How you should be thinking about electric circuits:
An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground".
Voltage: a force that pushes the current through the circuit (in this picture it would be equivalent to gravity)
simple circuit
A simple electrical circuit. This circuit has a power source, a complete path for electrons to flow, and a resistor as the load. An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the "source" of electrons.
When the switch is closed, the lamp lights up. This is because there is a continuous path of metal for the electric current to flow around. If there were any breaks in the circuit, the current could not flow.
parallel circuits
A Parallel circuit has certain characteristics and basic rules: A parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. The sum of the currents through each path is equal to the total current that flows from the source.
fuse
an electrical safety device that operates to provide overcurrent protection of an electrical circuit including the source of power and the load
its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current
circuit breaker
is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current, typically resulting from an overload or short circuit
its basic function is to interrupt current flow after a fault is detected, unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation
Credits:
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