Unit IV: electricity and magnetism

Voltage

The difference in energy per unit charge as a charge movies between two points an electric current

Current

A continuous flow of charge caused by the motion of electrons; the rate at which a charge passes a given point; expressed in amperes

Resistance

The opposition to the flow of electric charge: expressed in ohms

Electricity

A form of energy resulting from the existence of charged particles (electrons, protons)

Direct Current (DC)

Electric current, in which charges always flow in the same direction

Alternating Current (AC)

Electric current in which charges continually switch from flowing in one direction to flowing in the reverse direction

Series Circuit

Circuit in which all parts of connected in a single loop

Parallel Circuit

Circuit in which different loads are on separate branches

Circuit

A complete close pass through which electric charges flow

Magnetism

A physical phenomenon produced by the motion of the electric charge, resulting in attractive and repulsive force between objects

Generator

A device that uses electromagnet induction to convert kinetic energy into electrical energy

Flow of Electrons

Electrons flow from the negative terminal to the positive

Ammeter

An instrument used to measure current in a circuit

Directional Compass

A tool which point out directions (north south east west)

Electromagnet

A magnet that consist of a solenoid wrapped around an iron core

Simple Motor

Electrical machine that converts, electrical energy into mechanical energy

Switch

A device for making and breaking the connection in electrical circuit

Ampere

The SI base unit of electric current

Ohm

The SI unit of electrical resistance, expressing the resistance in a current transmitting, a current of 1 ampere when subjected to a potential difference of one unit

Source

A device that is capable of converting non-electrical energy into electrical energy

Volt

The electrical potential between two points of a conducting wire, when the electric current of one ampere dissipates 1 watt or power energy

Load

Any component of a circle that consumes power or energy

Electromagnetic Induction

The process by which an electric current is produced by changing a magnetic field

Resistor

An electrical component that limits or regulate the flow of electrical current in an electrical circuit

Solenoid

A device consisting of a coil of wire the housing and a movable plunger

Electron

Negatively charged particles, found in all atoms

Voltmeter

An instrument for measuring electrical potential in volts