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- Power calculation is the process of finding the amount of energy transferred per unit of time123.Examples of power calculation include123:
- Finding the power of a kettle that has a power rating of 2200 watts and is used for 80 seconds. The power is equal to the work done divided by the time, which is 2200 x 80 = 176000 joules13.
- Finding the power of a lamp that has a voltage of 120 volts and a resistance of 13.3 ohms. The power is equal to the voltage multiplied by the current, which is 120 x (120 / 13.3) = 108 watts2.
- Finding the power of an iron that is used for five minutes and transfers 600,000 joules of energy. The power is equal to the work done divided by the time, which is 600,000 / (5 x 60) = 2000 watts3.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.[& [power = frac {work~done} {time}] [power = frac {W} {t}]&] This is when: power (P) is measured in watts (W) work done (W) is measured in joules (J) time (t) is measured in seconds (s) One watt is equal to one joule per second (J/s). This means that for every extra joule that is transferred per second, the power increases by one watt.www.bbc.co.uk/bitesize/guides/zp8jtv4/revision/2Using Ohm’s Law to determine current, we get: Now that we know the current, we can take that value and multiply it by the voltage to determine power: This tells us that the lamp is dissipating (releasing) 108 watts of power, most likely in the form of both light and heat.www.allaboutcircuits.com/textbook/direct-current/c…Electrical Energy Calculations
- 1. A kettle has a power rating of 2200 watts and is used for 80 seconds. Calculate the total energy transferred.
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