Electricity and Magnetism

What is thermal energy? Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. 

Amount of thermal energy electric current produces, depends on substance Current travels through a wire Little energy is produced because wire made of copper Copper = produces very little thermal energy Oven, electric current passes through a substance Produces a lot of thermal energy Switch oven on, it gets hot Thermal Energy

Chemical Reactions Electrolysis - During Electrolysis Chemical reaction that is produced when electric current flows through a liquid solution of charged particles Electrolysis - During Positively charged atoms are attracted to negative electrode Electrode = small piece of metal or other substance that is used to take an electric current to or from a source of power Chemical Reactions

Chemical Reactions - Continued Electrolysis - During Positively charged atoms gain electrons Negatively charged atoms are attracted to positive electrode Negatively charged atoms lose electrons Result Liquid solution transformed into two separate substances Example H2O (Water) = hydrogen gas + oxygen gas Lead Bromide = Lead + bromine Chemical Reactions - Continued

Electroylsis - Demo

How is electrolysis used? Electroplating Involves coating a metal object with a thin layer of another metal Examples = cutlery, tools, jewellery Electroplate Silver Earring Earring is connected to negative side of battery Silver is connected to positive side of battery Both are in liquid solution of silver nitrate Electric current flows, silver atoms slowly attach to surface of earring How is electrolysis used?

Electroplating - Demo

Activities In booklet, Electricity: Effects Exercise 1 In book, Exercise 2 in notebook, complete sentences Activities