an R-C circuit, a resistor R and a capacitor C are connected in series to an AC voltage source. When an AC voltage is applied to a capacitor in a circuit, it takes some time to fully charge, as the capacitor acts like an open circuit to DC, but passes AC through it. As a result, the current flowing through the circuit will lag the voltage by some angle. This angle is determined by the ratio of the resistance and capacitance in the circuit. Therefore, in a R-C circuit, V^rms leads I^rms by 90^o.

Read lesson note on Capacitors (JAMB)

Read lesson note on Simple A.C. Circuits (WAEC)

Capacitors

Simple A.C. Circuits

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In a R-C circuit

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