c) Calculate how much energy a colour television that has power rateing of 0.120 kW.h uses in one week if it operates 9 h per day.
Data:Equation:
Electrical energy used = ? kW.hE= P x∆t
Time interval = 9h x 7 = 63 hE= 0.120 kW x 63h
Power = 0.120 kWE= 7.56 kW.h
The electrical energy the television is using in one week is 7.56 kWh.
Colour Television used 7.56 kWh
Cost = elcectrical energy ( kW.h) x rate ( cost per kW.h)
Cost = 7.56 kW.h x 0.08 per kW.h
Cost = $0.60
The cost to operate the television for 7.56 kWh is $0.60.
Is this correct... Seems to me that 60 cents for 9 hours of tv per day is a very small amount. Thats why I thought I was doing something wrong?
2007-03-06 04:34:26 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
yes
2007-03-06 04:41:04 · answer #1 · answered by Saagar M 1 · 0⤊ 0⤋
Your work is correct. Think about it logically, it's only 8 cents for every kWh and the power comsumption of the TV is only 0.120 kWh, or about 1 kWh every 9 to 10 hours. Those are some small numbers, even after a week of 9 hour days, you haven't used that much, only 7.56 kWh.
2007-03-06 04:52:15 · answer #2 · answered by Mike J 3 · 0⤊ 0⤋
You are correct in your calculations.
The number seems right, to me (but I am used to thinking about things like this problem, regularly).
.
2007-03-06 04:41:05 · answer #3 · answered by tlbs101 7 · 0⤊ 0⤋
You are correct.
You're not trusting your math.
A TV really doesn't use that much power, comparatively.
2007-03-06 04:55:51 · answer #4 · answered by tmlamora1 4 · 0⤊ 0⤋