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Exploring Electrical Circuits

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Exploring Electrical Circuits

A community science centre is setting up a safe, battery-powered display. Solve the circuit puzzles, interpret the circuit details, and plan a lighting circuit. Use only low-voltage cells in classroom investigations; never experiment with mains electricity.

Circuit detectives

Use these circuit details to answer Questions 1–3: a cell, a lamp, and an open switch are connected by wires in one loop. The open switch leaves a gap, so the circuit is incomplete.

1.The switch is open. Will the lamp light? Explain what happens to the electric current.
2.Name the energy source and the component that changes electrical energy into light in this circuit.
3.Choose the best prediction: what should happen when the switch is closed, assuming the cell and lamp work and the wires are connected properly?
  • The lamp lights because the loop is complete.
  • The lamp stays off because a closed switch blocks current.
  • The cell changes into a conductor.
  • The wires stop carrying current.

Materials and current

A group tests objects by putting each one into a gap in a simple cell-and-lamp circuit. They record whether the lamp lights.

4.Sort these objects into likely conductors and likely insulators: copper wire, aluminium foil, plastic ruler, rubber band. Give two examples in each group.
5.A metal spoon lights the lamp, but a dry wooden stick does not. What does this evidence suggest about the spoon and the stick?
6.True or false: In a series circuit, removing one lamp breaks the single path, so all the lamps go out.
TrueFalse
7.Two identical lamps are added in series to the same cell. Compared with one lamp, what usually happens to each lamp's brightness? Explain briefly.

Design for the display

The centre wants two lamps that can be controlled independently, so switching one lamp off does not turn the other off.

8.Which arrangement best meets the centre's needs?
  • Two lamps in series with one switch.
  • Two lamps in parallel, each branch with its own switch.
  • Two lamps in series, each connected to a different cell with no wires.
  • One lamp with two switches placed across a gap.
9.Draw a circuit using a battery, two lamps in parallel, and one switch in series with each lamp. Label the battery, lamps, switches, and connecting wires.

Numbers in a circuit

Use the relationship voltage = current × resistance (V = I × R). Rearrange it when needed. Include the unit in your answer.

10.A small lamp has a voltage of 3 V across it and a current of 0.5 A through it. Calculate its resistance.
11.A component has a resistance of 4 Ω and a current of 0.75 A. Calculate the voltage across it.
12.A student plans to test how adding lamps in series affects brightness. Name one variable to change, one result to measure, and one factor to keep the same for a fair test.

3 printable pages

  • Exploring Electrical Circuits, page 1 of 3: Circuit detectives

    Page 1

  • Exploring Electrical Circuits, page 2 of 3: Materials and current, Design for the display

    Page 2

  • Exploring Electrical Circuits, page 3 of 3: Numbers in a circuit

    Page 3

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