We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byJordan Doyle
Modified about 1 year ago
© Boardworks Ltd 2003 IGCSE Electricity – Simple Circuits
© Boardworks Ltd 2003 Current state that current is related to the flow of charge use and describe the use of an ammeter show understanding that a current is a rate of flow of charge and recall and use the equation l = Q/t distinguish between the direction of flow of electrons and conventional current
© Boardworks Ltd 2003 Circuit symbols Instead of drawing intricate diagrams of electrical components we use circuit symbols to simplify how circuits are set up. You will need to learn these, how to draw them, and how to identify them. Filament lamp
© Boardworks Ltd 2003 Use a textbook or other resource to fill in the table below: ComponentCircuit symbol Fuse Switch Resistor Motor M
© Boardworks Ltd 2003 ComponentCircuit symbol Cell Voltmeter Battery Ammeter A V Use a textbook or other resource to fill in the table below:
© Boardworks Ltd 2003 Breaks in circuits Set up the circuit shown…. …does the bulb light? Why does the bulb not light? There is a break in the circuit. For electricity to flow in a circuit it must be able to flow from one terminal of the cell or battery to the other terminal. NO
© Boardworks Ltd 2003 Letting electricity pass Do all materials let electricity pass? Which materials will and which materials will not? Set up the circuit shown and place different materials in the gap in the circuit. Record which materials let electricity through (the bulb lights if electricity flows). What do we call a material that lets electricity flow through it? CONDUCTOR What do we call a material that does not let electricity flow through it? INSULATOR
© Boardworks Ltd 2003 Which of these bulbs will light? Build the circuits! A. B. C. x x Electricity will always take the easiest path. It is easier to flow through a wire than through the bulb. So in circuits B and C the electricity does not pass through the bulb. The cell or battery still loses energy because, electricity is still flowing. This type of circuit is known as a SHORT CIRCUIT.
© Boardworks Ltd 2003 Electron flow Electricity in wires is a flow of electrons along the wire. What do we call this flow of electrons? Electrical current
© Boardworks Ltd 2003 When we talk about current flowing we say that current flows out of the positive terminal of the cell and back into the negative terminal. Current Flow Conventional Current What do we call this flow?
© Boardworks Ltd 2003 However, the electrons flow from the negative side of the battery to the positive side. These are the particles which are actually moving through the conductor. Electron Flow
© Boardworks Ltd 2003 When electrons were discovered, physicists worked out what was really happening. Negatively charged electrons are repelled out of the negative terminal of the cell. They then travel round the circuit and are attracted back to the positive terminal. Conventional current and Electron flow Conventional current electrons Conventional current What charge do electrons have? Negative What do two negative charges do if placed near to each other? They will repel each other. What will a positive and a negative charge do to each other? They will attract each other.
© Boardworks Ltd 2003 In an electric c____, current is the flow of c_______. The bigger the current, the m___ charge is flowing around the circuit. The w___ carry the electrons from one terminal around the circuit to the other t______. Current lamps ircuit harge ore ires erminal
© Boardworks Ltd 2003 Current Current=Charge/time I=Q/t Q is measured in Coulombs (C) t is measured in seconds (s) I is measured in Amperes (A)
© Boardworks Ltd 2003 Set up the two circuits shown: In which circuit are the bulbs the brightest? BRIGHTER DIMMER A. B.
© Boardworks Ltd 2003 Measuring current To find the current through a component connect an ammeter next to the component (in series) Make sure the + side of the ammeter is connected nearest to the + side of the power supply All of the current flowing through the component must pass through the ammeter Now measure the current in each bulb in your circuits
© Boardworks Ltd 2003 Set up the two circuits shown: Which bulbs have the largest current? MORE CURRENT LESS CURRENT A. B.
© Boardworks Ltd 2003 Charge, current and time We can express a relationship between charge, current and time mathematically using the equation: Charge = Current x time Q=It Charge measured in Coulombs (C) Current measured in Amps (A) Time measured in seconds (s)
© Boardworks Ltd 2003 Formula triangles Q I tt x Formula triangles help you to rearrange formula, the triangle for Q=It is shown below: Whatever quantity you are trying to find cover it up and it will leave you with the calculation required. So if you were trying to find current, I….. …you would cover I up… …and you are left with the sum… I = Q t
© Boardworks Ltd 2003 A current of 6A flows for 3 minutes. How much charge flows? Q= It = 6A x (3x60)s = 1080 C In an examination you will not gain a mark for just writing Q=It. You must write out the whole formula: Charge = Current x time Always convert time to seconds!!!
© Boardworks Ltd 2003 To do P176-177 Answer questions 1-4
© Boardworks Ltd 2003 Progress check state that current is related to the flow of charge use and describe the use of an ammeter state that current is a rate of flow of charge use the equation l = Q/t distinguish between the direction of flow of electrons and conventional current
© Boardworks Ltd 2003 KS4 Electricity – Simple Circuits.
Voltage state that the e.m.f. of a source of electrical energy is measured in volts show understanding that e.m.f. is defined in terms of energy supplied.
Electrical Circuits. A path where electric charges move along (through wires).
© Boardworks Ltd Drawing circuit diagrams You must have –Straight lines –Sharp corners –Use the correct symbols.
© Boardworks Ltd 2003 IGCSE Electricity – Resistance.
© Boardworks Ltd of 34 KS4 Physics Electric Circuits.
Circuits – Current and Voltage. Quick Starter Complete the Handout called ‘Voltage’ –Definitions of terms that you should be familiar with When finished,
Topic 2 Electricity Within a Circuit. Static and Current Electricity: When charged particles build up in an object it is called static electricity. Another.
ELECTRICAL CIRCUITS. The CELL The cell stores chemical energy and transfers it to electrical energy when a circuit is connected. When two or more cells.
Current Electricity 1. What is Electric Current? Electric current is the flow of electricity through a conductor. The current is caused by the movement.
ELECTRIC CURRENT AND VOLTAGE. Specification Electricity Energy and potential difference in circuits explain why a series or parallel circuit is more appropriate.
Electric Current and Circuits Lesson 3. Electric Current Electrons in a static state have energy, but are far more useful when they are made to transfer.
Current Electricity. An electrical current is a flow of charged particles (electrons or ions) through a circuit.
1 of 45© Boardworks Ltd of 45© Boardworks Ltd 2007.
Electric Current. When electric charges (electrons) move from one place to another, they are known as an electric current Current is defined as the amount.
S.MORRIS 2006 ELECTRICAL CIRCUITS More free powerpoints at
Electronics revision Electronics Revision Part 1.
Electrical Symbols SNC 1D. Drawing a circuit Each item has a symbol Bulb Connecting Wires = =
P6 Flavour Sharing Charging Logic gates Motoring and Generators Resisting Computer circuits Transformers lessons 8 Home works End of topic assessment.
EDEXCEL IGCSE / CERTIFICATE IN PHYSICS 2-3 Current and Voltage in Circuits Edexcel IGCSE Physics pages 74 to 81 June 17 th 2012 Content applying to Triple.
© Boardworks Ltd 2003 KS4 Electricity – Resistance.
All matter is made of tiny particles called atoms. Atoms are made of 3 different types of particles: 1. Protons 2. Neutrons 3. Electrons.
Simple Electric Circuits D. Crowley, Simple Electric Circuits To be able to draw simple electric circuits and know what happens when more bulbs.
2c) Energy and Potential Difference in Circuits Part 1 Current and Charge.
Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?
Circuits Electric Circuit: a closed path along which charged particles move Electric Current: the rate at which a charge passes a given point in a circuit.
SOLUTION OF ELECTRIC CIRCUIT. ELECTRIC CIRCUIT AN ELECTRIC CIRCUIT IS A CONFIGURATION OF ELECTRONIC COMPONENTS THROUGH WHICH ELECTRICITY IS MADE TO FLOW.
ELECTRICAL CIRCUITS. Ohm’s Law I = V / R Georg Simon Ohm ( ) I= Current (Amperes) (amps) V= Voltage (Volts) R= Resistance (ohms)
Introduction to Current Electricity, Part 1 Grade 9 Academic Science R.H. King Academy.
1 of 10© Boardworks Ltd 2015 Electrical Circuits.
KEY WORDS: Insulating Electron Attract Repel Resistance Series ASSESSMENT: P2 REVISION – CHAPTER 4 – Current Electricity Electric symbols Electrical Charges.
10.2: Electricity and Electric Circuits. Static vs. Current Electricity Static Electricity: charges build up in one location Current Electricity: electrons.
ELECTRICAL CIRCUITS. Circuits Circuits are paths which small particles flow through to provide us with electricity for lights, appliances, and other devices.
Electric Circuits Recall: Terminal = electrode = +ve and –ve ends Metal component on cell that supplies electrons (-ve) or receives electrons (+ve) Must.
S.MORRIS 2006 Currents CIRCUITS More free powerpoints at
© Boardworks Ltd of 41 KS4 Physics Resistance and Power.
Electric Current Electric Current is the measure of the rate of electron flow past a given point in a circuit; measured in amperes (A).
2.2. Electric Circuits Recall: Terminal = electrode = +ve and –ve ends Metal component on cell that supplies electrons (-ve) or receives electrons (+ve)
Aim: Recognise that current will not flow around an incomplete circuit. Identify a range of materials that allow a current of electricity to flow around.
Starter question A current of 0.15A flows around a circuit for 1 minute. How much charge flows past any point in this time? Show all working out.
Electric charge Electric charge can be either positive or negative. In an atom an electron has a negative charge that is of the same size as the positive.
Electric Circuits Road Signs - USA Road Signs- France Road Signs- Mexico Hazard Symbols Road Signs- UK Washing Symbols What do these represent? Why do.
Electricity Jeopardy Circuits 1 Circuits 2 Electric Current OhmExtra Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy.
ELECTRICAL CIRCUITS. What is an electric current? An electric current is a flow of electrons through wires and components. + - In which direction does.
Physics I Honors 1 Current and Circuits Circuits Schematics Use of Meters.
Current Electricity SNC Grade 9. A Simple Circuit Load/Resistance Connecting wires Power source.
© 2017 SlidePlayer.com Inc. All rights reserved.