Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

(N/A) An electric generator converts mechanical energy into electrical energy.
The principle of working of an electric generator is based on electromagnetic induction. When a coil is rotated in a magnetic field,the magnetic flux linked with it changes,which induces an electric current in the coil.
$MNST$ $\to$ Rectangular coil
$A$ and $B$ $\to$ Brushes
$C$ and $D$ $\to$ Two slip rings
$X$ $\to$ Axle,$G$ $\to$ Galvanometer
Working: When the axle $X$ is rotated,the coil $MNST$ rotates in the magnetic field. According to Fleming's right-hand rule,an induced current flows in the direction $MNST$ during the first half rotation. After half a rotation,the direction of the current reverses to $TSNM$. This periodic reversal results in an alternating current $(AC)$.
Function of brushes: Brushes ($A$ and $B$) are used to maintain contact with the rotating slip rings or split rings,allowing the induced current to flow from the rotating coil to the external circuit without tangling the wires.