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A bulb is rated at 200V -40W. What is its resistantt ? 5 such bulbs are lighted for 5 hours. Calculatethe electrical energy consumed ? Find the cost if the rate is 5.10 per KWh.

Answer»

SOLUTION :V = 200 V,P = 40 W
P =VI
`I=(P)/(V) =(40)/(200) = (1)/(5)` A
`R= (V)/(I) = (20)/((1)/(5))`
`=200xx5=1000 Omega`
Total power `=40Wxx5=200W`
Time =5 hrs
ELECTRICAL energy `= 200 Wxx5 hrs`
=1000 Wh
= 1 KWh.
Cost of 1 Kwh = 5.10 RS.


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