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10.1 Circuits, charge and current

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Question 11

An indicator LED flashes while connected to a supply. The data for the LED are shown in the table.

QuantityValue
Current in the LED0.020 A
Duration of one flash0.50 s
Potential difference across the LED3.0 V
Total charge passing through the LED during a sequence of flashes2.4 C

Use the equations Q=ItQ=ItQ=It and E=QVE=QVE=QV.

a.

Calculate the amount of charge transferred in a single flash.

[2]
b.

Calculate the energy transferred to the LED during the sequence of flashes.

[2]
Markscheme

10.1 Circuits, charge and current Questions

  1. GCSE
  2. /Physics
  3. /10.1 Circuits, charge and current

94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.

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