Question

electric toaster draws a current of 8 ampere in a circuit with the source of voltage 220 volt it is used for 2 hours find the cost of operating a toaster if the cost of electrical energy is rupees 4.50 per kwh​

Answer 1

Answer:

cost of electrical energy is Rs. 15.58

Answer 2

Given :

Current drawn , I = 8 A .

Source voltage , V = 220 V .

Time of operation , t = 2 hr .

Cost of electrical energy is rupees c = 4.50 per kwh​ .

To Find :

The cost of operating a toaster .

Solution :

We know , power is given by :

$P=IV\\\\P=8\times 220\\\\P=1760\ W\\\\P=1.76\ kW$

So , total power in 2 hours is :

$P=1.76\times 2 \ kW\ hr\\\\P=3.52\ kW\ hr$

So , Total cost :

$C=P\times c\\\\C=3.52\times 4.5\ Rs\\\\C=15.84\ Rs$

Hence , this is the required solution .

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Power and energy

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