Four bulbs , each of rating (100w to 220v) & connected in parallel across a voltage supply of 220V ,are operated for five hours daily . if all bulbs are replaced by LEDs of rating (8W ,220V) How many units of electrical energy will be saved every month (30 days) ??
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GIVEN:
power=100 w=0.1KW
total hours in 30 days = 5*30=150 hrs
energy= power*time
∴E=pxt
0.1*150=15
power for four bulbs = 4*15= 60 kw
If LED bulbs are used then,
By applying same method for LED
power = 8 w
total hours in 30 days = 150 hr
power = 0.008 k/w
energy = power *time
=0.008*150
=1.2
so power for four bulbs = 1.2*4=4.8kw
sow we have to find the energy save so,
=60-4.8=55.2 units
so 55.2 UNITS OF ENERGY IS SAVED EVERY MONTH, IF BULB IS REPLACED BY LED
power=100 w=0.1KW
total hours in 30 days = 5*30=150 hrs
energy= power*time
∴E=pxt
0.1*150=15
power for four bulbs = 4*15= 60 kw
If LED bulbs are used then,
By applying same method for LED
power = 8 w
total hours in 30 days = 150 hr
power = 0.008 k/w
energy = power *time
=0.008*150
=1.2
so power for four bulbs = 1.2*4=4.8kw
sow we have to find the energy save so,
=60-4.8=55.2 units
so 55.2 UNITS OF ENERGY IS SAVED EVERY MONTH, IF BULB IS REPLACED BY LED
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