# Basic Electrical Engineering Questions and Answers – The Current in a Series RLC Circuit

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This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “The Current in a Series RLC Circuit”.

1. In a series RLC circuit, the phase difference between the current in the capacitor and the current in the resistor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, the phase difference between the current in the capacitor and the current in the resistor is 00 because same current flows in the capacitor as well as the resistor.

2. In a series RLC circuit, the phase difference between the current in the inductor and the current in the resistor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, the phase difference between the current in the inductor and the current in the resistor is 00 because same current flows in the inductor as well as the resistor.

3. In a series RLC circuit, the phase difference between the current in the capacitor and the current in the inductor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, the phase difference between the current in the inductor and the current in the capacitor is 00 because same current flows in the inductor as well as the capacitor.

4. In a series RLC circuit, the phase difference between the current in the circuit and the voltage across the resistor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, the phase difference between the voltage across the resistor and the current in the circuit is 00 because they are in phase.

5. In a series RLC circuit, the phase difference between the current in the circuit and the voltage across the capacitor is?
a) 00
b) 900
c) 1800
d) 3600

Explanation: In a series RLC circuit, voltage across capacitor lags the current in the circuit by 900 so, the phase difference between the voltage across the capacitor and the current in the circuit is 900.
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6. _________ the resonant frequency, the current in the inductor lags the voltage in a series RLC circuit.
a) Above
b) Below
c) Equal to
d) Depends on the circuit

Explanation: The current in the inductor lags the voltage in a series RLC circuit if a circuit is inductive dominant i.e. if XL > XC
ωL > 1/ωC => ω > 1/√LC => ω > ω0.
So, the current in the inductor lags the voltage in a series RLC circuit above the resonant frequency.

7. _________ the resonant frequency, the current in the capacitor leads the voltage in a series RLC circuit.
a) Above
b) Below
c) Equal to
d) Depends on the circuit

Explanation: The current in the capacitor leads the voltage in a series RLC circuit if circuit is capacitive dominant i.e.i.e. if XL < XC
ωL < 1/ωC => ω < 1/√LC => ω < ω0.
So, the current in the capacitor leads the voltage in a series RLC circuit below the resonant frequency.

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