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CP9a-c Electricity and Circuits:Physics Revision

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Revising Physics Paper 2 (The last paper in combined syllabus). On CP9 a-c Electricity and Circuits.
Harriet Leplar
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Harriet Leplar
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CP9a-c Electricity and Circuits:Physics Revision
  1. CP9a Electric Circuits
    1. Series
        1. lamps cannot be controlled individually.
          1. If one bulb fails, all bulbs in the circuit will not work.
          2. Parallel
            1. Lamps can be controlled individually
              1. If one bulb fails, the rest could still work.
              2. Need to know symbols.
                1. Switch
                  1. Cell
                    1. Battery
                      1. ammeter
                        1. Volemeter
                          1. Lamp
                          2. Conventional Direction of current flow
                            1. negative to positive
                            2. Actual direction of current flow
                              1. positive to negative
                            3. CP9b
                              1. Current
                                1. Measured using an ammeter in series.
                                  1. ammeters can go in series because they have low resistance.
                                    1. Meausred in amperes (amps) (A)
                                      1. Ammeters show the current passing through a component in a circuit.
                                      2. Potential difference
                                        1. Measured using a voltmeter
                                          1. Voltmeters show the difference in current before the component and after the component.
                                          2. Potential difference is the same as voltage.
                                            1. Measured in Volts (V)
                                              1. The bigger the potential difference, the bigger the current.
                                            2. CP9c: Current,. charge and energy
                                              1. Charge using energy
                                                1. energy transferred = charge x potential difference
                                                  1. energy in J
                                                    1. Charge in C
                                                      1. Potential difference in V
                                                    2. Charge using current
                                                      1. Electric charge is measured in coulombs (C)
                                                        1. Can be calculated using charge= current x time
                                                          1. charge in (C)
                                                            1. Current in A
                                                              1. Time in s
                                                          2. <--- How energy is transferred in a circuit.

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