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Introduction to Electricity

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Introduction to Electricity

A storm has knocked out power at a picnic site. Help the team investigate electricity and decide how to make a safe, working circuit. Use the passage and the circuit description to answer the questions. Never experiment with mains electricity.

Electricity in action

Read the short briefing, then answer Questions 1–3. Electricity is linked to tiny particles called electrons. In some materials, electrons can move from atom to atom. When they flow steadily through a complete path, we call this an electric current. A battery provides energy to push the current around a circuit. A lamp lights only when its circuit is complete. Opening a switch breaks the path and turns the lamp off. Rubbing two materials together can also move electrons from one surface to the other. This can create a build-up of electric charge, called static electricity. A charged balloon may attract tiny bits of paper. Static charge is different from the steady current flowing through a circuit.

1.Which statement best describes an electric current?
  • A steady flow of electrons through a complete path
  • A collection of tiny bits of paper
  • Energy stored only in a lamp
  • A material that blocks all charge
2.Explain one difference between static electricity and the current in a working circuit.
3.A rubbed balloon attracts small paper scraps. What has built up on the balloon?

Build the picnic lamp

Circuit description: A battery, a lamp and connecting wires form one complete loop. One wire connects one battery terminal to one lamp contact; another wire connects the other lamp contact to the other battery terminal. The loop is closed, with no gaps, so current can flow through the lamp.

4.The lamp stops glowing when one wire is disconnected. Explain why.
5.The team adds a switch. What must the switch do for the lamp to glow?
  • Close the circuit and complete the path
  • Cover the lamp with an insulator
  • Remove the battery
  • Make the wires longer

Choose safe materials

The picnic team needs to choose materials for the outside of a pretend low-voltage test lead. Conductors allow electric current to pass through more easily; insulators resist the flow of current. Many metals are conductors, while rubber and plastic are commonly used as insulators.

6.Match each material to its usual group.
  • Copper
  • Rubber
  • Aluminium
  • Plastic
  • Insulator
  • Insulator
  • Conductor
  • Conductor
7.Why are wires often made with metal inside and plastic around the outside?
8.A picnic helper suggests testing the lamp by plugging the circuit into a wall socket. Is this safe? Give a reason.
TrueFalse
9.The lamp still does not glow, even though the circuit looks complete. Name one thing the team could check in its low-voltage battery circuit.
10.Invent one safe investigation the team could do to find out whether an object is a conductor. State what they would change and what result would show the object conducts.

3 printable pages

  • Introduction to Electricity, page 1 of 3: Electricity in action

    Page 1

  • Introduction to Electricity, page 2 of 3: Build the picnic lamp, Choose safe materials

    Page 2

  • Introduction to Electricity, page 3 of 3: 9. The lamp still does not glow, even though the circuit looks complete. Name one thing…

    Page 3

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