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If you run a 500 W computer for 4 hours, your electric meter will read ____; this is a measure of _______ “used” A) 2000 kWh, e
Question
If you run a 500 W computer for 4 hours, your electric meter will read ____; this is a measure of _______ “used”
A) 2000 kWh, energy
B) 2000 kWh, power
C) 2 kWh, current
D) 2 kWh, energy
E) 2 kWh, voltage
F) 2000 kWh, current
G) 2000 kWh, voltage
H) 2 kWh, power
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Physics
3 years
2021-08-11T11:46:36+00:00
2021-08-11T11:46:36+00:00 2 Answers
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Answer:
D) 2 kWh, energy
Explanation:
Energy = power×time
For electricity,
E = Pt……………….. Equation 1
Where E = Electric Energy, P = power, t = time.
Given: P = 500 W, t = 4 hours.
Substitute into equation 1
E = 500(4)
E = 2000 Wh
E = (2000/1000) kWh
E = 2 kWh.
Hence the right option is D) 2 kWh, energy
Answer:
If you run a 500 W computer for 4 hours, your electric meter will read 2kWh; this is a measure of energy “used”. The correct answer is D.
Explanation: Energy is defined as the capacity of doing work and is occurs in different forms( electrical, kinetic, potential energy). Electrical energy consumption can be calculated or measure through the multiplication of the power( W or kW) used by the number of hours during which the power is consumed. Therefore the unit of energy is kWh. From the question,
500W was used for 4 H
Therefore energy consumed
500× 4= 2000Wh. To convert to kWh
Divide by 1000,
2000÷ 1000= 2.
There energy consumed in kWh is,
2kWh energy.