Question

Which of the following statements is CORRECT regarding a purely resistive circuit?
1. Work done is zero
2. Power consumed is zero
3. Heat produced is zero
4. Power factor is unity

Answer 1

Correct Answer - Option 4 : Power factor is unity

For an ideal resistor:

• The value of resistance is non-zero.
• Work done is non-zero
• The heat produced is non-zero
• Voltage drop is non-zero
• Strictly follows the OHM’s law V = IR for any value of V and I
• Should not introduce any phase difference i.e. power factor is unity.

 

​In a purely Resistive circuit only resistance has presents which mean heat produced by the element is Non-zero and it is given by 

H = I2R × t

I = current, R = resistance. t = time