Difference between revisions of "Electrical Power"
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<math>t</math> = The [[time]] over which [[energy]] is [[Energy Transfer|transferred]]. | <math>t</math> = The [[time]] over which [[energy]] is [[Energy Transfer|transferred]]. | ||
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''NB: You must remember this equation.'' | ''NB: You must remember this equation.'' | ||
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<math>V</math> = [[Potential Difference]] across the [[Electrical Component|component]]. | <math>V</math> = [[Potential Difference]] across the [[Electrical Component|component]]. | ||
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''NB: You must remember this equation.'' | ''NB: You must remember this equation.'' | ||
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<math>R</math> = The [[Electrical Resistance|resistance]] of the [[Electrical Component|component]]. | <math>R</math> = The [[Electrical Resistance|resistance]] of the [[Electrical Component|component]]. | ||
| − | ==== | + | ====Power Potential Difference and Resistance==== |
''NB: You must remember this equation.'' | ''NB: You must remember this equation.'' | ||
Revision as of 20:33, 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
Power, Energy Transferred and Time
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.
Power, Current and Potential Difference
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.
Power, Current and Resistance
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.
Power Potential Difference and Resistance
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.