if your computer uses 2.5A at 120V, how much will it cost to use the computer for 4 hours a day, seven days a week for two weeks? assume that the cost of electricity is $0.09 for every kWh*h of energy.
i solved it like this way could you check of i got it right plzzz??
(C= E* Charge)
to find energy E= P*t
to find power P=V*I
P=120V*2.5A=300W
NOW BACK TO FIND ENERGY
E=300W*56h(cuz 4*14)=16800W*h=16.8kW*h
C=16.8kW*h * 0,09=$1.512
therefore, it will cost $1.512
is this right??
Yes, your calculations are correct, and your final answer of $1.512 is accurate. You have correctly used the formulas to find the energy consumed and the power usage of the computer. Here's a step-by-step guide to solving the problem:
1. Start with the given information: The computer uses 2.5A at 120V.
2. Calculate the power usage using the formula P = V * I. In this case, P = 120V * 2.5A, which gives us 300W (watts).
3. Determine the energy consumed by multiplying the power by the time: E = P * t. Since the computer is used for 4 hours a day, seven days a week for two weeks, the total time is 4 hours/day * 7 days/week * 2 weeks = 56 hours. So, E = 300W * 56h = 16800Wh (watt-hours) or 16.8kWh (kilowatt-hours).
4. Calculate the cost of electricity by multiplying the energy consumption by the cost per kilowatt-hour: C = E * Charge. The given cost is $0.09 for every kWh*h (kilowatt-hour). Thus, C = 16.8kWh * $0.09 = $1.512.
5. Therefore, the cost to use the computer for 4 hours a day, seven days a week for two weeks will be $1.512.
Well done on solving the problem correctly!