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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 How can a plastic ruler be given an 1 electric charge? answer •By rubbing it. •This causes charges to build up on the ruler. 2 Name a particle responsible for charge? answer Electrons – particles in an atom tiny negative 3 What happens to an atom when it becomes negatively charged? answer It gains electrons 4 What happens to an atom when it becomes positively charged? answer It loses electrons 5 What is build up of charge on an object’s surface called? answer Static electricity 6 What is moving charge called? current answer 7 Why are component symbols used in circuit diagrams? answer Easier to draw and understand 8 Name the parts of the atom answer Electron Nucleus (protons and neutrons) 9 Complete the table? answer Particle Name Charge Location Proton Positive Nucleus Electron Negative Outside nucleus Neutron Neutral Nucleus Electrical Symbol Name of electrical 10 component Cell Battery Ammeter answer Variable resistor Bulb Lead Voltmeter Switch 11 Label the positive and negative ends of the cell. + - answer 12 Draw a series circuit diagram for a torch answer 13 Draw an arrow to show the direction of the current for answer each cell. + - - + A B Negative to positive 14 Match the answer to the circuit. answer Bright Off Dim Very Bright Bright Very Bright Dull Off (two bulbs) (two cells) (cells wrong way round) 15 What is the unit of electric current? What is used to measure it? Amps (A) Ammeter answer 16 What happens to a wire when a large current flows though it? answer It heats up due to resistance 17 What is the unit of voltage? What is used to measure it? answer Volts (V) Voltmeter 18 Name an appliance that uses resistance to produce heat. answer Oven, kettle, straighteners etc... 19 Name an appliance that uses variable resistance. answer •Dimmer switch on a light •Volume control 20 Name the safety device inside a plug. How does it work? answer Fuse It melts when too large a current flows 21 Label the plug answer Earth fuse Live Neutral cable Cable grip 22 What is VOLTAGE? answer The energy supplied by the cell to the charges in the circuit 23 Where should the ammeter be placed? answer A In series 24 Where should the voltmeter be placed? answer Across the component V 25 What is the voltage across the bulbs? answer Series Circuit Voltage of cell = Voltage of all components added together What is the voltage across 26 the bulbs? answer V 3V Parallel Circuit Voltage of cell = 3V V 3V V Voltage of each component What is the current measured at each ammeter? 27 2A A answer Parallel Circuit A Current at cell = 2A A A 1A 1A Current of each branch added together 28What is the current at each bulb? answer 2.5A Current has the same value at all points in a series circuit.