Section B: Electricity The best way to remember the information in this chapter is to get a pen and paper and write down your answers Electricity - Current - Voltage - Power 1 What is Electricity? 2 What is the Difference between a Cell and a Battery? 3 What is the Circuit Symbol for a Cell? 4 What is the Circuit Symbol for a Battery? 5 Which side of a Cell is Positive? 6 Which way does Electricity Flow in Conventional Current? 7 Why not use Electron Flow for Circuit Diagrams? 8 What is a Coulomb a unit of? 9 What is Direct Current? 10 What is the Circuit Symbol for Direct Current? 11 What unit is Current measured in? 12 What type of meter measures Current? 13 Is the meter which measures Current connected in Series or Parallel? 14 Which Equation connects Charge, Current and Time? 15 What does one Volt equal? 16 Which Equation connects Energy, Voltage and Charge? 17 What is the difference between Voltage, Potential Difference and p.d.? 18 What type of meter measures Voltage? 19 Is the meter which measures Voltage connected in Series or Parallel? 20 What is the Circuit Symbol for an Ammeter? 21 What is the Circuit Symbol for a Voltmeter? 22 What is a Watt a unit of? 23 What does one Watt equal? 24 Which Equation connects Power, Energy and Time? 25 Which Equation connects Power, Voltage and Current? 26 What is the Circuit Symbol for a Lamp? 27 Draw the Circuit you would use to calculate the Power of a Lamp.
Electricity - Resistance 28 What unit is Resistance measured in? 29 What is Resistance a measure of? 30 Which Equation connects Resistance, Current and Voltage? 31 Draw the Graph of Current against Voltage for a Resistor. 32 Draw the Graph of Current against Voltage for a Light Bulb. 33 Draw the Graph of Current against Voltage for a Thermistor. 34 What does a Resistor do? 35 What is the Circuit Symbol for a Resistor? 36 What is the Circuit Symbol for a Variable Resistor? 37 Draw the Circuit you would use to calculate the Resistance of a Resistor. 38 What is a Component? 39 Draw a Test Circuit for a Component. 40 How does the Resistance of a Wire depend on its Material? 41 How does the Resistance of a Wire depend on its Length? 42 How does the Resistance of a Wire depend on its Thickness? 43 How does the Resistance of a Wire depend on its Temperature? Electricity - Series Circuits 44 Draw a Circuit with three Resistors connected in Series. 45 How does Current change for Components in a Series Circuit? 46 How does Voltage change for Components in a Series Circuit? 47 How do you calculate the Total Resistance for Components in a Series Circuit? 48 How do you calculate the Voltage for Components in a Series Circuit? 49 When More Lamps are connected in Series, do they get Dimmer or Brighter? 50 If one Lamp Breaks in a Series Circuit, will the others stay On or go Out? Electricity - Parallel Circuits 51 Draw a Circuit with three Resistors connected in Parallel. 52 How does Current change for Components in a Parallel Circuit? 53 How do you calculate the Current in each Branch of a Parallel Circuit? 54 How do you calculate the Total Current for Components in a Parallel Circuit? 55 How does Voltage change for Components in a Parallel Circuit? 56 How do you calculate the Total Resistance for Components in a Parallel Circuit? 57 Draw a Circuit with three Lamps connected in Parallel. 58 How can you Switch each Lamp On or Off without affecting the other Lamps? 59 What is the Circuit Symbol for an Open Switch? 60 What is the Circuit Symbol for a Closed Switch?
Electricity - Diode - LDR - Thermistor 61 What does a Diode do? 62 Draw the Circuit Symbol for a Diode. 63 Draw the Graph of Current against Voltage for a Diode. 64 What does LDR stand for? 65 What is the Circuit Symbol for a LDR? 66 How does Resistance change with Light Intensity for a LDR? 67 Give one Use for a LDR. 68 What is a Thermistor? 69 What is the Circuit Symbol for a Thermistor? 70 How does Resistance change with Temperature for a Thermistor? 71 Give one Use for a Thermistor. Mains Electricity - Current - CRO - Wires 72 What is Mains Electricity? 73 Is Mains Electricity at a Higher or Lower Voltage than a Cell? 74 Is Mains Electricity Alternating Current or Direct Current? 75 What is the Circuit Symbol for Alternating Current? 76 Describe how the Electrons Move in Alternating Current. 77 What does 1 Hz equal? 78 What is a CRO? 79 What does Alternating Current look like on a CRO? 80 What does Direct Current look like on a CRO? 81 Give two Examples of an Appliance. 82 What Colour is the Live Wire? 83 What Colour is the Neutral Wire? 84 What Colour is the Earth Wire? 85 Is it Safe to touch the Live Wire? 86 Is it Safe to touch the Neutral Wire? 87 Is it Safe to touch the Earth Wire? 88 What is the Flex? 89 Which Component connects the Live Wire to the Live Pin of a Plug? Mains Electricity - Safety 90 What does Electrical Insulation mean? 91 What type of Material would be a Good Insulator? 92 How can Insulation become Unsafe? 93 What does Double Insulation mean? 94 Name one Appliance which is Double Insulated. 95 What is the Symbol for Double Insulation? 96 Which part of an Appliance is the Earth Wire connected to? 97 What is the Circuit Symbol for Earth? 98 How does the Earth Wire and a Fuse make an Appliance Safe? 99 What does a Fuse do?
1 What is Electrostatic Charge? 2 How can Insulators be Charged? Charge - Insulator - Electroscope 3 Does an Insulator which Gains Electrons get a Negative Charge? 4 Does an Insulator which Loses Electrons get a Negative Charge? 5 Can Positive Charges in an Insulator move? 6 Do Opposite Charges Attract? 7 Do Opposite Charges Repel? 8 How does the Force of Attraction depend on the Distance between the Charges? 9 Why is a Gold Leaf Electroscope enclosed in a Glass Case? 10 How does the Electroscope show that it is Charged? 11 How can a Charged Object Attract a Neutral Object? The Dangers and Uses of Electrostatic Charge Spray Gun - Inkjet Printer - Photocopier - Chimney 12 How can you get a Shock by touching a Car Door? 13 How can Electrostatic Charge be Dangerous when putting Fuel into an Aircraft? 14 How can the Danger be Avoided? 15 What is an Earthing Strap? 16 How can Electrostatic Charge be Useful when Painting Cars? 17 In an Inkjet Printer, what is a Nozzle? 18 How are Ink Drops directed to the Correct Place for the Image? 19 In a Photocopier, what causes parts of the Drum to Lose Electrostatic Charge? 20 What is the Toner? 21 How do the Drum and Toner make an Image on the Paper? 22 How is the Image Fixed on the Paper? 23 How can Electrostatic Charge Reduce Pollution from a Chimney? 24 How can Electrostatic Charge improve Crop Spraying?