Internal resistance is due to opposition to flow of charge through the source.
Electromotive force (emf) is the electrical energy per unit charge produced by source. If electrical energy E is given to charge Q in the source,
=E/Q
Internal resistance of a source is the loss of pd per unit current in source when current passes through the source.
Cell of emf
, internal resistance r, connected to external resistor resistance R, then
=IR +Ir
Power supplied by cell, I
=I^2 R + I^2 r
Maximum power is delivered to the load when the load resistance is equal to internal resistance of source (when R=r)
Terminal pd V=
-Ir
Comments
No comments have yet been made