**Acceleration:** Velocity change as measure in metres per second (m/s2)

**Alternating current: **Electric current that changes its direction every half-cycle

**Amplitude: **This is the height which a wave (e.g. sound wave) reaches from the zero position.

**Angle of incidence**: This is the angle which exists between an incident ray and the normal

**Angle of reflection:** This is the angle which exists between the reflected ray and the normal

**Conduction: **This is the transfer of energy within matter

**Conductor:** This is a material which easily transfers energy by means of electron movement

**Convection: **This is related to energy transfer within gases and liquids

**Critical angle:** This is the angle of incidence which occurs which light is refracted at 90 degrees to the normal

**Direct current:** Current that flows in only one direction

**Efficiency: **A number or a percentage which represents the ratio energy output to energy input

**Electric current: **The rate at which electric current flows- unit of measurement is amperes, using the symbol A.

**Electron: **A subatomic particle which is negatively charged

**Equilibrium: **An object has equilibrium when it is in a state of rest

**Force:** That which places a push or pull on an object

**Frequency: **The rate at which a wave passes a particular point every second

**Friction: **The force which opposes the movement of a surface over another surface

**Fuse: **A safety device which contains a wire which melts when too much current passes through it

**Gravitational Potential Energy (GPE):** That energy which can be attributed to an object’s mass due to its height above the ground.

**Hooke’s Law:** The extension of a spring is directly proportional to the force applied provided the spring’s limit of proportionality is not exceeded

**Kinetic energy: **The energy generated by a moving object measured in joules

**Longitudinal wave: **A wave in which the vibrations of same are in parallel to the direction of the energy transfer.

**Mass:** The amount or quantity of matter evidenced in an object measured in kilograms (kg)

**Ohm’s Law: **The current passing through a resistor is directly proportional to the voltage across the resistor. V = I x R

**Potential Difference:** The unit of measurement for potential difference (pd) is the VOLT (V) and is a measurement of the energy transferred by each coloumb of charge that passes through a conductive material.

**Power: **The unit of measurement for power is the WATT (W)B and represents the mount of energy transferred every second.

**Resistance: **The unit of measurement for resistance is the OHM () and represents the opposition to the flow of electric current