current can be defined as the rate of transfer of electric
charge across a cross sectional boundary. The current flows
opposite to the motion of electrons. It is represented by
‘I’ and its unit is ampere.
I = dq/dt
Where q is the electric charge.
difference is responsible for the flow of current in a
closed circuit. Larger is the potential difference, larger
will be the larger will be the current strength and vice
versa. It can be defined as the difference in electric
pressure between the two ends of a conductor.
The unit for potential difference is Volt and it is
represented by ‘V’.
It can be defined as the property of a material which
opposes the electric current to flow through it.
Generally it is represented by ‘R’ and the unit for the
measurement of resistance is ohm.