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Circuit Parts Observation Worksheet

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Circuit Parts Observation Worksheet

Use the diagrams and clues to investigate how simple circuits work. A cell provides energy; wires connect the parts; a bulb lights only when there is a complete path. A switch opens or closes that path. Use safe, low-voltage cells only.

Spot the parts

Compare the two circuit diagrams. In Circuit A, the switch is closed. In Circuit B, the switch is open.

Circuit A: one cell, wires, one bulb and a closed switch. The wire path loops from one end of the cell, through the bulb and switch, back to the other end.

Circuit B: one cell, wires, one bulb and an open switch. The wire path has a gap at the switch.

1.In Circuit B, which part creates the gap that stops the bulb lighting?
  • The cell
  • The open switch
  • The bulb
  • The wire
2.Match each circuit part to its job.
  • Cell
  • Wire
  • Bulb
  • Switch
  • Changes electrical energy into light
  • Provides energy to the circuit
  • Connects the parts and provides a path
  • Opens or closes the circuit

Solve the workshop mystery

Rhys builds a circuit with one cell, wires, a bulb and a switch. The bulb does not light. She notices one wire has slipped away from the bulb’s metal contact.

3.Explain why the bulb is off and what Rhys should do to fix the circuit.
4.True or false: Closing a switch usually completes the circuit, allowing current to flow.
TrueFalse
5.A bulb is dimmer than expected. Name two possible things to investigate, and explain how each could affect the circuit.
6.Complete the sentence: A bulb lights when it is part of a circuit with no gaps.
7.Nia wants to test whether opening a switch affects a bulb. What should he change, and what should he keep the same to make a fair test?
8.A circuit has a cell and a bulb connected by wires, but the switch is open. Predict what happens when the switch is closed and explain why.
9.Draw a simple circuit with one cell, one bulb, connecting wires and a switch. Show the switch closed so the bulb can light. Label each part.

3 printable pages

  • Circuit Parts Observation Worksheet, page 1 of 3: Spot the parts

    Page 1

  • Circuit Parts Observation Worksheet, page 2 of 3: Solve the workshop mystery

    Page 2

  • Circuit Parts Observation Worksheet, page 3 of 3: 9. Draw a simple circuit with one cell, one bulb, connecting wires and a switch. Show the…

    Page 3

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