Concept of Electron Flow

The movement of electrons in matterScience meaning: Matter is any substance (often a particle) that has mass, and also volume (occupies space). Matter exists in three states, solid, liquid and gas and is made up of... More is called Electron Flow, when electron flow occurs, we call the flow Electricity. In wires, electricity moves easily, this is because metals are good conductors of electricity while non-metals are not.

The path which provides for easy flow of electric current for conversion into useful purposes such as lighting and heating is called an Electric Circuit. 

Electrons can only move through a conductor if there is an electrical potential difference between the two ends of the conductor, and if there is an external source that supplies the electrical energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More needed by the electrons to keep moving, e.g a battery or generator.

Potential difference is the work done in moving a unit of positive electric charge from one point to another.

The basic components of electric circuits are:

1. Source of e.m.f (Battery or generator)
2. Switch 
3. Ammeter
4. Voltmeter
5. Resistor 
6. Key 

The electrons gain energy when they flow through the battery, but lose energy when they flow through the bulb. The reason a light bulb glows is that electricity is forced through tungsten, which is a resistor. The energy is released as light and heat.

The current, made up of electrons, flows through the battery, the light bulb and the wires. The electrons will stop flowing if there is a break in the circuit path, and the bulb will stop glowing.

In a circuit, a switch acts to control the current flow. When it is open the circuit is broken/incomplete and no current can flow, on the other hand when it is closed, the circuit is complete and the current can flow again.

What we are simply doing is controlling whether the light bulb is on or off, based on the electron flow.

A voltmeter is an instrument used to measure the potential difference of a conductor. The standard metric unit of electric potential difference is the volt(V). It is always connected in parallel across the point at which the p.d is required. 

An ammeter is an instrument used to measure the flow of current in a circuit. The unit of current is Ampere (A).