Electricity

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Electricity
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Previous knowledge

• Atomic structure OC 39
• Static electricity OP 48

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Teaching and learning issues

• Misconceptions are plentiful
• partial understanding
• simple ideas
• wrong track
• right lines

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Starting point

• Where students are now
• Probes

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Wrong track Right lines

• no gaps in a complete circuit
• energy comes from a battery
• electricity flows
• charged particles travel
• add a battery for a brighter bulb
• extra battery gives more energy
• battery runs out of energy

• battery stores electricity
• electricity from both ends of the battery
• electricity is used up
• battery runs out of charged particles
• battery runs out of electric current

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Pupils need to

• Understand and be able to measure
• current
• potential difference (Voltage)
• resistance
• Establish the relationship between them
• (OP50)

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Pupils need to

• Be able to picture what is going on
• as charged particles gain energy from the battery
  and move in the circuit
• as energy is converted in those parts of the
  circuit with resistance.
• as energy is transferred to and from charged
  particles as they move in the circuit

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Starter activities

• Class practical activity
• capture interest
• review the idea of a complete circuit
• encourage pupils to talk and think about simple
  electric circuits
• engage pupils designing and making circuits

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Next activity-the Big Circuit

• Having had a chance to think through their
  ideas pupils are shown a circuit. The Big Circuit
• The size of the circuit highlights the need for
  some transport mechanism to transfer energy from
  the battery to the bulb

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Next activity -Supermarket vans analogy

• Provides a way of helping pupils to develop an
  understanding of abstract concepts such as
  energy, charged particles and current, by
  relating them directly to familiar everyday
  objects (such as supermarket delivery vans)

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Empty vans collect bread at the bakery
The empty vans go back to the bakery to get more
bread
Each van takes the bread to the supermarket
The vans deliver the bread to the supermarket
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Next activity Rope Analogy

• Provides a way of helping pupils to develop an
  understanding of abstract concepts (charged
  particles, current, resistance) by relating them
  directly to the movement of a rope round a loop.

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Energy is transferred
Chemical energy converted to electrical energy in
battery
There is a continuous and steady flow of charges
in all parts of the complete circuit