Q.

A room has two tube lights, a fan and a TV. Each tube light draws 40 W, the fan draws 80 W and the TV draws 60 W. On the average, the tube lights are kept on for five hours, the fan for twelve hours and TV for eight hours every day. The rate for electrical energy is Rs. 3)10 per KWH. Calculate the cost of electricity used in this room in a 30 day month.

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

a

Rs.17112

b

Rs.16112

c

Rs.175

d

Rs.161

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

The energy consumed by :
(i) Tube lights =2×10×5×30=12000Wh
(ii) Fan =1×80×12×30=28800Wh
(iii) TV =1×60×8×30=14400Wh
Total = 55200Wh
Total no of units = 55.2 kWh
Total cost = 55.2 x 3.10
=171.12

Watch 3-min video & get full concept clarity

tricks from toppers of Infinity Learn

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon