Capacitor charging process
Capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source
This light sensitive alarm is very simple and works using, as main components, a transistor, an LDR and a relay.
The alarm activates when the illumination level changes from almost total darkness to a moderately high illumination level. When this happens the alarm is locked and the alarm signal, be it a light or a sound, remains active.