The circuit in which current flows is called electric circuit, also called a conductive circuit.
According to a certain task, the required devices are connected with wires to form a circuit.
The circuit is the electric power system, the control system, the communication system, the computer hardware and so on. Electrical system main component, plays the electric energy and the electric signal generation, the transmission, the transformation, the control, the processing and the storage and so on the function.
The simplest circuit is composed of power supply, electrical appliances (load), wires, switches and other components.
When the circuit is on, it is called a path, when it is off, it is called an open path.
Only the path, the circuit has a current through.
A disconnection at one point in the circuit is called a break or an open circuit.
If there is no load between the positive and negative poles of the power supply in the circuit, but the direct connection is called short circuit, this situation is never allowed.
Another kind of short circuit is a direct connection between the two ends of a component, in which current flows through the direct connection without passing through the component. Such a situation is called a short circuit of the component.
Open circuit (or open circuit) is allowed, and the first kind of short circuit is never allowed, because the short circuit of the power supply will lead to the burning of the power supply, short circuit with electrical appliances will lead to the use of electrical appliances, electricity meters and other can not work properly.
