Answer :

(a) Lamp has the greatest electrical resistance as resistance oppose the flow of current, and the lamp has least amount of current.

(b) According to the given data large amount of current is needed by kettle, so it must be connected to the earthing.

(c) As we know that

P = VI

V = 240V, I = 8.5A

P = 240X8.5 = 2040 W = 2.04 kW

(d) When kettle is connected to 240 V supply, then the P = 2040 W

R = V2/P =

R = 28.23 ohm

Now, when V = 120V, R = 28.23 ohm

I = V/R = 120/28.23 = 4.25A

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