Things you need to know… About the electricity and magnetism Unit Test

 Atoms and the type of charge the particles have.  Static electricity  Conduction and induction  Current – amps – (I) – the amount of charged particles (e-) flowing past a point in the wire each second

 Voltage – volts – (V) – the amount of electrical energy each particle has  Load – converts electrical energy into other forms of energy  Conductors, insulators, and superconductors  Voltmeters and ammeters – what they measure and how they are hooked up.

 Dry cells and wet cells  Dry cells have two electrodes and an electrolytic “paste.”  Wet cells have two electrodes and a liquid electrolyte. The liquid is an acid.  Primary cells are batteries that cannot be recharged  Secondary cells are batteries that can be recharged

 Dry cells and wet cells  Electrochemical cells convert chemical energy into electrical energy  Cells connected together form a battery  The two electrodes must be made of different metals

 Resistance – Ohms – (R) – reduction of the current in a circuit. (Ώ)  Ohm’s Law – bring a calculator  Schematic symbols – know some  Series and parallel circuits  Direct and alternating current

 Magnetism  Domains  Ferromagnetic metals  Magnetic fields  1st and 2 nd left-hand rules  Generators – convert mechanical energy into electrical energy  Electric motors – convert electrical energy into mechanical energy

 The power formula P = I x V  Watts – power rating – means joules used per second  The energy formula E = P x t  Joules, kilojoules, seconds  The Kilowatt hour – uses kilowatts and hours instead of watts and seconds

 Step-up and step-down transformers  The Law of electric charges  Opposites attract  Like repels  Neutral is attracted to charged  The EnerGuide label – tells how much energy the appliance will consume, on average.

 Remember to bring a pencil, a calculator, and an eraser.  Go over your notes and look through the textbook.  Good luck