Cambridge IGCSE Physics4.3 Electrical circuits Checklist

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What's on this checklist

Core

  • I can draw and interpret circuit diagrams containing cells, batteries, power supplies, generators, potential dividers, switches, resistors (fixed and variable), heaters, thermistors (NTC only), light-dependent resistors (LDRs), lamps, motors, bells, ammeters, voltmeters, magnetising coils, transformers, fuses and relays, and I know how these components behave in the circuit.
  • I know that the current is the same at every point in a series circuit.
  • I know how to construct and use series circuits and parallel circuits.
  • I can calculate the combined e.m.f. of several sources connected in series.
  • I can calculate the combined resistance of two or more resistors connected in series.
  • I can state that, in a parallel circuit, the current from the source is larger than the current in each branch.
  • I can state that the combined resistance of two resistors in parallel is less than the resistance of either resistor on its own.
  • I can state the advantages of connecting lamps in parallel in a lighting circuit.
  • I know that, for a constant current, the p.d. across an electrical conductor increases as its resistance increases.

Extended

  • I can draw and interpret circuit diagrams containing diodes and light-emitting diodes (LEDs), and I know how these components behave in the circuit.
  • I can recall, and use in calculations, the facts that:a)in a parallel circuit, the sum of the currents entering a junction is equal to the sum of the currents leaving itb)in a series circuit, the total p.d. across the components is equal to the sum of the individual p.d.s across each componentc)the p.d. across an arrangement of parallel resistances is the same as the p.d. across one branch of that arrangement
  • I can explain that the sum of the currents into a junction is the same as the sum of the currents out of it.
  • I can calculate the combined resistance of two resistors in parallel.
  • I can describe the action of a variable potential divider.
  • I can recall and use the equation for two resistors used as a potential divider, V₁/R₁ = V₂/R₂.