Posterous theme by Cory Watilo

2.11

Subject: 2.11

2.11 ideal results

14 January 2011

16:20

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2.11 notes

24 November 2010

10:15
· 2.11 describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how this can be investigated experimentally

Wires and resistors
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· Ohm's Law = "I is directly proportional to V for a conductor at constant temperature"
· Wires and resistors obey Ohm's Law so we say they are "Ohmic" components

Filament lamp


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Diode
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· For a diode the graph is NOT a straight line so I is NOT directly proportional to V
· Because it does not obey Ohm's Law so we say that it is a "Non-ohmic" component

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V-I graphs - model results and graph.xlsx (13 KB)
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