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Chapter 7: Q4Q (page 316)

Electricity is billed in kilowatt-hours. Is this energy or power? How much is one kilowatt-hour in standard physics units? (The typical cost of one kilowatt-hour is 5 to 10 cents.)

Short Answer

Expert verified

One kilowatt-hour in standard physics units is 3.6×106J.

Step by step solution

01

Definition of one kilowatt-hour

1KWh is the unit of energy which is equivalent to the energy transferred or expended in one hour by one kilowatt of power.

02

Finding the energy

Kilowatt-hours is considered as energy, it can be expressed asE=P×Twhere, P is power and T is time.

When watts are multiplied by seconds, 1 kilowatt-hour can be translated to Joules in normal physics units. It can be stated as follows:

E=1kWh1000W1kWh60min1hr60s1min=3.6×106J

Therefore, one kilowatt-hour in standard physics units is role="math" localid="1657787522533" 3.6×106J.

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Most popular questions from this chapter

Niagara Falls is about 50m high. What is the temperature rise in kelvins of the water from just before to just after it hits the rocks at the bottom of the falls, assuming negligible air resistance during the fall and that the water doesn't rebound but just splats onto the rock? It is helpful (but not essential) to consider a 1g drop of water.

You place into an insulated container a 1.5 kg block of aluminium at a temperature of 45°C in contact with a 2.1 kg block of copper at a temperature of 18°C. The specific heat of aluminium is 0.91 J/g and the specific heat of copper is 0.39 J/g. What is the final temperature of the two blocks?

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Question: In the Niagara Falls hydroelectric generating plant, the energy of falling water is converted into electricity. The height of the falls is about 50m. Assuming that the energy conversion is highly efficient, approximately how much energy is obtained from one kilogram of falling water? Therefore, approximately how many kilograms of water must go through the generators every second to produce a megawatt of power 1 X 106W?
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