GCSE Physics Revision: Cheeky Revision Shortcuts
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About this ebook
Turn your hard work into the GCSE results with the Cheeky Shortcut Guide to the most common topics within the Physics GCSE subject.
This workbook features key exam topics for physics with precise and clear points to help you achieve top marks.
Covers:
Static and Current Electricity
Properties of Waves
Uses of Waves
Forces, Moments and Pressure
Energy Transfers
Energy Calculations
Radioactivity
Magnetism and Electromagnetism
Space
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GCSE Physics Revision - Scool Revision
1
Static and Current Electricity
Static Electricity
Static Charge
Static charge is a charge that can’t move. There are two kinds positive (+) and negative (-).
All atoms contain positive particles (protons) and negative particles (electrons) but because they contain the same number of protons and electrons they have no overall charge.
Static electricity is caused by an atom having too many or too few electrons (e-).
A Van de Graaff Generator is a machine that generates huge amounts of static charge, by rubbing electrons off a roller and depositing them on the metal dome.
Induction and Earthing
The basic rule you need to know is that Like charges repel and Opposite charges attract.
Induction – This is the effect caused when a charged object causes electrons in another object to move. This causes the uncharged object to become attracted to the charged object.
Earthing – If enough charge builds up on an insulator, the charge can leap the gap, causing a spark. This can be prevented by discharging the object, gradually. This is called earthing.
Useful Static
Static electricity is used in many useful machines like photocopiers and smoke stacks (to remove pollution from the smoke).
Nasty Static
If clouds get charged up enough, you get lightning, the biggest spark of all. Static can also be dangerous when refuelling aircraft. The fuel rubs against the side of the hose and lots of charge builds up. If the plane isn’t earthed, the spark can blow the plane up.
Basic Circuits
Current, Voltage and Resistances
Current – This is a measure of the flow of electrons around a circuit (measured in Amperes or Amps).
Voltage – This is a measure of how much energy the electrons are carrying around the circuit (measured in Volts).
Resistance – This is a measure of how hard it is for the purple to travel through a part of the circuit (measured in Ohms).
Direction Problem!
Current flows from the positive (+ve) terminal of the