1.

An electric iron is rated 220 V,2 kW. (i) If the iron is used for 2h daily find the cost of running it.for one week if it costs R 4.25 per kWh. (ii) Why is the fuse absolutely necessary in a power circuit? 

Answer»

(i) Electrical energy consumed daily - Power x Time = 2 kw x 2h = 4 kwh 

Electrical energy consumed in one week = 4 kWh x 7 = 28 kWh 

.'. Total cost for running it for one week = R 4.25 x 28 = R 119 

(ii) Fuse is necessary in power circuits to limit threats to human life and property damage due to excessive current or faulty appliance that may get connected to the power circuit.



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