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AQA GCSE Physics: Unit 2 . Electricity Section . Useful Information . AQA Specification can be found by clicking this link. http://store.aqa.org.uk/sciencelab/AQA-PHYS-W-SP.PDF

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## AQA GCSE Physics: Unit 2

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**AQA GCSE Physics: Unit 2**Electricity Section**Useful Information**• AQA Specification can be found by clicking this link. http://store.aqa.org.uk/sciencelab/AQA-PHYS-W-SP.PDF • GCSE Bitesize relevant pages (Electricity section)http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/electricity/ • S-cool physics current electricity section. http://www.s-cool.co.uk/gcse/physics/static-and-current-electricity**When certain insulating materials are rubbed against each**other they become electrically charged. • Negatively charged electrons are rubbed off one material onto the other.**The material that gains electrons becomes negatively**charged. • The material that loses electrons is left with an equal positive charge. • Have a look at these excellent simulations from the University of Colorado. • Balloons and Electricity http://phet.colorado.edu/en/simulation/balloons • John Travoltage http://phet.colorado.edu/en/simulation/travoltage**Dangers of Static**• Can you think of any dangers of static electricity?**Uses**• Can you think of any uses of static electricity? • Some ideas here: http://en.wikibooks.org/wiki/GCSE_Science/Uses_of_static_electricity**Conductors**• In conductors such as metals electrical charges can move easily. This is because they have a sea of free electrons.**The Coulomb**• The charge on an electrons is very very small. • It is useful to think of electrons moving around in groups called Coulombs. • We talk about a Coulomb of charge.**Voltage –see later for a fuller explanation**• Fancy name – Potential difference • When a coulomb of charge moves around a circuit energy is transferred. • The amount of energy transferred per Coulomb is called the voltage. • Voltage = Energy/Charge**Electrical Symbols**• Do you know the symbols for the following electrical components?**Resistance**• It is easier to pass current through some components than others. • We say that the opposition provided by a component to the current flowing through it is called its resistance. • The greater the resistance then the smaller the current for a given potential difference.**Define Ohm’s Law**• Ohms Law is to do with the relationship between voltage and current. It also is to do with temperature. • You need to be able to write down the law.**Electrical Current**• Electrical Current is a flow of electric charge. • In metals these charges are electrons. • The size of the electric current is the rate of flow of electric charge.**Can you do these questions?**• A current of 2 A flows through an electric light bulb. How much charge flows through the bulb in two minutes? • A charge of 100 Coulombs flow through a component for 20 seconds. What current flows through the component?**Work out the resistance of each of the colour coded**resistors**Current – Potential Difference Graphs – metal wire at**constant temperature**You can learn about circuits easily by simulating them.**• Download this simulator from the University of Colorado and have a go. http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc**If the potential difference of the cell is 60 V then what is**the current flowing through all three resistors?**Calculate the current in the two resistors and the total**current**It can be more complicated if the cells are not all**connected in the same direction**Make sure you learn these facts about LED’s**• An LED emits light when a current flows through it in the forward direction. • There is an increasing use of LEDs for lighting, as they use a much smaller current than other forms of lighting.**LDR’s**• Light Dependent Resistors • What are they used for?**What is the relationship between resistance and temperature?****Learn this about a thermistor**• The resistance of a thermistor decreases as the temperature increases. • A thermistor that does is said to have a _________ _________ __________.**AC and DC**• What does AC and DC stand for and what do they mean? • Have a listed to AC/DC from starlight express. Click for the Youtube video: http://www.youtube.com/watch?v=c8OX7H1mJpw

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