Difference between revisions of "3-ELE-10"

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(Homework)
(Safety/Hazards)
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===Safety/Hazards===
 
===Safety/Hazards===
 +
* Thin wires can get quite hot
  
 
===Notes===
 
===Notes===

Revision as of 04:26, 13 May 2008

Outcomes

  • Pupils can plan a Current-Voltage investigation
  • Pupils can select the correct equipment and use an appropriate circuit to take valid measurements

Specification References

2.14 recall and use the relationship between voltage, current and resistance: voltage = current × resistance

Starter

Pupils to design a circuit to design a circuit from:

a power supply, a variable resistor, an ammeter, a voltmeter, some sample wire

Pupils to consider how to make the experiment as accurate as possible

Main Body of Lesson

Planning:

  • Identify what factors could affect resistance of a wire (length, csa, material, temperature)
  • Discuss how to make the experiment fair (control variables) and accurate (several values of V and I)

Observation:

  • Pupils to investigate how length affects resistance
  • Pupils to investigate how csa affects resistance

Plenary

  • Pupils to summarise thier findings in two simple tables (length and average resistance, area and average resistance) and discuss their findings in general as a group. This will need to be finsihed prior to the following lesson for data analysis

Homework

  • Finish any unfinished tables
  • Research the concept of resistivity and find the resistivities of the following:

iron, copper, constantan, nichrome, silver, gold,

Additional Information

Resources Required

Textbook References

Website References

Skills Addressed

Safety/Hazards

  • Thin wires can get quite hot

Notes