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Science - Electric Circuits

  1. State the use of a battery in a circuit
    It provides energy to move charges around a circuit
  2. State the use of a switch in a circuit
    It completes a circuit when closed
  3. State the use of a bulb in a circuit
    It converts electrical energy to light energy
  4. State the use of a buzzer in a circuit
    It converts electrical energy to sound energy
  5. State the use of a motor in a circuit
    It converts electrical energy to kinetic energy
  6. State the use of a resistor in a circuit
    It slows down moving charges in a circuit
  7. State the use of a variable resistor in a circuit
    It is used to control current by varying the resistance in a circuit without interruption
  8. State the use of an ammeter in a circuit
    It is used to measure current in a circuit
  9. State the use of a voltmeter in a circuit
    It is used to measure the voltage (potential difference) across a component
  10. State the use of an ohmmeter in a circuit
    It is used to measure resistance in a circuit
  11. State the use of a diode in a circuit
    It allows current to flow in one direction only
  12. State the use of an LED in a circuit
    It gives off light when current flows through it
  13. State the use of an LDR in a circuit
    It is a light controlled variable resistor that changes resistance in response to light
  14. What is current?
    This is a measure of the number of electrons flowing along the wire
  15. State the SI unit for current
    The amp and its symbol is the letter A
  16. How is current measured?
    Using an ammeter
  17. List the effects of electricity
    Heating eg. in kettles and heaters

    Magnetic eg. in electromagnets

    Chemical eg. in the electrolysis (splitting) of water
  18. What is resistance?
    This is a measure of how difficult it is for an electric current to pass through a substance
  19. State the SI unit for resistance
    The ohm and its symbol is Ω
  20. How is resistance measured?
    Using an ohmmeter
  21. What is voltage?
    This is a measure of the ability of the electrons to do a particular task
  22. State the SI unit for voltage
    Volts and its symbol is the letter V
  23. How is voltage measured?
    Using a voltmeter
  24. Explain a series circuit
    This is when the components are connected in a single loop
  25. If a bulb goes out in a series circuit will all the other bulbs stay lit or go out?
    They will go out
  26. Explain a parallel circuit
    This is when the components are connected in different branches
  27. If a bulb goes out in a parallel circuit will all the other bulbs stay lit or go out?
    They will stay lit
  28. State Ohm's Law
    This states that voltage is directly proportional to current at a constant temperature

    This means that when one doubles, so does the other
  29. Explain how a person could verify Ohm's Law
    It can be verified by showing that a graph of one against the other gives a straight line through the origin
  30. How is current calculated?
    Current = Voltage ÷ Resistance
Author
mshowley
ID
340444
Card Set
Science - Electric Circuits
Description
Electric Circuits
Updated

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