Question

5 bulbs each rated 1000watts are used for 4 hours, heater rated 1500 watts used for 2 hours an electric iron rated 1000watts is used for 5 hours.calculate the total energy consumed by them in terms of the commercial unit of energy​

Answer 1

Answer:there is your anwer

Explanation:Five bulbs each having 100 W power are used for 4h,a heater having 1500 W power is used for 2 h and an electric iron of power 1000 W is used for 5 h.

(i) Calculate the total energy consumed by them,

(ii) Convert this energy into joules.

created

Nov '16

last reply

Nov '16

1

reply

prasanna

Nov '16

(i) Energy consumed by five bulbs =5 x 100 x 4 / 1000 = 2 units

Energy consumed by 1 heater =1500 x 2 /1000 = 3 units

Energy consumed by electric iron = 1000 x 5 / 1000 = 5 units

Total energy consumed by them = (2 + 3 + 5)

= 10 units

(ii) 1 unit or kWh =3.6x ${{10}^{6}}$ J

10 units = 3.6 x10s X10J = 3.6 x ${{10}^{7}}$ J

Answer 2

Answer:  55 KWH

Explanation:

total power of bulbs = 5*1000*4=20 KWH

Total power of heater= 1500*2= 30 KWH

total power of iron = 5*1000= 5 KWH

Adding all = 20 KWH + 30 KWH + 5 KWH = 55 KWH