1.

A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.

Answer»

V=250v

i=0.4A

r=v/i

r=250/0.4

r=2500/4

resistance=625 ohm

p=vi

v=250v ,i=0.4a

p=(250*0.4)w=100w

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