Question:
The power factor of a purely resistive AC circuit is
The power factor of a purely resistive AC circuit is
Show Hint
Pure resistor has unity power factor because voltage and current are in phase.
Updated On: May 27, 2026
- Zero
- Unity
- Lagging
- Leading
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Power factor is:
\[
\cos\phi
\]
where \(\phi\) is the phase angle between voltage and current.
Step 1: In a purely resistive AC circuit, voltage and current are in the same phase. \[ \phi=0^\circ \]
Step 2: Therefore: \[ \cos\phi=\cos0^\circ=1 \]
Step 3: Hence, the power factor is unity. Therefore: \[ \boxed{\text{Unity}} \]
Step 1: In a purely resistive AC circuit, voltage and current are in the same phase. \[ \phi=0^\circ \]
Step 2: Therefore: \[ \cos\phi=\cos0^\circ=1 \]
Step 3: Hence, the power factor is unity. Therefore: \[ \boxed{\text{Unity}} \]
Was this answer helpful?
0
0
Top AP ECET EEE Electrical Engineering Questions
- Ohm's law states that
- The unit of electrical resistance is
- Kirchhoff's current law is based on the conservation of
- Kirchhoff's voltage law is based on the conservation of
- The material having nearly zero temperature coefficient of resistance is
View More Questions
Top AP ECET EEE AC Circuits Questions
- The unit of inductance is
- Energy stored in an inductor is given by
- The opposition offered by an inductor to alternating current is called
- The opposition offered by a capacitor to alternating current is called
- In a purely inductive circuit, current
View More Questions