WebElectric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, ... however, the simple equation P = IV may be replaced by a more complex calculation. The closed surface integral of the cross-product of the electric field intensity and magnetic field intensity vectors gives the ... WebDec 22, 2024 · The expression for mechanical power uses the same basic formula as all types of power: P = W / t where P is power in watts, W is work in joules and t is time in seconds. ... In advanced physics, sophisticated forms of the mechanical power equation may require the use of calculus and longer, more complicated formulas that take into …

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WebThe power output of electrical equipment such as light bulbs or stereos is typically advertised in watts. By definition, one watt is equal to one joule of work done per second. So if P P P P represents power in watts, Δ E … WebQuestions. A hair dryer has a power rating of \ (920 W\). It is operated from the mains supply. (You should know that the mains supply is \ (230 V\)). Work out the answers to the following questions. WebCalculating power. The equation used to calculate the power is: \[power = \frac {work \\ done}{time \\ taken}\] ... Two electric motors are used to lift a 2 N weight through a … how to make hidden rows excel