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CBSE Class 10 Answered

a) An electric bulb is rated 220v and 100w what is its resistance? b) calculate the energy consumed by 3 such bulbs if they glow continuously for 10 hours for complete month of november. c)calculate the total cost of the rate at 6.50 per unit. 
Asked by ohilubana006 | 06 Feb, 2021, 08:54: PM
answered-by-expert Expert Answer
Power = 100 W
 
Voltage = 220 V
 
Current = ( 100 / 220 ) = 0.454 A
 
Resistance = Voltage / current = 220 /0.454 = 484 Ω
------------------------
 
Energy consumed by 3 bulbs for 10 hours = 3 × 100 W × 10 hr = 3000 W-hr = 3 kWhr
 
Energy consumed by 3 bulbs for 10 hours daily in Novemeber =  3 kWhr × 30 = 90 kWhr
 
Cost of electrical energy = 90 × Rs.6.50 = Rs.585
Answered by Thiyagarajan K | 06 Feb, 2021, 10:20: PM

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