However if the switch fails it does not close the circuit so there is no continuity.
Wall light switch circuit.
In the image above the blue shaded area is your loft or floor void w wall lights and s switch.
A single pole wall switch usually has a lever or toggle that completes the circuit when it is flipped up to turn a light device or appliance on.
A circuit that is closed has continuity.
If all is well and good your lighting should be up and running.
Now run through each connection check it fit the covers on junction boxes insert the fuse and switch on.
The simplest and most common light switch is actually referred to by hardware dealers and electricians as a single pole light switch with a single pole light switch flipping the toggle or paddle up completes the circuit turning lights or appliances on and flipping it down breaks the circuit turning lights or receptacles off.
Pick a single pole light switch for most applications.
Completed switch circuit with additional light added.
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There is continuity when the switch is on and there is no continuity when the switch is off.
A light switch opens and closes a lighting circuit.
A circuit that is open is broken and has no continuity.
Because the electrical code as of the 2011 nec update requires a neutral wire in most new switch boxes a 3 wire cable runs between the light and switch.
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This is an updated version of the first arrangement.
Common applications include ceiling or hallway light switches a cellar or attic light a ceiling fan or chandelier or an outdoor patio light.
The red and black are used for hot and the white neutral wire at the switch box allows for powering a timer remote control or other programmable switch.
Choose from outlet covers like toggle switch plates and rocker switch plates or blank wall plates as simple additions to beautify.
Keep the circuit breaker flipped off for this.