Question

A wattmeter is connected as shown in the figure.
The wattmeter reads

• A. Zero always
• B. Total power consumed by $Z_1$ and $Z_2$
• C. Power consumed by $Z_1$
• D. Power consumed by $Z_2$

Answer 1

The correct option is D Power consumed by $Z_2$


Potential coil draws negligible current,so current
through $Z_{1}and{Z}_2$ is same.

$Currentthroughcurrentcoil=I_{cc}=I$

$Voltageacrosspotentialcoil=V_{pc}$

$Voltageacross{Z}_2=V_{pc}=V$

Wattmeter reads power consumed by $Z_2,$ as voltage across potential coil=Voltage across $Z_2$

Current though current coil = Current through $Z_2$