Ionisation – occurs when an atom loses electrons. Thermionic Emission – is the giving off of electrons from the surface of a hot metal. Photoelectric Effect – is the emission of electrons from a metal due to light of a suitable frequency falling upon it. Photon – is a discrete… Continue Reading →
Displacement – is distance in a given direction. Speed – is the rate of change of distance with respect to time. Velocity – is the rate of change of Displacement with respect to time. Acceleration – is the rate of change of Velocity with respect to time. Scalar Quantity –… Continue Reading →
Temperature – of an object is a measure of the hotness or coldness of that object. Thermometric Property – is any physical property that changes measurably with temperature. Specific Heat Capacity – of a substance is the heat energy needed to change one kilogram of the substance by one Kelvin…. Continue Reading →
Real Image – is an image formed by the actual intersection of light rays. Virtual Image – is formed by the apparent intersection of light rays. Refraction – is the bending of light as it passes from one medium to another. The Refractive Index of a Medium – is the… Continue Reading →
Goods – can be physically weighed or measured Services – tasks that people or machines perform Producer – a business that gathers raw products in their natural state Processor – changes raw materials into more finished products Manufacturers – businesses that make finished products out of processed goods Intermediary –… Continue Reading →
Coulomb’s Law – states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. Electric Field Strength (E) – is the force per unit charge. Potential Difference (p.d.) – between two point is the… Continue Reading →
Safety Order – Prevents use of, or threat of violence. The person does not have to leave the family home. It can last from one to five years and can be renewed. If couples live apart the order prevents watching or loitering near the family home. Co-habiting couples must have… Continue Reading →
the five senses are – smell, sight , taste, touch and hearing the energy value of food is measured in – kilocalories of kilojoules examples of staple foods are – bread and potatoes what is bad nutrition – malnutrition too little food causes – starvation too much food causes –… Continue Reading →
Loss leader – Product sold below cost Caveat Emptor – “Buyers Beware” Consumers Association Ireland – Voluntary agency campaigning for consumer rights Receipt – Proof of purchase Consumer – Someone who buys goods or uses services Small claims court – Deals with claims of value less than €1,270 Monopoly –… Continue Reading →
Coulomb – the unit of electric charge Insulator – a substance in which electricity does not flow Conductor – a substance in which electricity flows All static charge lies on the – outside of a conductor Static charge on a conductor accumulates – where the conductor is more pointed Coulomb’s… Continue Reading →
