Physics 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: chhayaCreated on: 13-10-16 16:30 What does the current in an electric circuit depend on? The resistance of the circuit and the supply 1 of 18 When certain ___ materials are ___ against eachother they become _____ ______. insulation, rubbed, electrically charged 2 of 18 ___ charged ___ are rubbed off one material onto the other negatively, electrons 3 of 18 When 2 materials rub against each other the material that gains____ becomes ____ charged and the material that loses ___is left with an __ ___ ___. electrons, negative, electrons, equal positive 4 of 18 What happens when 2 electrically charged objects are brought together? They exert a force on each other 5 of 18 2 objects that carry the same type of charge ____ 2 objects that carry different types of charge____ repel, attract 6 of 18 Electrical charges can...... move easily through some substances , e.g. metals 7 of 18 What is electric current? A flow of electric charge 8 of 18 What is the size of electric current? the rate of flow of electric charge 9 of 18 How do you work out the size of electric current? I = Q ÷ t I = current in amps Q = charge in coulombs t = time in seconds 10 of 18 What is potential difference between 2 points in an electric circuit? the energy transferred (work done) per coulomb of charge that passes between the points 11 of 18 How do you work out potential difference? V = W ÷ Q V = potential difference in volts W = work done/ energy transferred in joules Q = charge in coulombs 12 of 18 What are the rules for components connected in a parallel circuit? The potential difference across each component is the same and the total current is the sum of the current through each component 13 of 18 The ___ of a filament bulb ___ as the ___ of the filament ____ resistance, increases, temperature, increases 14 of 18 The ___ through a diode flows in ___ ___ only. The diode has a very high ___ in the ___ ____. current, one direction, resistance, reverse direction 15 of 18 When does an LED emit light? When a current flows through it in the forward direction 16 of 18 The ___ of a light-dependent resistor ___ as the ___ ___ ____. resistance, increases, light intensity increases 17 of 18 The ___ of a thermistor ___ as the ___ ___ resistance, decreases, temperature increases 18 of 18
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