if an electric bulb has a rating 200w-220V and if it is used for 5 hours daily for 10 days. calculate the cost of using the bulbs at 40 paise per unit.

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Solution

Dear Student ,
$T h e \cos t i s 40 p a i s e p e r K W h . T h e b u l b i s i n u s e f o r = 10 \times 5 = 50 h . U n i t s o f e l e c t r i c i t y c o n s u m e d b y t h e b u l b i s = 200 \times 50 = 10000 W h = 10 K w h . S o t h e t o t a l \cos t i s = 10 \times 40 = 400 p a i s e = R s 4 T o t a l \cos t d u e t o t h e b u l b i s R s 4 .$
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if an electric bulb has a rating 200w-220V and if it is used for 5 hours daily for 10 days. calculate the cost of using the bulbs at 40 paise per unit.

Dear Student , The cost is 40 paise per KW h. The bulb is in use for =10×5=50 h. Units of electricity consumed by the bulb is =200×50=10000 W h=10 Kwh. So the total cost is = 10×40=400 paise=Rs 4 Total cost due to the bulb is Rs 4. Regards