Alternating Currents — Important Questions
Telangana Open School (TOSS) · Class 12 · Physics
51 important questions from Alternating Currents for Telangana Open School (TOSS) Class 12 Physics, with answers. Written for the board exams 2027.
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Important Questions from Alternating Currents
For a purely resistive AC circuit, the phase difference between voltage and current is:
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0°
In a purely resistive circuit, voltage and current are in phase, meaning they reach their maximum and minimum values at the same time.
The average power consumed in a pure capacitor connected to AC is:
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Zero
A pure capacitor stores and releases energy alternately, so the average power consumed over a cycle is zero.
The unit of capacitive reactance is:
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Ohm
Capacitive reactance \( X_C = 1/(\omega C) \) opposes AC current and is measured in ohms, similar to resistance.
In a pure inductor, the current:
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Lags the voltage by 90°
In a pure inductor, the current lags behind the voltage by a phase angle of 90° due to self-inductance.
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