Question

Mr. Sharma called an electrician to do wiring in his newly constructed house. Electrician made the

connections of three fans of 80 W each and four tube lights of 40 W each.

(i). The most convenient way to do household wiring is in

(a) Series combination (b) Parallel combination

(c) May be series or parallel combination (d) Neither series nor parallel combination

(ii). The advantage of the combination in which household wiring is done, is

(a) The reciprocal of equivalent resistance is less than that of each device

(b) If one device gets damaged, there will be no effect on the other devices

(c) The current from the source is greater than the current through each device

(d) There will be more power consumption by the devices

(iii) If all the devices are used for 10 h daily, total energy consumed in a day is

(a) 2 kWh (b) 3 kWh (c) 4 kWh (d) 5 kWh​

Answer 1

1. The convenient way to do household wiring is in parallel connection

2. B. if one device gets damaged, there will be no effect on other devices

3. We know that

        Energy = power x time

                     = (3x80+4x40)x10

                     = 4 kwh

Hope this helps