9. A bulb is rated at 200 V - 100 W. what is its resistance? Five such bulbs burns for 4 hours.
What is the electrical energy consumed? Calculate the cost if the rate is Rs 7.50 pert unit?
Answers
Answered by
0
answer
v=200v
p=100watt
t=4hours
power=square of voltage/ resistance
100w=200v*200v/R
R=40000v/100w
R=400ohm
energy consumed by one bulb...
Energy=power*time
E=100/1000*4(divide by 1000 to convert it into kilowatt)
E=0.4kwh
for 5bulb =0.4*5
Energy consumed by 5 bulb is 2kwh
the cost of energy consumed is Rs7.50*2kwh
total cost=15Rs
Answered by
0
Using, P = V²R
we get R = V²P
= (200)²100
= 400
Energy consumed = P x t
= 100 x 4
= 400 Wh
= 0.4 kWh
Cost at the rate of 7.5 paise per unit
= Rs (7.5 x 0.4)
= Rs 3
HOPE IT HELPS
PLEASE MARK ME BRAINLIEST ☺️
Similar questions