Power isn't energy. The difference matters more than you may know. | Technology Connections
Power isn't energy. The difference matters more than you may know. | Technology Connections
9 comments
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The concept of Watt-hours was messing me up. I think I get it now.
- Energy is the potential to do some work, measured in Joules.
- Power is the rate at which work is done and is measured in Joules per seconds, i.e., Watts.
- If you want to know how much energy something "uses", multiply it's power by how long it has been running.
- e.g., something with a power of 100 J/s (i.e., 100 Watts) running for 10 s will use 1,000 Joules of energy.
- For household use, Joules is not a very convenient unit, so we use Watt-hours (W•h) or kW•h, which is the number of Watts an appliance uses times the number of hours it runs. Watt-hours and Joules are both units of energy.
- Watt-hours is not Watts-per-hour, i.e., it is not a rate. It means Watts-times-hours. If we break it down, we can convert back to Joules:
W•h = (3600s•J) / s = 3600J.
- Watt-hours is not Watts-per-hour, i.e., it is not a rate. It means Watts-times-hours. If we break it down, we can convert back to Joules:
I hope I summarized it properly and didn't make any math mistakes!
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I love that guy , he is so interesting to watch and his video on "colour" brown is my most rewatched video of his ... the passion he has while talking about the most mundane stuff in our world is the best attention keeper imo
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God forbid Alec get paid for his work.
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With the prevalence of adblockers on here, Patreon seems like a better option than the little money he would get from 1 view on YouTube.
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Power = Energy ÷ time, and conversely, Energy = Power × time. Even though in English, people use the two colloquially.
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So what is power/time? (ie:watt-hour)
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Notice the absence of division. It's not watts per hour, but watt(s times)hours. So power multiplied by time which is energy. Just like the video explains.
Watts are analogous to velocity, so if you were to divide watts by time, the result would be the increase of power i.e. acceleration of energy consumption.
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9 comments