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Electricity Revision (Resistance (R=V/I, R=pL/A, Resistance is a measure…
Electricity Revision
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I-V Characteristics
I-V Characteristics describe how a components V/I ratio changes with changes in current, voltage or even temperature
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P.D and EMF
EMF is the theoretical voltage of a power source. You can find the emf of a power source by setting the current to zero so that the resistance is infinite
Internal Resistance
Power sources with high internal resistance will have more lost volts and hence a bigger difference between the terminal p.d and the emf.
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P.D is the energy dissipated by a component. Energy can be dissipated as light, heat, sound and other forms of energy
Some Useful Equations
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I = nevA
Remember that little 'v' is the velocity of electrons, not voltage!
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