Difference between revisions of "Electrical Power"
(Created page with "==Key Stage 4== ===Meaning=== '''Electrical power''' is the rate of electrical energy transfer in an component. ===Abo...") |
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===About Electrical Power=== | ===About Electrical Power=== | ||
| − | : | + | : The [[SI Unit]]s of '''electrical power''' are [[Watt]]s. |
| + | : '''Electrical power''' is the [[Work Done|work done]] by an [[Electrical Current|electrical current]] per unit [[time]]. | ||
| + | |||
| + | ===Equations=== | ||
| + | ====Equation 1==== | ||
| + | ''NB: You must remember this equation.'' | ||
| + | |||
| + | '''Power''' = (Energy Transferred)/(time) | ||
| + | |||
| + | <math>P=\frac{E}{t}</math> | ||
| + | |||
| + | Where: | ||
| + | |||
| + | <math>P</math> = '''Electrical Power'''. | ||
| + | |||
| + | <math>E</math> = [[Electrical Energy Transfer]]red or [[Work Done]] by an [[Electrical Current|electrical current]]. | ||
| + | |||
| + | <math>t</math> = The [[time]] over which [[energy]] is [[Energy Transfer|transferred]]. | ||
| + | |||
| + | ====Equation 2==== | ||
| + | ''NB: You must remember this equation.'' | ||
| + | |||
| + | '''Power''' = (Current) x (Potential Difference) | ||
| + | |||
| + | <math>P=IV</math> | ||
| + | |||
| + | Where: | ||
| + | |||
| + | <math>P</math> = '''Electrical Power'''. | ||
| + | |||
| + | <math>I</math> = [[Electrical Current]] through a [[Electrical Component|component]]. | ||
| + | |||
| + | <math>V</math> = [[Potential Difference]] across the [[Electrical Component|component]]. | ||
| + | |||
| + | ====Equation 3==== | ||
| + | ''NB: You must remember this equation.'' | ||
| + | |||
| + | '''Power''' = (Current)<sup>2</sup> x (Resistance) | ||
| + | |||
| + | <math>P=I^2R</math> | ||
| + | |||
| + | Where: | ||
| + | |||
| + | <math>P</math> = '''Electrical Power'''. | ||
| + | |||
| + | <math>I</math> = [[Electrical Current]] through a [[Electrical Component|component]]. | ||
| + | |||
| + | <math>R</math> = The [[Electrical Resistance|resistance]] of the [[Electrical Component|component]]. | ||
| + | |||
| + | ====Equation 4==== | ||
| + | ''NB: You must remember this equation.'' | ||
| + | |||
| + | '''Power''' = (Current) x (Potential Difference) | ||
| + | |||
| + | <math>P=\frac{V^2}{R}</math> | ||
| + | |||
| + | Where: | ||
| + | |||
| + | <math>P</math> = '''Electrical Power'''. | ||
| + | |||
| + | <math>V</math> = [[Potential Difference]] across the [[Electrical Component|component]]. | ||
| + | |||
| + | <math>R</math> = The [[Electrical Resistance|resistance]] of the [[Electrical Component|component]]. | ||
Revision as of 19:57, 2 March 2019
Contents
Key Stage 4
Meaning
Electrical power is the rate of electrical energy transfer in an component.
About Electrical Power
- The SI Units of electrical power are Watts.
- Electrical power is the work done by an electrical current per unit time.
Equations
Equation 1
NB: You must remember this equation.
Power = (Energy Transferred)/(time)
\(P=\frac{E}{t}\)
Where\[P\] = Electrical Power.
\(E\) = Electrical Energy Transferred or Work Done by an electrical current.
\(t\) = The time over which energy is transferred.
Equation 2
NB: You must remember this equation.
Power = (Current) x (Potential Difference)
\(P=IV\)
Where\[P\] = Electrical Power.
\(I\) = Electrical Current through a component.
\(V\) = Potential Difference across the component.
Equation 3
NB: You must remember this equation.
Power = (Current)2 x (Resistance)
\(P=I^2R\)
Where\[P\] = Electrical Power.
\(I\) = Electrical Current through a component.
\(R\) = The resistance of the component.
Equation 4
NB: You must remember this equation.
Power = (Current) x (Potential Difference)
\(P=\frac{V^2}{R}\)
Where\[P\] = Electrical Power.
\(V\) = Potential Difference across the component.
\(R\) = The resistance of the component.