Think about all the different types of battery you can get. Even though they all look very different, they are all represented by the same symbol. This circuit diagram joins a cell, a switch and ...

A circuit always has a battery (cell ... When drawing circuit diagrams, rather than drawing detailed components, we use simple symbols to represent the different components.

Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is ...