4-ELC-02

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Outcomes

  • Pupils can explain how changing resistance changes current
  • Pupils can link voltage, current and resitance

Specification References

  • 2.12 describe the qualitative effect of changing resistance on the circuit on the current in a circuit
  • 2.15 recall and use the relationship between voltage current and reistance V=IR


Starter

Give pupils white boards ask them to draw a standard test circuit - i.e. a circuit which they can use to test any standard component (e.g. a resistor)

Pupils should include a power supply, ammeter (in series), a test component (e.g. a resistor), voltmeter (in parallel around the test component).

For bonus marks ask them to identify the positive terminal of their supply

Main Body of Lesson

  • Invesitgate three different resistors (10 ohm, 20 ohm and 30 ohm), plot an I-V graph, find the gradient, make conclusions
  • Make a 10 ohm resistor - classic. Give pupils a length of wire and ask them to make a 10 ohm resistor - either use trial and error (quick method) or plot graph of resistance against length and read off ideal value.

Plenary

Homework

Additional Information

Resources Required

12x the following:

  • 5V power supplies
  • 10 ohm resistor
  • 20 ohm resistor
  • 30 ohm resistor
  • simple ammeter
  • simple voltmeter
  • PASCO I-V sensor
  • length of wire for 10 ohm resistor challenge
  • wooden block to wind wire on
  • 2 x croc clips

Textbook References

Website References

Skills Addressed

Safety/Hazards

Notes