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Question

An electrical appliance is rated as 90 W - 225 V. How much current will flow through the appliance when in use?


  1. 0.5 A

  2. 0.4 A

  3. 0.6 A

  4. 0.7 A


Solution

The correct option is B

0.4 A


90 W - 225 V  power rating of appliance means, If an appliance is put it on a 225 V circuit, it will consume 90 W of electrical energy i.e., electrical energy consumed by it in 1 sec is 90 J.

We know that, 

I = PV

V = 225 V

P = 90 W

I = 90225

I = 0.4 A

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