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