AS1 1.11 Internal Resistance and EMF Flashcards
1
Q
What is internal resistance?
A
The loss of P.D per unit current in the source when current passes through the source
2
Q
What is the equation for E.M.F?
A
e = V +Ir
e = E.M.F
V = Terminal P.D
I = current
r = internal resistance
Ir = lost volts
3
Q
In a series of cells, how you get the total E.M.F if both cells are in different directions?
A
Total E.M.F = sums of E.M.F in one direction minus the sums of E.M.F in the other direction.
4
Q
what is the total emf and internal resistance in N amount of cells with identical resistance?
A
Total E.M.F = e
Total Internal Resistance = r/N
The Lost Volts = Ir/N
