1.

A mixer of 750 W 250 volt and a washing machine of 1750 W 250 volt are to be used from a household supply. The rating of fuse to be used is

Answer»

Answer:

(a) V = 230V, P = 750 W, t = 30/60 = 0.5hr

(i) Let max current be I

We have P = VI

750 = 230 x I

I = 3.26 A

(ii) Electric ENERGY consumed, E = P x t = 0.75kW x 0.5h = 0.375 kWh

No. of UNITS used in 30 min = 0.375

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