Question

An electric toaster is plugged into the wall outlet that produces a voltage of 120 Volts. If the heating element in the toaster has a resistance of 20 Ohms, then what is the current through the toaster in Amperes? Round to two significant digits (one decimal). *

Answer 1

Answer:

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Explanation:

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An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 hr. What is the cost of operating the toaster if the cost of electrical energy is Rs. 4.5/kWh?

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Solution

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Correct option is

D

Rs. 15.84

Given,

i=8 A

E=220 v

t=2 hr

Energy dissipated is given by:

E=E i t

=220×8×2 Wh

=3.52 kWh

The cost per kWh is Rs. 4.50

Hence, the cost of running the kettle for two hours is:

3.52×4.50=Rs. 15.84