State the rule to determine the direction of current induced in a coil due to its rotation in a magnetic field?

Name a device which converts mechanical energy into electrical energy.

(Electric motor/ Electric generator/ Ammeter)

You are given following current $\left(I\right)$ - time $\left(t\right)$graphs.

(a) Name the type of current in each case.

(b) Identify one source for each of the currents.