Question

A 100w 200v bulb is connected to a 160v supply. The actual power consumption would be

Answer 1

Given ,

For bulb,

Power , P = 100 W , V = 200 V

As we know ,

P = V^2/R,

R = V^2/P     

=200×200/100 

= 400 Ohm

So, For 160 V supply ,

as V = I R

So, I = 160400=0.4 A

Power Consumption ,

P = V I  

 = 160 ×0.4 

= 64 W

Answer 2

Answer :-

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R = V^2/P      

=200×200/100  

= 400 Ohm

So, For 160 V supply ,

as V = I R

So, I = 160400=0.4 A

Power Consumption ,

P = V I  

 = 160 ×0.4  

= 64 W

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