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Joule (J) and kilowatt-hour (kWh) are units of energy used to measure the amount of work done or the amount of energy consumed or transferred in various processes. Here’s a brief explanation of each:
Joule (J)
The joule is the standard unit of energy in the International System of Units (SI). It is defined as the amount of energy transferred when a force of one newton acts through a distance of one meter in the direction of the force. In simpler terms, a joule is the energy required to perform one unit of work when a force of one newton is applied over a distance of one meter.
Kilowatt-hour (kWh)
The kilowatt-hour is a unit of energy commonly used in the context of electrical power consumption. It is equivalent to the amount of energy consumed by a device with a power of one kilowatt (1 kW) running for one hour. Mathematically, 1 kWh is equal to 3.6 million joules (since 1 kilowatt = 1000 joules per second, and there are 3600 seconds in an hour).
How to convert joules to kWh
1J = 2.777778⋅10-7kWh = (1/3600000)kWh
Conversion formula of Joules to kWh
E(kWh) = E(J) / 3600000 = E(J) ⋅ 2.777778⋅10-7
Joules to kWh conversion table
| Energy (J) | Energy (kWh) |
| 1 J | 0.0000002778 kWh |
| 2 J | 0.0000005556 kWh |
| 3 J | 0.0000008333 kWh |
| 4 J | 0.0000011111 kWh |
| 5 J | 0.0000013889 kWh |
| 6 J | 0.0000016667 kWh |
| 7 J | 0.0000019444 kWh |
| 8 J | 0.0000022222 kWh |
| 9 J | 0.0000025000 kWh |
| 10 J | 0.0000027778 kWh |
| 20 J | 0.0000055556 kWh |
| 30 J | 0.0000083333 kWh |
| 40 J | 0.0000111111 kWh |
| 50 J | 0.0000138889 kWh |
| 60 J | 0.0000166667 kWh |
| 70 J | 0.0000194444 kWh |
| 80 J | 0.0000222222 kWh |
| 90 J | 0.0000250000 kWh |
| 100 J | 0.0000277778 kWh |
| 200 J | 0.0000555556 kWh |
| 300 J | 0.0000833333 kWh |
| 400 J | 0.0001111111 kWh |
| 500 J | 0.0001388889 kWh |
| 600 J | 0.0001666667 kWh |
| 700 J | 0.0001944444 kWh |
| 800 J | 0.0002222222 kWh |
| 900 J | 0.0002500000 kWh |
| 1000 J | 0.0002777778 kWh |
FAQs on Joules to kWh
What is 1 joule equal to in kWh?
1 joule is a tiny amount of energy. It's like the energy you use to lift a small apple a short distance. 1 joule is equal to 0.0000002778 kilowatt-hours (kWh), which is a very, very small amount of electrical energy.
Is 1 kW equal to 1 joule?
No, they're not the same. 1 kilowatt (kW) is a measure of power, which tells you how quickly energy is being used or produced. 1 joule, on the other hand, is a measure of the actual energy itself. It's like the difference between how fast a car is going (power) and how far it's traveled (energy).
How do you calculate joules from kW?
To convert kilowatts (kW) to joules, you need to know how long the power is being used. You multiply the power in kilowatts by the time in seconds. So, Energy (in joules) = Power (in kW) × Time (in seconds).
What is equal to 1 kWh?
1 kilowatt-hour (kWh) is like the energy used when you leave a 100-watt lightbulb on for 10 hours. It's a bigger amount of energy than 1 joule. It's about 3,600,000 joules.
Why is 1 kWh equal to 3600 kJ?
It's because 1 kilowatt-hour (kWh) is about the same as 3,600,000 joules, and 1 kilojoule (kJ) is 1000 joules. So, 3,600,000 joules = 3600 kJ = 1 kWh.
How many kWh is 1 unit?
1 unit of electricity, often seen on your utility bill, is equal to 1 kilowatt-hour (kWh). It's like using a 100-watt bulb for 10 hours.
How many watts is a joule?
A joule doesn't directly measure in watts. Watts tell you how quickly energy is used or produced, while joules measure the actual energy. However, if you're using 1 watt of power for 1 second, you're using 1 joule of energy.
What is the formula of joule?
The formula to calculate energy (in joules) is: Energy = Power (in watts) × Time (in seconds). This tells you how much energy is used when a certain amount of power is used for a specific duration.
