An electric bulb of 40 W glows for 10 hours a day. What is the amount to be paid in the month of 30 days if 1 unit of electricity cost Rs. 2.50?

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Solution

Power = 40 W
Time $= 10 h \times 30 d a y s = 300 h r s$
Units of energy $= P o w e r \times T i m e = 40 W \times 300 h r$
$= 12000 W h r = (\frac{12000}{1000}) k W h r = 12 u n i t s$
Cost for one unit of electricity = Rs. 2.50
Cost for 12 units of electricity $= 12 \times 2.50 = R s . 30$

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An electric bulb of 40 W glows for 10 hours a day. What is the amount to be paid in the month of 30 days if 1 unit of electricity cost Rs. 2.50?

Power = 40 W Time =10h×30 days=300 hrs Units of energy =Power×Time=40 W× 300 hr =12000 Whr=(120001000) kWhr=12 units Cost for one unit of electricity = Rs. 2.50 Cost for 12 units of electricity =12×2.50=Rs. 30

Power = 40 W
Time $= 10 h \times 30 d a y s = 300 h r s$
Units of energy $= P o w e r \times T i m e = 40 W \times 300 h r$
$= 12000 W h r = (\frac{12000}{1000}) k W h r = 12 u n i t s$
Cost for one unit of electricity = Rs. 2.50
Cost for 12 units of electricity $= 12 \times 2.50 = R s . 30$