An electric bulb is rated 220V-100W. What is resistance of bulb? Three such bulbs are running for 4hr . What is energy consumed? Calculate the cost of running these appliance if per unit cost is rs 2.80.
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soln-P=v^2/R power is 100 watt voltage is 200 Volta 100=200^2/r
R=40000/100
R=400 ohms
bobbygondane110:
But what is energy consumed
electrical energy consumed e=p×t p=100 wats 100/1000 = 0.1 kilowatt t=4hours energy consumed by one bulb =0.1×4=0.4 kilowatt hours for five bulbs 0.4×5=2 kilowatt hours
cost of energy 2.80×2=5.60
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