- 1(current)
Q. No.A resistance \(R\) draws power \(P\) when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes \(Z\), the power drawn will be:
| 1. | \(P\Big({\large\frac{R}{Z}}\Big)^2\) | 2. | \(P\sqrt{\large\frac{R}{Z}}\) |
| 3. | \(P\Big({\large\frac{R}{Z}}\Big)\) | 4. | \(P\) |
Subtopic: Â Power factor |
 61%
Level 2: 60%+
NEET - 2015
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In an electrical circuit \(R,\) \(L,\) \(C\) and an AC voltage source are all connected in series. When \(L\) is removed from the circuit, the phase difference between the voltage and the current in the circuit is \(\tan^{-1}\sqrt{3}\). If instead, \(C\) is removed from the circuit, the phase difference is again \(\tan^{-1}\sqrt{3}\). The power factor of the circuit is:
| 1. | \(\dfrac{1}{2} \) | 2. | \(\dfrac{1}{\sqrt{2}}\) |
| 3. | \(1 \) | 4. | \(\dfrac{\sqrt{3}}{2}\) |
Subtopic: Â Power factor |
 82%
Level 1: 80%+
AIPMT - 2012
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The instantaneous values of alternating current and voltages in a circuit are given as,
\(i=\frac{1}{\sqrt{2}}\sin\left(100\pi t \right )~\text{Ampere}\)
\(e=\frac{1}{\sqrt{2}}\sin\left(100\pi t+\pi /3 \right)~\text{Volt}\)
What is the average power consumed by the circuit in watts?
\(i=\frac{1}{\sqrt{2}}\sin\left(100\pi t \right )~\text{Ampere}\)
\(e=\frac{1}{\sqrt{2}}\sin\left(100\pi t+\pi /3 \right)~\text{Volt}\)
What is the average power consumed by the circuit in watts?
| 1. | \( \frac{\sqrt{3}}{4} \) | 2. | \( \frac{1}{2} \) |
| 3. | \( \frac{1}{8} \) | 4. | \( \frac{1}{4}\) |
Subtopic: Â Power factor |
 77%
Level 2: 60%+
AIPMT - 2012
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- 1(current)
Q. No.
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