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प्रश्न
An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.
उत्तर
I = 8 A
V = 220 V
Power = P = VI
P = 220 × 8W
= `[(220 xx 8)/1000] xx 2` kWh
Energy consumed in 2hrs
Cost of electrical energy = `[(1760 xx 2)/1000] xx 4.50`
= ₹ 15.84
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