The whole of AQA – ELECTRICITY. GCSE 9-1 Physics or Combined Science Revision Topic 2 for P1

The whole of AQA – ELECTRICITY. GCSE 9-1 Physics or Combined Science Revision Topic 2 for P1


Hey guys, so here’s the whole topic summary for aqa phyics electricity electricity now this has so many practicals in they are absolutely key and important if you want to list what the core practicals for this and all the other ones you can go over to website get my free version guide or you get on Amazon you Need to know all of these circuit symbols, I’ve made you handy flashcards for this, but here is a quick recap This is a cell. This is a battery You’ll notice that a battery is more than one cell put together here. We have an ammeter Voltmeter a Lamp or a bulb diode an LED light emitting diode resistor Variable resistor Fuse thermistor LD our light dependent resistor Close switch I can switch here we have a circuit in series where you can run your finger the whole way through from the battery to all the components and Here we have a series in parallel where it has like branches or ladders you can’t run your finger around Everything without going over something’s wife You’ll notice here We have an anteater that is in series and our voltmeter that has to be in parallel around the component Charge is the value of electricity flowing through circuits Current is flow of electrons Potential difference is what pushes the current around And resistance is anything that slows down the current Charge equals current times time Charge is measured in coulombs Current is measured in amps time is measured in seconds Potential difference equals current times resistance Potential difference is measured in volts current is measured in amps resistance is measured in ohms There are three current potential difference across you expected to recognize and remember current here is measured in amps average age difference is measured in volts a Resistor at a constant temperature the current and potential difference are directly proportional to each other For a filament bulb we have our graph going through a zero looking like this this is was as the temperature increases the resistance increases and A diode will only let current flow in one direction so the graph looks like this the direction that it is pointing But there was still using stuff like your central heating and it’s only getting at current flow at certain temperatures For example at the high temperature our graph looks like this Whereas our low temperature the graph is going to look much lower So as the temperature changes the resistance changes for a light dependent resistor whether the lights are on or off is going to depend on the quantity of lights we can use this and streetlights or security lighting If we have a bright light That’s what I’ll graph is going to look like but then if I like dims it is going to change So that resistance flowing through the circuit changes with the amount of lights We can think of current as electrons moving around our circuits and in a series circuit They all move in the same way they all be for the same path So wherever we look in a series circuit the current is going to be the same? However in a parallel circuit that current comes out the battery all of this is going to pass the first ammeter move down here And then when it gets this point it has two choices of where to go in though this way past this a metal or down Here in this way past this ammeter So the current gets split Peled your difference measured by a voltmeter when I measure the voltmeter around the battery then a voltmeter around each of the bulbs and you’ll notice that the Potential difference the voltage at the battery is splits across the components Whereas in a parallel circuit The potential difference that we have here across the battery is the same as we have across each of the branches Our Circuits are getting quite complicated out. I’m against me looking out resistance when we have resistors are in series The total resistance is just them added together Whereas when we have resistors that are in parallel the total resistance is one favored Resistance or resistant one plus one over resistance number is number T. And I decided on so Current in a series circuit is going to be the same wherever you looking it But you have to add up different potential differences to get the total potential difference and add up the different resistances to get the total resistance on a Parallel circuit the current on each branch is going to equal to the total current but the potential difference on each branch is going to be the same to find the total resistance you need to do one over the resistance on each branch Mains electricity in the UK is 230 volts and 50 Hertz Inside plug socket we have a fuse which has a very small bit of wire going through it we can see from the circuit symbol for a fuse wire going all the way through and This wire will melt if too much current goes through it’s that’s a safety feature of the plug We have a live wire the earth wire which is another safety feature Plug the neutral wire the pins holding them down the cable grip another safety feature making sure that The Y doesn’t go anywhere the cable which is doubly encased in plastic This is encased in plastic then this is encased in plastic again another safety feature of the plug and the plastic casing and another safety feature of the plug Power is equal to potential difference times current Power is measured in watts. That is a capital W. 20 difference is measured in V. And current is measured in amps Power is equal to the current squared times the resistance Power is measured in what capital W. Current is measured in amps and resistance is measured homes a Lot of Matson’s for you, so here is a quick little duckling breaks or refreshes or a bit more ISM Energy is equals power times time Energy is measured in joules as capital J. Power is measured in watts with a capital W and time settings with the lowercase s Energy is equal to charge times potential difference Energy is measured in joules charge is measured in coulombs and Potential difference is measured in volts The National Grid is how we get electricity from power stations to our houses The power stations generate the electricity and they moved to a step-up transformer And then through a network of cables and pylons this gets moved across country to a step-down transformer and then into our houses Step up and step down transformers are important part of our National Grid They work by having a varying number of coils on each side depending whether it’s step up or step down transformer a step up transformer totally low voltage into a high voltage so that the Energy Humira system electricity can move through a system with less energy loss making it more efficient Or as I said an tracks will more take it from high voltage into a low voltage, so it’s safe to be in our homes When we have static electricity we have an object that isn’t normally being charged becoming charge thousands when two insulators rub together this is hoarse by the movement of electrons from one thing to another thing and you’re going to get a Shock when the charges reset and when you touch something metal if you have two charged objects coming together They’re going to repel each other Alternatively if you have a charged objects m and a drop date, which has the opposite charge. They’re going to attract each other

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