Electric Power

Power is the rate in which work is done, much like kilometers (or miles) per hour is a rate. The SI unit for power is the Watt, and it’s defined as one joule per second. Whether it takes you three seconds or one second to move 100kg to 1m above the ground, you use the same amount of energy. However, it requires more power to do it in one second.

When it comes to electric power, “work done” refers to the ability of the circuit to transform electrical energy into something else, like heat, motion or sound. “Work done” can also refer to transforming some other form of energy into electrical energy, as in a battery, which converts chemical energy to electrical energy.

As power is work done per unit time, with a little bit of math we find that electric power is defined as voltage times current: P = V x I.

The information in the video was inspired by the following tutorials:

[philhutchinson]

Outstanding explanations and demonstrations of the concept! This series has been fantastic.

[wjf]

I like the little history that goes along with this, like the horse power rating. Back then when someone invented something, they needed a way to relate it to the end user and that was a farmer. He needed to know that a steam engine could do the same work as "X" amount of horses.

The same is true for air conditioning units and why they are rated with the "TON" rating. Back then, AC was invented to make ice and those who sold ice, sold it by the pound. So they needed to know how much water could be frozen into ice in a 24 hour period, and the ton rating was born. They knew 250 gallons of water was a ton, and that made 50 of the average 40 pound blocks of ice that were sold for ice boxes. Now they did not have to cut ice from a lake in the winter time and save it in saw dust over the spring and summer. They just made ice and all they wanted with AC.

Now all larger AC units are rated in TON. Some smaller units are rated in BTU's, but there are 12, 000 BTU's per ton and 3.4 BTU's per watt. So it's easy to figure "BASIC" power needs and what can be expected from certain sized units and what to look for when most homes need one ton per 350sf of living area, give or take. I'm really enjoying these videos. Keep up the great work.

[nellunell]

I never subscribe a channel because video maker keep asking it with ads, so I decided to subscribe your. mr.clark

[sajithasaleem]

ur videos are so usefulll.Keep up the good work!!!😄😄

[praneetbanerjee]

Your videos are so interesting and so informative

[benlee]

Puzzle: I personally feel that it takes more effort to lift a dumbbell slowly. Just like doing chin ups. if you pull up slowly and let go slowly, it is more difficult?

[sushilkumarray]

Hi David Warner you are now back on youtube the name of this person is David Warner(Australian cricketer)

[wolffang]

I love your videos please keep up the good work!

[zaprodk]

Good video, but i'm sad to see that the infrared thermometer is used incorrectly. It should be held close to the resistor and pointed to a matt black spot in it to measure correct.

[sharpzon]

omg where can I get those mini lightbulbs??

[willybee]

good job, , keep up the good work. ...

[eigentlichtoll]

mark wahlberg doing science stuff. that's cool!

[ufohunter]

What would happen if I were to smash 2 electrons together so hard and fast, that they can't repel each other? What would be the result of this collision?
With that thought in mind, What would happen if I was able to capture a ball lightning inside a spherical magnetic filed and just keep squeezing the electrons together!
Would I not get free heat for eternity?

[madhusudhanand]

sir more video related to electrical and electronics engineering

[Fridgemusa]

This guy looks like Mark Wahlberg's nerdy long lost cousin :P