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Electricity is a set of physical phenomena associated with the presence of motion of electric charge. Click to read even more notes on Electricity. It is one of the easiest ways to convert energy. 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. Particles and Radiation . Transistors became the building blocks of modern circuitry. 1. Potential difference is a measure of work done. In the 1870s, incandescent light bulbs were invented. A source of EMF (for example, a battery) always has some resistance to electric current within it, called its internal resistance. The output of a potential divider is voltage. The power dissipated is given by the following equation. A conducting wire is equivalent to a simple pipe (as shown in Figure 1) in hydraulic flow of horizontal water flow. Figure 1: Hydraulic Flow Analogy of a Conducting Wire. The movement of electric charge is known as current and is measured in amperes. Component charateristics are covered with the IV graphs for resistors (ohmic conductors), filament bulbs and diodes. It is one of the easiest ways to convert energy. It is equivalent to the pressure between two points in a pipe in the hydraulic analogy of horizontal water flow. The relationship between current and voltage of various components will be analysed. In an SI unit system, the unit of EMF is volts. Waves and Optics Waves Questions. Mark Scheme. Mark Scheme. Total for Question 1: 8 (a) De ne electrical work, W, in terms of potential di erence, V, and charge, Q. Circuit rules are covered that include the conservation of charge and energy, the resistance of resistor combinations, potential dividers and internal resistance and emf. When an electric current passes through a resistor, some of the electric energy is lost as heat. Electromotive Force and Internal Resistance. Potential difference between two points is the amount of work done by an electric charge to move from one point to another. Figure 1: Simple Electric Circuit. Mark Scheme. This is called Joule heating. Mark Scheme. The unit for power is watts. Work is defined as the amount of energy transferred. In modern integrated circuits, several transistors are placed in few square centimetres of a circuit. 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. Interferrence Questions. Created by teachers for Physics revision. Physics A-Level Resources for AQA, OCR and Edexcel. Mark Scheme . 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. Questions organised by topic, past papers. Thus, more pressure is required to pass the same amount of water. The resistivity of a material is a fundamental property of a material that quantifies how strongly a given material opposes the flow of current. AQA A Level Physics revision resources. 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. Electricity is a set of physical phenomena associated with the presence of motion of electric charge. This flow of electrons is called a current. This video is revision of all the material you will be taught in your first year of A Levels. It produces an output voltage that is a fraction of the input voltage. The amount of energy supplied to a unit charge is defined as electromotive force (or EMF). It is measured in volts. This website uses cookies to improve your experience. It was one of the first publicly available applications of electric power. In the 20th century, the invention of electronic devices changed the world of circuits. 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. energy transferred (work done)=potential difference×charge. All pipes have some resistance to flow, just as all wires have some resistance to current. AQA A Level Physics worksheets Specification. The rate at which energy is transferred to a circuit element is called power dissipation. In the 1870s, incandescent light bulbs were invented. A complete summary of the topic. Resistors are electric components used to restrict the flow of charges. Matter and Radiation Questions. Conductors for which I-V graphs are straight lines are said to be ohmic conductors. Electric Circuits (AQA A/AS level Physics) Complete online tutorial for download, includes checklist, presentations, revision notes and exam questions. across a 5:0 resistor is measured as 6.0 V. What power is it dissipating? The resistance of a circuit element depends on its resistivity, length and cross-sectional area. International Electric current is equivalent to hydraulic volume flow rate, that is, the amount of water flowing over time. It revises some of the GCSE content you will be familiar with, including current, potential difference and resistance. The law of conservation of charge states that the total electric charge of an isolated system never charges. Electricity has various uses in everyday life. Optics Questions. AQA, Edexcel A Level Physics ELECTRICAL CIRCUITS: Complete Circuits 1 Name: Total Marks: /30 . Photoelectric Effect Questions. 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 AQA Electricity for A Level Physics. Please either accept the cookies, or find out how to remove them. All of AQA Electricity - A Level Physics Revision - YouTube Electricity has various uses in everyday life. 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. It results in the voltage across the terminals of the battery dropping as a current is drawn from it. Using this relationship, [2] show that P = I2R (b) The P.D. The electric charge is equivalent to a quantity of water. 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! Mark Scheme. Because electric charges are invisible, a hydraulic analogy with horizontal water flow is used to visualize the concepts. A potential divider is a circuit component realised with two resistors in series. Quantum Phenomena Questions. Figure 2: Hydraulic Flow Analogy of a Resistor. The resistivity of a material is highly dependent on temperature. Mark Scheme. A cell is said to have an EMF of 1V when it supplies 1J of energy to each 1C of charge. Discover AQA's range of subjects and qualifications. 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