Physics a level potential divider question the student. A simple potential divider problem to show how to use the potential divider formula and calculate the current and p. Below are links to a broad selection of kits that feature. Fortunately for us, electrons use more energy going through larger resistances and less energy going through smaller resistances. A potential divider is a simple circuit that uses resisters or thermistors ldrs to supply a variable potential difference. At its simplest, a potential divider is a circuit with a voltage source and resistors in series. A series of free gcseigcse physics notes and lessons. May 21, 2018 rise and fall of the clockwork universe. A full set of a level physics notes free to download. Please note that the scheme of assessment has changed since 2005.
The scienti c method begins with a hypothesis that attempts to explain some observed phenomenon. In this circuit, both cells are trying to push current through the wire at p, but in opposite directions. It is helpful to have awareness of potential dividers and resistive input transducers in this section. Bq n is the number of undecayed nuclei present in the sample. Potential divider circuits a level physics youtube. A potential divider, or potentiometer, consists of a number of resistors, and a voltmeter. May 17, 2019 a level physics multiple choice questions and answers pdf to download is a revision guide with a collection of trivia quiz questions and answers pdf on topics. It is based on the principle that the potential drop across a segment of a wire of uniform crosssection carrying a. He is very passionate about science, learning and the science of learning. A level physics help how do potential dividers and potentiometers work.
Oliver toogood has been teaching physics at littleover community school for nearly 10 years. It is used in the volume control knob of music systems. Find out more about newtons laws of motions by downloading the comprehensive notes. Free pure physics, chemistry, geography and social studies revision notes. Download pdf version of all available notes here gce o level singaporecambridge notes. When thinking about potential dividers the trick is to realise that current is the same through each resistor. But, for certain atoms, electrons in the outer shell of an atom can be easily removed. It is a very useful and common circuit and is widely used in our range of electronic kits. Aug 19, 2017 a potential divider, or potentiometer, consists of a number of resistors, and a voltmeter. Aqa alevel physics is a linear subject, so youll be taking all of your exams at the end of the year. This means the larger the resistor, the greater the voltage needed across it for the same current to flow. A level physics multiple choice questions and answers pdf is a revision guide with a collection of trivia questions to fun quiz questions and answers pdf on topics. These are used in particular with ldrs and thermistors to allow only a certain amount of p. A potential divider is a simple circuit with either two series resistors or one variable resistor which can tap some current from the circuit.
Potential divider voltage divider potential dividers divide up the voltage within a circuit, so that parts of a circuit only receive the voltage they require. Examples should include the use of variable resistors,thermistors, and light dependent resistors ldr in the potential divider. An atom consists of protons, neutrons and electrons. It takes 1 year to complete an as course in aqa physics and 2 years to complete a full alevel. This section provides knowledge and understanding of electrical circuits, internal resistance and potential dividers.
Potential divider circuits a level physics duration. Download pdf version of all available notes here gce o. Potential dividers are used to split the potential that is distributed to a circuit, via. Sheets to help students to learn and revise potential dividers for a level physics. Voltage divider formulae the formula sheet for voltage dividers. Cambridge international advanced subsidiary and advanced level 9702 physics june 2018. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse y11, through to university. Potential divider a potential divider is widely used in circuits. Dec 28, 2015 the unknown potential difference or e. Therefore if the two resistors were of equal size the output voltage would equal half the supply voltage.
Physics paper 2 discussion thread help physics potential divider concept potential dividers a level physics help. The two circuits above show two very simple potential dividers. You can download a pdf version of this resource here. Diagram a, shows two resistors, one of them variable. Potential divider for alevel physics teaching resources. Potential dividers a level physics sheet teaching resources. The wiper is connected to a voltmeter, and the circuit is powered by a 120v power source with negligible internal resistance. Potential divider question a level physics the student room. Potential dividers alevel physics help ocr b advancing physics as level g492 prerelease as potential divider question. Potential divider a potential divider is a simple circuit that uses resistersor thermistors ldrs to supply a variable potential difference. Potential dividers in this circuit you have a long piece of resistance wire. Transverse and longitudinal waves, oscillating systems, phase difference, the wave equation, the electromagnetic spectrum and its uses and dangers, reflection and refraction, refractive index, snells law, measuring refractive index, critical angles, total internal reflection, polarisation, using polarised light, pulseecho techniques, ultrasound, the.
These are not too bad just follow the basic rules or circuits and you can solve any problem. This ratio can be used to measure all sorts of resistances, potential differences and emfs. The voltage read by the voltmeter is determined by the ratio of the. For a clearer image of this daily revision calendar for as module 6. A level physics multiple choice questions and answers mcqs. Alevel physics physics alevel resources for aqa, ocr. Potentiometers, rheostats and potential dividers a level physics.
Alevel physics advancing physicspotential dividers wikibooks. The idea is that by using two resistors in series it is possible to divide a voltage and create a different voltage between them. The a level physics music mixer kit has been created by the following team from the university of southampton and uk electronics skills foundation. Without changing the applied potential difference, a second identical wire is placed in parallel with the first wire. This means that for a large resistance across r1 the output voltage will be greater. A full set of revision notes free to help aas physics students. Rheostats and potential dividers a level physics duration. The voltage read by the voltmeter is determined by the ratio of the resistances on either side of the point at which one end of the voltmeter is connected. Which cell wins depends on the position of the sliding contact. Calibrate a thermistor in a potential divider circuit as a thermostat objectives. Ive chosen down to be positive here or throw a stone upwards at 10 ms1. Dr daniel spencer daniel is a lecturer in ecs, and is leading the development of the a level physics kits.
Potential dividers comparators often have potential dividers providing voltages to compare against, sometimes with sensors in. These potential divider circuits divide the potential and. They are large notes so that you ought to be able to work your way through whether you are in class or away at. Ldr and thermistor c i potential divider equations e. From the definition of potential comes the definition of the volt, with specific units for work and charge. Higher physics electricity notes teachers booklet mrs physics. Alevel physics revision notes 2015 contents units, quantities and measurements. Potential divider principle mini physics learn physics.
Newtons laws of motion are three physical laws that describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. The activity a of a radioactive sample is the rate at which nuclei decay or disintegrate. Alevel physics revision notes 2015 scool the revision. A potential divider is a simple circuit that uses resistersor thermistors ldrs to supply a variable potential difference. The syllabus includes the main theoretical concepts which are fundamental to the subject, a section on some current applications of physics, and a strong emphasis on advanced practical skills. From kirchhoffs second law, we know that in a series circuit the current is constant, and the p. Home gcse study tools physics gcse physics ocr potential dividers. As physics chapter 12 notes electric current a level notes. Notes a varying voltage can be obtained from a fixed supply voltage by using a potential divider. The use of the potentiometer as a measuring instrument is not required.
Charge matter is made of tiny particles called atoms. The music mixer circuit board incorporates core electronics concepts suitable for alevel physics students. A potential divider circuit can be constructed as follows. The potential difference between two points in an electric field is numerically equal to. The charge carriers in the wire have a drift velocity v. Users may need to adapt the risk assessment information to local circumstances. Alevel physics advancing physics wikibooks, open books. Gorillaphysics grade 9 and a physics 1,667 views 5. Nov 21, 2012 resources for top a1 candidates taking the 2020 singaporecambridge gce o level exam.
This results in the output voltage from the potential divider being a fraction of the input voltage. Ldrs and thermistors are used to show how changes in light intensity and temperature respectively can be monitored using potential. Then the sheet goes on to explain each section in detail along with examples. As the charge passes through the wire it uses up its potential. Halfway through the wire it has used half the potential 14 of the way through the wire its used a 14 of the potential. Potential dividers usually consist of two or more resistors arranged in series across a. Aug 08, 2016 a lesson on potential dividers containing a starter and several activities.
A potential divider is a simple circuit which takes advantage of the way voltages drop across resistors in series. Pdf a level questions and answers physics download full. To understand how a potential divider works, let us consider resistors in series. They are written for the aqa exam board but should still be useful for all other exam boards, including edexcel, and ocr a and b. May 30, 2015 these potential divider circuits divide the potential and are. Potential dividers are simple, threecomponent circuits designed to control the potential difference in a circuit. A lesson on potential dividers containing a starter and several activities. Potential as charge flows around a circuit it uses up its energy its electrical potential energy and turns it into other forms, such as heat and light. Potential dividers examples, solutions, videos, notes. Use these to help revise for exams and to read through as you go along to build understanding. Newtons laws of motion a level physics revision notes. Alevel physics music mixer kit electronics and computer.
In this time he has seen through three new gcse and two new a level courses, and has been lucky enough to teach some outstanding young students. It is based on the principle that the potential drop across a segment of a wire of uniform crosssection carrying a constant current is directly proportional to its length. Gcse physics ocr potential dividers flashcards in gcse. As charge flows around a circuit it uses up its energy its electrical potential energy and turns it into other forms, such as heat and light. Current is the rate of the flow of charge in the wire or component. Ace your physics here with revision notes and practice questions for gce oa level. The potential divider used to supply constant or variable potential difference from a power supply. Work, energy, power and efficiency are important terms in analysing the performance of machines. Potential dividers can be used to find the emf of a cell. An a level physics revision video covering potentiometers, rheostats and potential dividers. It consists of a variable resistor or fixed resistors in series.
Ocr as and a level physics a delivery guide electricity. In this circuit either of the two resistors can be replaced with an ldr or thermistor to create a circuit able to detect and provide a measure for environmental changes. Accelerated motion, alternating current, as level physics, capacitance, charged particles, circular motion, communication systems, electric current, potential difference and resistance. Edexcel a level physics physics smart notes online. Displacement is the distance of a particle of the wave from its equilibrium position at any. The summary at the start is taken directly from the specification, with everything you need to know.
These potential divider circuits divide the potential. You carry a tennis ball up one floor in the lift, and let it roll back to ground level down the stairs. Normally, the number of protons and electrons are equal and the overall charge of an atom is zero. Particles and medical physics questions suitable for ocr a click here. Cie a level physics 9702 cambridge international as and a level physics builds on the skills acquired at cambridge igcse or equivalent level. Aqa a level physics paper 1 unofficial mark scheme 20th may 2019 aqa physics a level unofficial mark scheme, 74081, 4 june 2018 edexcel alevel physics paper 3 3 june 2019 exam discussion. An a level physics revision video based on potentiometers, rheostats and potential dividers. Apr 08, 2015 cambridge international as and a level physics is ideal for learners who want to study physics or a wide variety of related subjects at university or to follow a career in science. Work work is done when a force moves to the point at which it acts the point of application in the direction of the force. Physics alevel revision notes on kirchoffs laws and potential dividers. Calibrate a thermistor in a potential divider circuit as a thermostat practical activities have been safety checked but not trialled by cleapss. Potential divider definition, aqa physics the student room.
To identify potential divider circuits with components select and use potential divider equations. This initiative has been developed in partnership with the uk electronics skills foundation ukesf, and with the sponsorship of organisations including institution of engineering and technology iet, institution of mechanical engineers imeche, and the era foundation. The output voltage can then be calculated using the following equation. A thermistor can be used in a potential divider to provide a device that responds to. Physics in april module 6 pdf i will post some solutions every so often enjoy. The current is due to the passage of charged particles. Potentiometers, rheostats and potential dividers a level physics duration. A potential divider is a simple circuit that uses resistorsthermistorsldrs to supply a variable potential difference. Alevel physics physics alevel resources for aqa, ocr and.
Get physics as and a level notes here at my new website. Physics alevel year 1 lesson the potential divider. How a potential divider voltage divider works kitronik. They can be used as audio volume controls, to control the temperature in a freezer or monitor changes in light in a room. A level physics notes download a full set of free revision notes for. Begin by following the instructions below to calculate voltages in them.
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