What is the power factor for a purely inductive or purely capacitive AC circuit?
0
In an AC circuit, power factor (PF) is defined as the cosine of the phase angle (ϕ) between the current and voltage. It is represented as:
PF = cos(ϕ)
1. In purely inductive or purely capacitive circuits, the phase difference between current and voltage is 90 degrees because:
- In a purely inductive circuit, voltage leads the current by 90°.
- In a purely capacitive circuit, current leads the voltage by 90°.
2. For a 90-degree phase difference, the cosine value is:
cos(90°) = 0
3. Therefore, the power factor for both purely inductive and purely capacitive circuits is:
0
Thus, the correct answer is 0.
Important Questions from Power in Electric Circuits
Which one of the following terms cannot represent electrical power in a circuit?
An electric bulb is connected to 220 V generator. The current drawn is 600 mA. What is the power of the bulb?
- What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V ?
Which one of the following formulas does not represent electrical power?
In an electric circuit, a wire of resistance 10 Ω is used. If this wire is stretched to a length double of its original value, the current in the circuit would become :
