Difference between revisions of "Diode"

Revision as of 15:16, 17 November 2019

The symbol for a diode.

A diode is an electrical component which only allows electricity through in one direction.

Diodes have a low resistance in one direction but a very high resistance in the reverse direction.

The IV Graph for a diode shows that:

For a positive potential difference the current increases rapidly with an increase in potential difference
For a negative potential difference the current remains negligible and does not increase as the potential difference becomes larger.

The resistance of a diode is very low for current in the forward direction and very high in the back direction.

	Connect an ammeter in series with the diode to measure current through the diode. Connect a voltmeter in parallel with the diode to measure the potential difference across it. Use a variable resistor in series with the diode to vary the potential difference across the diode. Start with a potential difference of zero and increase the potential difference by an interval of 0.2V up to 2V. Recording the reading on the voltmeter and ammeter. Reverse the connections on the battery and repeat steps 4 and 5 to find the I-V relationship for negative potential difference and current.

@@ Line 46: / Line 46: @@
 :[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Diodes, pages 62, 68, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
 :[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Diodes; circuit symbol, page 38, GCSE Physics, Hodder, AQA '']
+====Edexcel====
+:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Diodes, page 148, GCSE Physics, Pearson Edexcel '']
+:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Diodes, page 229, GCSE Physics, CGP, Edexcel '']
+:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Diodes, page 388, GCSE Combined Science, Pearson Edexcel '']