Question

(i) Write an expression for the electrical energy spent in the flow of current through an electrical appliance in terms of I, R and t. 

(ii) At what voltage is the alternating current supplied to our houses? 

(iii) How should the electric lamps in a building be connected?

Answer 1

(i) Electrical energy (E) = I² .R.f. 

(ii) Alternating current is supplied at 220V for domestic consumption. 

(iii) All lamps should be connected in parallel.