4ELEC-6

Outcomes

• Pupils can use the equation: Q = I × t
• Pupils can identify the direction of movement of charge in a wire, charge in an electrolyte and the direction of flow of conventional current

Specification References

2.16 understand that current is the rate of flow of charge

2.17 recall and use the relationship between charge, current and time : charge = current × time

2.18 recall that electric current in solid metallic conductors is a flow of negatively charged electrons

Starter

• Demonstrate potassium permanganate in amonia on filter paper, resting on a slide in an electric field. Alternatively view the movement of ions; caution contains comic sans. Recall from last lesson what current is in a wire/ metal conductor.

Main Body of Lesson

Demo: Electrolysis

• The pupils observe a 10p coin being coated with copper. Pupils to consider what is moving and where. Link to chemistry and the idea of ions.
• Does water conduct? Class discussion followed by demo with distilled water and "sea" water. What's the difference and how does this allow charges to flow? Can do some Q=It practice too with the results.

Plenary

• Class act as charges in a circuit. Which way would they move if they were i) positive ii) negative? What happens in a solid and a liquid?

=Homework

• To read pages 176-180 in Complete Physics and to write an analogy for current, voltage and resistance in a series circuit.

Additional Information

Resources Required

• Movement of ions demo with potassium permanganate and amonia.

• Demo electrolysis kits and 10pence pieces
• Distilled water and "sea water", a ciruit with an LED/bulb in to demonstrate when current is or isn't flowing, ammeter

Textbook References

• Complete Physics Pages 174-175.

Safety/Hazards

• High voltages are used to demonstarte the movement of ions. Do not switch on the power supply until the paper has been soked in ammonia.

Electricity Outline

Electricity