A closed circuit
You'll get the most current in the path of lowest electrical resistance, but be aware that any conducting path will allow a current to flow.
A current wire deflects a magnetic needle placed near it because the current wire is creating an electric field. If the current is supplied from an AC (alternating current source as opposed to DC which is direct current- AC would be from a wall socket, DC from a battery), then the current is constantly changing, so the electric field is constantly changing. A changing electric field results in a magnetic field perpendicular (90 degrees) to it. It is actually the magnetic field that is changing the needle direction, because that needle is trying to follow the magnetic field lines (similar to those that you see when you put iron filing near a magnet).
field
diode
The battery is the power source of the circuit. It supplies current to the circuit and the circuit is simply a path for the current to follow. When you remove the current (battery), the path still exists but there is no current going through it.
An Electric PathA complete path for an electric current to follow is called a closed circuit. Ampere is the SI unit for measuring an electric current.
An electric current follows the path of least resistance.
"least resistance"
The path of least resistance.
There is no limit. If you have a TV, a light and a refrigerator, electric current can go through all three.
An electric current flows from negative to positive.
In order for a current to flow there must be a complete circuit.
Not all current flows in the same direction because electric energy does not follow the circular flow of electricity which results to direct and alternate current.
You'll get the most current in the path of lowest electrical resistance, but be aware that any conducting path will allow a current to flow.
It is called a series circuit.
A circuit in which electricity only flows in one path is called a series circuit.
A current wire deflects a magnetic needle placed near it because the current wire is creating an electric field. If the current is supplied from an AC (alternating current source as opposed to DC which is direct current- AC would be from a wall socket, DC from a battery), then the current is constantly changing, so the electric field is constantly changing. A changing electric field results in a magnetic field perpendicular (90 degrees) to it. It is actually the magnetic field that is changing the needle direction, because that needle is trying to follow the magnetic field lines (similar to those that you see when you put iron filing near a magnet).