GCSE Physics (AQA)

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Introduction to Circuits

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Electricity Current, potential difference and resistance

Introduction to Circuits

7:47 Circutis, Charge and Current
Spec 4.2.1.1 4.2.1.2 4.2.2
Previous Solar Energy Next Electric Charge
  • Circuits carry electrical current from a power source to components.
  • Example circuit includes a cell (power source), a lamp (powered component), and a switch (controls circuit).
  • Components are connected by electrical conductors, typically metal wires insulated with plastic.
  • A complete loop from the power source is necessary for current flow.
  • Circuits can have branching paths but must not allow current to return on itself.
  • A closed loop is essential for current flow; breaking the loop stops the current.
  • Circuit diagrams use symbols to represent components and connections.
  • Symbols include lines and a plus for a cell, a circle with a cross for a bulb, and two circles with a line for a switch.
  • Recognizing and drawing circuit symbols is important for exams.
  • Cells generate electric currents using chemical energy and have positive and negative terminals.
  • Batteries consist of two or more cells connected in series for more power.
  • Switches manually break or complete a circuit to control current flow.
  • Lamps illuminate when current flows through them, heating the filament to emit light.
  • Components can be arranged in series (same branch) or parallel (separate branches).
  • Series arrangement means all components are on the same path; parallel means separate paths.

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