Electro dynamic type watt meters have large errors while measuring power in a.c circuits at low power factor conditions, since the voltage across and the current though the

Two $$100$$ $$\mu A$$ full scale $$PMMC$$ meters are employed to construct a $$10$$ $$V$$ and a $$100$$ $$V$$ full scale voltmeter. These meters will have figures of merit (sensitivities) as

A current of $$\left[ {2 + \sqrt 2 \sin \left( {314t + 30} \right) + 2\sqrt 2 \cos \left( {952t + 45} \right)} \right]$$ is measured with a thermocouple type. $$5A$$ full scale, class $$1$$ meter. The meter reading would like in the range,

For the given circuit the internal resistance of the ammeters as well as that of the current coil of the wattmeter are zero, and the voltmeters have a very large figure of merit. $${A_1}$$ is a $$6A$$ full scale moving $${\rm I}$$ron type meter. $${A_2}$$ is a commercial full wave rectifier type meter of full scale $$5A$$. $${V_1}$$ is a $$500V$$ meter is an peak response type. $${V_2}$$ is a $$300V$$ $$PMMC$$ type meter and $$W$$ is an electro dynamometer type, $$5A$$, $$230V$$ wattmeter. Determine the readings of $${A_1},$$ $${A_2},$$ $${V_1},$$ $${V_2},$$ and $$W.$$