Practical circuits

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  • Created by: Sevdeg
  • Created on: 12-05-14 16:42
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  • Practical circuits
    • All sources of e.m.f have an internal resistance. This may be due to the wires for a power supply whereas for a cell its due to the chemicals within it.
    • The reason for the heating effect in batteries is that some of the electrical potential energy of the charges is transformed to internal energy.
    • E=I (R+r)
    • V= E-Ir
    • Internal resistance can be found from a graph of V against I.


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