## Electromotive Force (e.m.f) and Internal Resistance

 3.3 Electromotive Force (e.m.f) and Internal Resistance

 Electromotive force, $$\varepsilon$$ Energy transferred or work done by an electrical source to move one coulomb of charge in a complete circuit. $$\varepsilon=\dfrac{E}{Q}$$, where, $$\varepsilon$$ = electromotive force, E = energy transferred / work done, Q = the amount of charge flowing

 Internal resistance, r Resistance caused by electrolyte in the dry cell. $$\varepsilon > V$$ $$Ir = \varepsilon - V$$

 Formula relating E, V, I, R and r $$\varepsilon = V+Ir$$ $$\varepsilon = I(R+r)$$

## Electromotive Force (e.m.f) and Internal Resistance

 3.3 Electromotive Force (e.m.f) and Internal Resistance

 Electromotive force, $$\varepsilon$$ Energy transferred or work done by an electrical source to move one coulomb of charge in a complete circuit. $$\varepsilon=\dfrac{E}{Q}$$, where, $$\varepsilon$$ = electromotive force, E = energy transferred / work done, Q = the amount of charge flowing

 Internal resistance, r Resistance caused by electrolyte in the dry cell. $$\varepsilon > V$$ $$Ir = \varepsilon - V$$

 Formula relating E, V, I, R and r $$\varepsilon = V+Ir$$ $$\varepsilon = I(R+r)$$