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28 Cards in this Set
- Front
- Back
1. What happens when 2 insulating materials are rubbed together? (1 mark)
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Materials become electrically charged as the electrons are rubbed off from one material and onto the other.
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2. When does a material become negatively charged? (1 mark)
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Material that gains electrons becomes negatively charged.
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3. When does a material become positively charged? (1 mark)
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Material that loses electrons become positively charged.
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4. What happens to materials which have similar charge to each other? (1 mark)
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Repel
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5. What happens to materials which are oppositely charged to each other? (1 mark)
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Attract
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6. In which material the electrical charges (electron) can move easily? (1 mark)
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Metals
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7. What is current? (1 mark)
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Flow of electric charge (electrons).
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8. What is the unit of current? (1 mark)
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Amperes or Amps (A)
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9. What is the unit of charge? (1 mark)
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Coulombs (C)
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10. What is the unit of time? (1 mark)
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Seconds (s)
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11. What is potential difference (voltage)?
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Energy transferred per coulomb of charge that passes between 2 points.
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12. What is the unit of voltage (potential difference)? (1 mark)
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Volts (V)
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13. What is the unit of work done? (1 mark)
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Joules (J)
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14. Identify the circuit symbols? (1 mark each)
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? |
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15. Give a use of a thermistor? (1 mark)
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Thermostats, fire alarms, laptop fan as resistance decreases as temperature increases.
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16. Give a use of LDRs? (1 mark)
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Switching lights on when it gets dark as the resistance decreases as light intensity increases (e.g. Street lights).
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17. Draw a current- voltage graph for a resistor at constant temperature? (1 mark)
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18. How can you measure resistance of a component? (1 mark)
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Measure the current through, and the potential difference across the component. Then calculate resistance R=V÷I
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19. What is the unit of resistance? (1 mark)
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Ohms (Ω)
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20. What can affect the amount of current in circuit? (2 marks)
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Resistance in the circuit.The bigger the resistance, the smaller the current in circuit.
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21. What is the total resistance in series circuit? (1 mark)
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Total resistance is equal to sum of the resistance in the circuit. R1 + R2 = R total
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22. What happens to current in series circuit? (1 mark)
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Current stays the same everywhere in series circuit.
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23. What happens to voltage in series circuit? (1 mark)
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Voltage gets shared between the components in series circuit.
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24. What happens to current in parallel circuit? (1 mark)
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Current gets shared between the components in parallel circuit
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25. What happens to voltage in series circuit? (1 mark)
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Voltage stays the same everywhere in parallel circuit.
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26. Draw a graph for resistance of a filament bulb? (1 mark)
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27. Draw a graph for a diode. (1 mark)
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28. What is function of LED? (2 marks)
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LEDs emits light when a current flows through it in forward direction. They can be used in lightning instead of filament bulbs.
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