Question

A 300 V, 5 A, 0.2 pf low power factor wattmeter is used to measure the power consumed by a load. The wattmeter scale has 150 divisions and the pointer is on the 100th division. The power consumed by the load (in Watts) is

• A. 200

Answer 1

The correct option is A 200
At full scale the wattmeter will indicate

300 × 5 × 0.2 = 300 Watts

As the scale of the wattmeter is uniform.

$300W\to 150divisions$

$?\to 100divisions$

$=\frac{300\times 100}{150}=200Watts$