Question

ACTIVITY: fnfidng the PD

1. to carry how much charge between two points having potential difference equal to 220V, 1760J of work is done?
2. the EMF of a cell falls from 3 volts t 2.8 volts when its terminals are joined to n electrical load of 4 Ohms. calculate the internal resistance of the cell.

Answer 1

potential difference = work done / charge

thus charge =work done / potential difference

=1760/220=8C

$\frac{e-V}{1} × \frac{R}{V}=r$

$\frac{3-2.8}{1} × \frac{4}{2.8} =0.29ohms$