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