Question

Calculate the value of input current(in mA) from the 250V mains supply if a person is to use an output current of 3670 mA at 12V. Calculate the value of input current(in mA) from the 250V mains supply if a person is to use an output current of 3670 mA at 12V.

Answer 1

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

(b) 5 A fuse rating will be suitable for this electric iron as the maximum current for this iron is 3.26 A.

Answer 2

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