Power, in general, is defined as the rate at which energy is transferred or converted or the rate of doing work. Thus, power can be calculated using the formula P = W / t. On the other hand, power is a scalar quantity and is basically the amount of energy consumed per unit of time which has no direction. While we have already talked about power in our other article, on this page students will find all the information regarding the unit of power.
|Table of Contents|
SI Unit of Power
According to popular standards, the SI unit of power is none other than the watt which is represented by the symbol (W). One joule per second is also equal to one watt. Interestingly, the name was kept in recognition of James Watt, who invented the condenser for the steam engine. He also coined the term horsepower, which is the older unit of power. It can be depicted as;
|1 watt = 1 J/s = 1 kg-m2/s3|
Other Power Units
Some of the common power units include ergs per second (erg/s), foot-pounds per minute, dBm, food calories per hour or kilocalories per hour, horsepower (hp), BTU per hour (BTU/h).
Units Of Power Conversions
|Units||Abbreviation||Equivalent Watt Unit|
|decibel-milliwatts||dBm||30 dBm = 1 W|
|British Thermal Unit/Hour||BTU/hr||3.412142 BTU/hr = 1 w|
|Calories per Second||cal/sec||0.24 calories per second cal/sec = 1 W|
|Unit Of Force||Unit Of Pressure|
The video explains the fundamentals of the concept of Power
Frequently Asked Questions – FAQs
What is power?
What is the formula to calculate power?
P = W / t
What is the SI unit of power?
State true or false: One joule per second is also equal to one watt.
Name three power units.
Watch the video and learn more about circular motion, work, power & energy
Stay tuned with BYJU’S for more such interesting articles. Also, register to “BYJU’S – The Learning App” for loads of interactive, engaging Physics-related videos and unlimited academic assistance.
Put your understanding of this concept to test by answering a few MCQs. Click ‘Start Quiz’ to begin!
Select the correct answer and click on the “Finish” button
Check your score and answers at the end of the quiz
Visit BYJU’S for all Physics related queries and study materials
Your result is as below