Switches & Capacitors

Switches

Switches control devices in simple __________, for example:

  1. A circuit to control a single light in a room
  2. A circuit with two switches to control one light
  3. A circuit to independently control two lights with two switches
  4. A circuit to control a light that requires two switches to be closed at once
We can also use electromagnetically activated switches called __________. This allows a __________ control current to activate a __________ load current, capable of doing work.

When the switch is __________, the __________ flows in the 'control' (red) circuit. The coil becomes an __________ attracting the __________ which pushes the __________ together. This completes the other (blue) circuit activating a device, in this case a __________

Capacitors

Capacitors consist of two close, conductive __________, separated by an __________ (could be an air gap).

When there is a potential difference applied across the plates, extra__________ begins to fill up on one plate and __________ charge from the other. This creates a potential difference between the plates as more and more charge is forced on.

This all takes time and so a capacitor can be used as simple timers in electronic circuits and can be used as an 'input sensor' for a time delay switch.