Current flow
The answer you are looking for is Amperes or Amps. They are used to measure current flow and Amps do the actual work as they move electrons throughout the system.
An "ampere" is a measure of the current in an electrical circuit.
joules
By 'switching on an electrical appliance' we are completing (closing) the electrical circuit, allowing electricity to flow and the device to work.
the load
load
The load.
how does input device work
Ohm. After Georg Simon Ohm
A electromagnetic bell works by a electrical circuit.
The electrical circuit when turned on it is considered closed. By the same token when an electrical circuit is turned off the electrical circuit is considered open.
That's the electrical current, also known simply as "current". The SI unit for current is the ampere.
Electrical devices need an electrical circuit.