a battery
The battery or accumulator in a mobile phone (or other device) converts chemical energy into electrical energy.
The motor changes electrical energy into mechanical (torque) energy.
An electrical generator
Cell
cell
A battery or a fuel cell converts chemical energy directly to electrical energy
an electrochemical cell
A battery
fossil fules
a device that changes mechanical energy into electrical energy
A generator in a power plant converts rotating kinetic energy into electrical energy An electric motor is a device which changes electrical energy into kinetic. For example-- Fans could be like electric energy to kinetic energy...