Question

a 50 Watt electric bulb is lighted for 120 minutes daily and 60 watt electric bulbs are lighted for 60 minutes daily calculate the units of energy consumed in 20 hour​

Answer 1

Answer:

Case I)

in 2 hr=50watt

so E=Pt

E=100watt-hr i.e. 0.1Kwh

Case 2)

E= 60*1

• =60watt hr I.e. 0.06kwh

total energy is 0.16 kwh and total time is 3 hr

so for 20 hr,

• 20*0.16 /3
• 1.066 kwh or 1.066 units

Hence energy consumed in 20 hr is 1.07 units...