1. Demonstrate understanding of current, potential difference, e.m.f. and resistance, and use with their appropriate units.
  • Electric Current:
    • is the flow of electric charge within a circuit.
    • is measured in amperes or amps (A).
    • represents how much electric charge is passing a single point in the circuit
    • is the same at the beginning and end of a circuit.
  • Potential Difference:
    • is the difference in the energy there is to drive a current through a wire, between two points
    • is measured in volts (v)
  • E.M.F:
    • electro-motive force (e.m.f) is the voltage (potential) that a battery will supply to the entire circuit
    • is the driving force that gives the electrons the energy to move around the circuit.
  • Resistance:
    • is a measure of how difficult it is to push a current through a circuit.
    • is measured in Ohms (Ω)


  1. State that charge is measured in coulombs (C).

Charge is measured in coulombs (C).

  1. Use and describe the use of an ammeter and a voltmeter.

Ammeter is a device that measures the amount of current flowing through a circuit in amperes (amps).

Voltmeter is a device that measures the potential difference between two points in a circuit.



Notes submitted by Lintha

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