Physics Current and Voltage Characteristics

The main points of the characteristics between Current and Voltage

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Filament Lamp

For a filament lamp, the graph curves because as the filament heats up, its resistence heats up too. As voltage goes up, current decreases.

(http://physicsnet.co.uk/wp-content/uploads/2010/06/VI-graph-for-filament-lamp1.jpg)

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Resistor

For a resistor current is directly proportional to the voltage.

(http://physicsnet.co.uk/wp-content/uploads/2010/06/VI-graph-for-resistor1.jpg)

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Diode

Since current is only allowed in one direction through a diode, the graph will only be active on either the positive or negative side.

VI graph for filament diode (http://physicsnet.co.uk/wp-content/uploads/2010/06/VI-graph-for-filament-diode.jpg)

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Diode cont...

If voltage increased enough, the diode conducts in other direction (Break Down Voltage).

break down diode (http://physicsnet.co.uk/wp-content/uploads/2010/08/break-down-diode.jpg)

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Thermistor

Resistance decreases as temperature increases.

thermistor graph (http://physicsnet.co.uk/wp-content/uploads/2010/06/thermistor-graph-300x269.jpg)

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LDR – Light Dependant Resistor

Resistance decreases as light intensity increases.

LDR graph (http://physicsnet.co.uk/wp-content/uploads/2010/06/LDR-graph-291x300.jpg)

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