a) Define the EMF (ϵ) of a cell and the potential difference (V) across a resistor R in terms of the work done in moving a unit charge. b) State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell of r. Hence, obtain an expression for the current (I) in the circuit. [5 MARKS]

a) Define the EMF (ϵ) of a cell and the potential difference (V) acro

1.	a) Define the EMF (ϵ) of a cell and the potential difference (V) across a resistor R in terms of the work done in moving a unit charge. b) State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell of r. Hence, obtain an expression for the current (I) in the circuit. [5 MARKS]
Answer» a) Define the EMF $(ϵ)$ of a cell and the potential difference (V) across a resistor R in terms of the work done in moving a unit charge. b) State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell of r. Hence, obtain an expression for the current (I) in the circuit. [5 MARKS]