Question

1. An electric toaster has a power rating of 110 W. It operates for 2 hour in
the morning and 1 hour in the evening. How much does it cost to operate
the toaster for 15 days at Rs 7 per KW h?​

Answer 1

Given:

An electric toaster has a power rating of 110 W. It operates for 2 hour in the morning and 1 hour in the evening.

To find:

Total cost @ Rs 7 per KWh

Calculation:

Total time for which the toaster is operated everyday = 2 + 1 = 3 hours.

So, total energy consumed everyday:

$\rm{E = 110 \times 3 = 330 \: watt \: hr}$

So, Total energy consumed in 15 days :

$\rm{E \: net= 330 \times 15 = 4950 \: watt \: hr}$

$= > \rm{E \: net= 4.95\: kilowatt \: hr}$

So, total cost :

$\boxed{ \rm{cost = 4.95 \times 7 = 34.65 \: rupees}}$

So, final answer is:

Cost of operating toaster for 15 days is 34.65 rupees.

Answer 2

GiveN :-

• An Electric Toaster has a power Rating = 110 Watt.

• It operates for 2 hour in Morning and 1 one hour in the Evening.

• Per Kwh it is ₹ 7

To FinD :-

• Rate of the Toaster operated for 15 days. @₹7

SoluTioN :-

It is said that The Toaster work's for 2 hour in the Morning and 1 hour in the Evening every day.

Total Working Hours a day = 1 + 2 = 3

Total Energy Consumed In a day

$★E= 110 \times 3 = 330 \: whr$

In a Day the Toaster Consumed 330 Watt hr energy So, in 15 days the Toaster Consumes

$330 \times 15 = 4950Whr$

The Bulk Unit of Watt = Kwh

Dividing 1000 to convert W to KW

$\bold{ \pink{★E = 4.95kwh}{} }{}$

Now The Total Charge Coast In 15 days @ ₹7 per Kwh

$\bold{ \red{★Coast = 4.95 \times 7 = ₹34.65}{} }{}$

Hence Coast in 15 days for the toaster = ₹34.65