What's the difference between a kW and a kWh?

What is a kilowatt? What is a kilowatt-hour? What is a megawatt? What's the difference between power and energy?

[waterinstinct]

You are awesome! I was so confused by those two units. But you sir explained it perfectly. Thank you very much! :-)

[annieway]

Very smart boy 💡. I only needed info on kwh but he went nuts and explained everything lol

[zeesworld]

Excellent video. Love the analogies and illustrations. I watched many videos on this topics. Yours is the first one that finally it got to sink into the brain. Thank you.

[cranmore]

you straightened me out! that is amazing. thanks a lot

[estspartans]

This was the best video I've watched on this!

[brownmc]

Very clear, well explained, many thanks.

[MarkHN-jjik]

Energy and power are closely related but are not the same physical quantity. Energy is the ability to cause change; power is the rate energy is moved, or used.

[GitteRobertson]

Thanks for explaining, I needed that! 

[glasnikov]

I am as confused as apparently many commentators here. But this explanation made sense to me. So if we have a light bulb of 100 W or a generator of say 30 Megawatts they don't produce or consume anything in terms of watt hours. It is only when they are used an hour or any other time period they can be then measured in terms of that time period. So they have a potential for what ever that is, 100W or 30MW and it just depends on how much time you run it that you get the watt hours.

[mskraemerartclass]

practical help: what is a difference between these two companies 1. Each block is equivalent to 50 kilowatt hours (kWh) of electricity and is available for $4.92 net cost per month. So when you subscribe to two blocks, you’re supporting 100 kWh of solar energy for only $9.84 per month or just 33 cents per day.versus Versus 2. The initial credit rate on your bill will be approximately $0.04 per kilowatt-hour (kWh) and will remain at that level for the first 36 months. Starting with the 37th month of continuous enrollment, the rate will increase 1.5% annually; A 1kw subscription to solar energy will cost less than $8.35 a month** Please help what is the difference between these two offers?

[thomasho]

Excellent class! I have learnt a lot, thank you.

[arch_engineer]

Good explanation. I think it also helps to explain that a watt is equal to a joule per second

[Peter]

Genius video. I’m so impressed with the weightlifting analogy and what a great orange shirt.

[Ramboisme]

good job, basically
1W = 1 j/s

1Wh = 1 j/s * 1h

1h = 3600 seconds

1Wh = 1 j/s * 3600s

1Wh = 3600 j

1kWh = 3, 600, 000 j

[keycapslapper]

Why not just use Joules for energy consumption? Since Watts = Joules/second, why complicate it and add hours into the mix?

[kylesimmons]

This was very helpful. Well explained. Thank you!

[rockychan]

thanks, you've saved my life in the physics examination xD

[cindicita]

Excellent video! very clear information. Thank you so much!

[andystitt]

Does the hour have to be a straight hour?

[tmaloney]

this wouldn't be such a hassle if we hadn't invented the commercial unit of energy called the kilowatt-hour. What does "hour" have to do with diddly? Oh yeah, it's 3600 seconds. Why 3600? Because 60 x 60, of course. Why 60? Uhhh, I don't know. Geez, guys and gals, just express yourselves in joules.