# Struggling with A.P Physics Question on kWh to Joules Conversion

• rmarkatos
In summary, the conversation is about an A.P Physics class that does not use calculus and a problem with converting kilowatt x hour to joules. The suggested solution involves using the definition of power and unit conversions. The final answer is 3.6E6 joules.
rmarkatos
This is an A.P Physics class which is algebra based and does not use calculus. This problem is really annoying because it is one of the easier questions from the homework but i can't seem to understand the procedure.

One kilowatt x hour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied for a times of one hour. Determine the number of joules of energy in one kilowatt x hour.

Any suggestions?

This question is just asking you to do a simple unit conversion using the definition of power. As you know from the problem, kiloWatt*Hour is an unit of Energy and you have to convert this unit into Joules.

So you have
kiloWatt*Hour = 1000*Watt*Hour = 1000*Watt*(3600 Second)

Now you know that Watt = Joules/Second

Then you get
1000*Watt*(3600 Second) = 1000*(Joules/Second)*(3600 Second) = 3.6E6 Joules (in scientific notation).

Thank you Swapnil

## 1. How do I convert from kilowatt-hours (kWh) to joules?

To convert from kilowatt-hours (kWh) to joules, you can use the conversion factor of 1 kWh = 3,600,000 joules. This means that to convert from kWh to joules, you simply need to multiply the value in kWh by 3,600,000. For example, if you have 5 kWh, the conversion would be 5 kWh x 3,600,000 = 18,000,000 joules.

## 2. What is the difference between kilowatt-hours (kWh) and joules?

Kilowatt-hours (kWh) and joules are both units of energy, but they measure different amounts. Kilowatt-hours are a measure of how much energy is used over time, while joules are a measure of energy at a specific point in time. 1 kWh is equal to 3,600,000 joules.

## 3. Can I use a calculator to convert from kWh to joules?

Yes, you can use a calculator to convert from kWh to joules. Simply enter the value in kWh and multiply it by 3,600,000 to get the equivalent value in joules.

## 4. Why do we need to convert from kWh to joules?

Converting from kWh to joules can be useful in various scientific and engineering calculations. For example, if you are studying the energy usage of a household or a city, you may need to convert from kWh to joules to get a more accurate understanding of the energy being used.

## 5. Is it possible to convert from joules to kilowatt-hours (kWh)?

Yes, it is possible to convert from joules to kilowatt-hours (kWh). You can use the conversion factor of 1 kWh = 3,600,000 joules. This means that to convert from joules to kWh, you need to divide the value in joules by 3,600,000. For example, if you have 10,000,000 joules, the conversion would be 10,000,000 joules / 3,600,000 = 2.78 kWh.

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