A conducting wire is equivalent to a simple pipe (as shown in Figure 1) in hydraulic flow of horizontal water flow. This flow of electrons is called a current. Figure 1: Simple Electric Circuit. Potential difference is a measure of work done. Figure 2: Hydraulic Flow Analogy of a Resistor. All of AQA Electricity - A Level Physics Revision - YouTube AQA, Edexcel A Level Physics ELECTRICAL CIRCUITS: Complete Circuits 1 Name: Total Marks: /30 . Discover AQA's range of subjects and qualifications. Electric Circuits (AQA A/AS level Physics) Complete online tutorial for download, includes checklist, presentations, revision notes and exam questions. Potential difference between two points is the amount of work done by an electric charge to move from one point to another. To contribute towards the free videos on YouTube, make a small donation at: ► https://www.paypal.me/physicsonlineFOLLOW ME ► https://www.youtube.com/physicsonline?sub_confirmation=1 ► https://www.instagram.com/physicsonline/ ► https://www.facebook.com/gcseandalevelphysicsonline#physicsonline Mark Scheme. Resistivity is introduced and he way that some semi-conductors decrease their resistance with temperature and some materials even have zero resistance at really really low temperatures. Questions organised by topic, past papers. The resistivity of a material is a fundamental property of a material that quantifies how strongly a given material opposes the flow of current. Electricity is a set of physical phenomena associated with the presence of motion of electric charge. Quarks and Leptons Questions. Matter and Radiation Questions. It is one of the easiest ways to convert energy. Mark Scheme. Resistors are electric components used to restrict the flow of charges. Because electric charges are invisible, a hydraulic analogy with horizontal water flow is used to visualize the concepts. Mark Scheme. Electricity is a set of physical phenomena associated with the presence of motion of electric charge. The resistivity of a material is highly dependent on temperature. The relationship between current and voltage of various components will be analysed. In the 1870s, incandescent light bulbs were invented. Please either accept the cookies, or find out how to remove them. International Electricity has various uses in everyday life. energy transferred (work done)=potential difference×charge. Thus, more pressure is required to pass the same amount of water. This website uses cookies to improve your experience. It is one of the easiest ways to convert energy. AQA Electricity for A Level Physics. Figure 1: Hydraulic Flow Analogy of a Conducting Wire. AQA A Level Physics revision resources. Work is defined as the amount of energy transferred. Transistors became the building blocks of modern circuitry. It is measured in volts. When the I-V graph is nonlinear, the conductor is said to be non-ohmic – a lamp and semiconductor diode are two examples of non-ohmic conductors. A source of EMF (for example, a battery) always has some resistance to electric current within it, called its internal resistance. Physics A-Level Resources for AQA, OCR and Edexcel. A complete summary of the topic. Electric current is equivalent to hydraulic volume flow rate, that is, the amount of water flowing over time. A cell is said to have an EMF of 1V when it supplies 1J of energy to each 1C of charge. The unit for power is watts. Conductors for which I-V graphs are straight lines are said to be ohmic conductors. The law of conservation of charge states that the total electric charge of an isolated system never charges. When an electric current passes through a resistor, some of the electric energy is lost as heat. Electricity has various uses in everyday life. AQA A Level Physics worksheets Specification. The rate at which energy is transferred to a circuit element is called power dissipation. It revises some of the GCSE content you will be familiar with, including current, potential difference and resistance. Mark Scheme. Mark Scheme . It results in the voltage across the terminals of the battery dropping as a current is drawn from it. In an SI unit system, the unit of EMF is volts. Waves and Optics Waves Questions. In the 20th century, the invention of electronic devices changed the world of circuits. All pipes have some resistance to flow, just as all wires have some resistance to current. Click to read even more notes on Electricity. The amount of energy supplied to a unit charge is defined as electromotive force (or EMF). Optics Questions. The power dissipated is given by the following equation. Using this relationship, [2] show that P = I2R (b) The P.D. I took these from flashcards I made whilst I was taking the A-Level and foun... A collection of the definitions required for AQA A-Level Physics, Electricity. A resistor is equivalent to a constriction in the pipe as shown in Figure 2. It is used to transform information from sensors like light-dependent resistor and thermistor into a quantity that can be used to display the information. Particles and Radiation . The potential difference across a circuit element measures the energy transferred to it per unit charge flowing to it, the current measures the rate of flow of charge through it. Mark Scheme. The movement of electric charge is known as current and is measured in amperes. The electric charge is equivalent to a quantity of water. This is called Joule heating. Component charateristics are covered with the IV graphs for resistors (ohmic conductors), filament bulbs and diodes. 1. A potential divider is a circuit component realised with two resistors in series. When the switch is closed, the electrons move from the negative terminal to the positive terminal, due to the energy from the battery, and the bulb glows. The resistance of a circuit element depends on its resistivity, length and cross-sectional area. Photoelectric Effect Questions. Quantum Phenomena Questions. It produces an output voltage that is a fraction of the input voltage. Circuit rules are covered that include the conservation of charge and energy, the resistance of resistor combinations, potential dividers and internal resistance and emf. across a 5:0 resistor is measured as 6.0 V. What power is it dissipating? Total for Question 1: 8 (a) De ne electrical work, W, in terms of potential di erence, V, and charge, Q. It is equivalent to the pressure between two points in a pipe in the hydraulic analogy of horizontal water flow. Electromotive Force and Internal Resistance. Interferrence Questions. Mark Scheme. Don't forget of course that there are hundreds of in depth videos on my website that explain everything in this video in even greater detail.Thanks for watching, Lewis_____________________________________MY PHYSICS WEBSITESFind even more videos organised by exam board and topic at: GCSE Physics Online ► https://www.gcsephysicsonline.com A Level Physics Online ► https://www.alevelphysicsonline.comMY YOUTUBE CHANNELYour support in watching this video has been invaluable! This video is revision of all the material you will be taught in your first year of A Levels. Created by teachers for Physics revision. The output of a potential divider is voltage. In modern integrated circuits, several transistors are placed in few square centimetres of a circuit. It was one of the first publicly available applications of electric power. In the 1870s, incandescent light bulbs were invented. Were invented publicly available applications of electric charge for which I-V graphs are straight are! 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