Question

An electric heater of 1000 W for 3 hours daily in a day.Calculate the electrical energy consumed

Answer 1

Answer:

Given :

Power of electric heater , P = 1000 W = 1 kW .

Hourly used per day , h=3 \ hrh=3 hr .

Number of days it used , n = 25 .

Cost per unit , c = 4 Rs .

To Find :

The cost of using it for a month of 25 days .

Solution :

Daily consumption , d=1\times 3= 3\ kW. hd=1×3=3 kW.h

So , monthly consumption ,

\begin{gathered}D=d\times 25\\D=3\times 25=75\ kW.h\end{gathered}

D=d×25

D=3×25=75 kW.h

Therefore , cost per month is :

\begin{gathered}C=D\times 4\\C=75\times 4\ Rs\\C=300\ Rs\end{gathered}

C=D×4

C=75×4 Rs

C=300 Rs

So , the cost of using it for a month of 25 days is 300 Rs .

Thank :)