Tuesday 11 June 2013

An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A

Q. No 2: An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
Ans: In this problem we have
Power of the oven (P) = 2 kW = 2000 W
Potential Difference (V) = 220 V
We have P = VI
I=P/V
    = 2000/220
    = 9.09A

Here the current drawn by the electric oven is 9.09 A, which exceeds the safe limit of the circuit that is 5A. Therefore electric fuse will melt and break the circuit.

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  4. An oven of 2 kw is connected with a5 A and 220 V domestic circuit for 3 hour, calculate the energy decipated by the oven

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