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2. A diode...

  • ...needs a small voltage across it before it will conduct current
  • ...changes resistance depending on temperature
  • ...has a current-voltage graph which is symmetrical

3. The current-voltage graph of a wire at room temperature looks like...

  • ...a curve
  • ...a straight line
  • ...a straight line to start with which then curves

4. A diode...

  • ...changes resistance if the light level changes
  • ...only lets current through in one direction
  • ...lights up

5. Current measures ...

  • ... the difference in energy between two points in a circuit
  • ... the number of coulombs of charge passing a point in a second
  • ... the amount of resistance in a circuit
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