increases when components, for example a lamp, are added to a circuit ... As well as making the lamps dimmer, series circuits also have the problem that when one bulb doesn’t work, the others ...

I now believe that there’s a few gaps that I could bridge. For instance, I have not provided enough example circuits, and sometimes one schematic can convey things better than a thousand words.

For example, 20 A is a bigger current than 5 ... so you may hear or see ‘voltage’ instead of ‘potential difference’. A circuit diagram showing a voltmeter in parallel with a lamp When ...