# A lamp consumes 500 J of electrical energy in 20 seconds. What is the power of the lamp? Also find the electrical energy consumed in units if the lamp operates for 2 hours daily for 15 days. URGENT!!!!

2
by Yasmin

2014-12-23T03:09:16+05:30

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Energy consumed = power * time duration

Power  = energy consumed / time duration of consumption
= 500 Joules / 20 seconds
= 25 Watts or Joules/sec

Lamp has a constant power rating.

energy consumed in 15 days
= 25 watts * (2 * 3600 sec) / day * 15  days
=  2,700 kilo Joules
or,
= 25 watts * 2 hours /day * 15 days = 750  watt hours
= 0.750 kWH      kilo watt hours

2014-12-23T12:48:34+05:30
Power=work/time =500j/20s=50/2=25watts  electrical energy consumed=power in watts x time  in hours/1000  =25 x 2 x15/1000 = 750/1000 =0.75 units