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A power supply is an electrical function performed by any electrical component capable of supplying or generating a current in a system.
The following electrical components generate or supply an electric current.

Source: Kenishirotie, Shutterstock.com
A battery generates an electric current through the chemical reaction that takes place inside of it.

Source: Grisha Bruev, Shutterstock.com
A photovoltaic cell, also called a solar cell, is a device that generates an electric current by converting radiant energy into electrical energy.

Source: k r e f, Shutterstock.com
A dynamo is a device that generates an electric current by transforming the mechanical energy of the rotating bicycle wheel into electrical energy.

Source: Steve Cukrov, Shutterstock.com
An electrical outlet, also called a power outlet or an electrical socket, is a device that supplies an electric current from the electrical grid.

Source: Orlov Alexsandr, Shutterstock.com
An alternator is a device that generates an electric current by converting mechanical energy into electrical energy.
A car's alternator supplies the car's electrical components and recharges its battery.
A power supply is an electrical function performed by any electrical component capable of supplying or generating direct or alternating current in a system.
The following electrical components generate or supply a direct current.

Source: Kenishirotie, Shutterstock.com
A battery generates an electric current through the chemical reaction that takes place inside of it.

Source: Grisha Bruev, Shutterstock.com
A photovoltaic cell, also called a solar cell, is a device that generates an electric current by converting radiant energy into electrical energy.

Source: k r e f, Shutterstock.com
A dynamo is a device that generates an electric current by transforming the mechanical energy of the rotating bicycle wheel into electrical energy.
The following electrical components generate or supply a direct current.

Source: Steve Cukrov, Shutterstock.com
An electrical outlet, also called a power outlet or an electrical socket, is a device that supplies an electric current from the electrical grid.

Source: Orlov Alexsandr, Shutterstock.com
An alternator is a device that generates an electric current by converting mechanical energy into electrical energy.
A car's alternator supplies the car's electrical components and recharges its battery.