Part IA Linear Circuits and Devices


A Battery Charger

Most battery chargers are powered by the domestic mains electricity supply.  Typically, the alternating supply is transformed down to a voltage compatible with the battery being charged (say, 15 to 20 volts where a 12 volt battery is to be charged); it is rectified to convert it to direct current, and capacitors are used to smooth the resultant supply.

In other instances, for example motor vehicles, where no domestic mains supply is available, the energy required for charging comes from a generator or alternator.   These ....