Question

In a house, two 60 W electric bulbs are lit for 4 hours, and three 100 W bulbs for 5

hours every day. Calculate the electric energy consumed in 30 days​

Answer 1

Answer:

Case 1 :

Power, p1 = 60W

Number, n1 = 2

Time for use , t1 = 4h everyday

Electrical energy consumed everyday, E1 = n1 × p1 × t1

= 2 × 60 × 4 = 480 wh = 0.48 kwh

Electrical energy consumed in 30 days = 30 × 0.48 = 14.4 kwh

Case 2:

Power, P2 = 100 W

Number, n2 = 3

Time for use, t2 = 5h everyday

Electrical energy consumed everyday, E2 = n2 ×   P2 × t2

= 3 × 100 × 5 = 1500 = 1.5 kwh

Electrical energy consumed in 30 days = 30 × 1.5 = 45kWh

Total electrical energy consumed in 30 days = 14.4 kWh + 45kWh = 59.4 kWh