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Brainlag Learn / GCSE Physics

Electric circuits

Circuit symbols, charge and current, V = IR, I-V graphs, series and parallel circuits, and sensing circuits with LDRs and thermistors.

Lessons

  1. Circuit symbols, charge and currentThe symbols you draw circuits with, what a current is, and Q = It with the unit traps examiners like. 20 min, free
  2. Potential difference and resistanceWhat potential difference and resistance are, V = IR in every arrangement, and working in kΩ and mA. 20 min, with the Ohm's Law and Circuits Calculator, free
  3. Current-potential difference graphsThe I-V graphs of a resistor, a filament lamp and a diode, finding resistance from them, and the I-V required practical. 25 min, with the Series and parallel circuits simulation, Plus
  4. Series circuitsOne loop: the same current everywhere, the supply p.d. shared out, and resistances that add. 20 min, with the Series and parallel circuits simulation, Plus
  5. Parallel circuitsBranches: the same p.d. across each, currents that add at a junction, and a total resistance smaller than any branch. 20 min, with the Ohm's Law and Circuits Calculator and the Series and parallel circuits simulation, Plus
  6. Sensors and the resistance practicalLDRs and thermistors in sensing circuits, how the meter readings change, and the required practical on the resistance of a wire. 25 min, Plus

Practise and test

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