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Switches in Circuits

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Switches in Circuits

A team is making a battery-powered warning light for a workbench. They need a switch to control when the light turns on. Use the circuit facts below to solve their design challenges. A battery supplies energy, wires make a path, and a bulb lights when the path is complete.

Read the circuit clues

A switch controls whether the circuit has a complete path. A closed switch joins the path, so current can flow. An open switch leaves a gap, so current cannot flow around the circuit. A switch does not create electricity; it controls the path. Each circuit described in the questions has one battery, one bulb and one switch.

1.The warning light is off. Which switch position should the team check first, and why?
2.Choose the best explanation: in a circuit with one battery, one bulb and one switch, what happens when the switch is closed?
  • The circuit path is complete, current can flow, and the bulb lights.
  • The battery stops supplying energy.
  • The wires disappear, so the bulb goes out.
3.True or false? Opening a switch breaks the circuit path, but it does not remove the battery from the circuit.
TrueFalse
4.Complete both statements: When the switch is open, the bulb is because . When the switch is closed, the bulb is because .
5.The team closes the switch, but the bulb still does not light. Give two possible circuit problems they could check.
6.Charlotte says, “The switch makes the electricity.” Is she correct? Explain what the switch actually does.
7.Name two everyday devices that use switches, and describe what each switch controls.
8.Tui wants the warning light to be off while the team prepares food and on when they are ready to use the workbench. Describe how the switch should be positioned at each time.
9.Design challenge: describe or draw a circuit using a battery, a bulb, wires and a switch. Explain how the switch controls the bulb. Include what happens in both switch positions.

2 printable pages

  • Switches in Circuits, page 1 of 2: Read the circuit clues

    Page 1

  • Switches in Circuits, page 2 of 2: 6. Charlotte says, “The switch makes the electricity.” Is she correct? Explain what the…

    Page 2

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