THE FILAMENT LAMP Circuit Forward characteristic Reverse

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Presentation transcript:

THE FILAMENT LAMP Circuit Forward characteristic Reverse

A V + 12 volt d.c. supply _ Ammeter Filament lamp A Variable resistor 61mA 54mA 0mA 42mA 25mA A Variable resistor 6.0V 4.5V 0.0V 1.5V 3.0V V V Voltmeter previous next smart

Potential Difference (volts) Current (m A) A 0.0 25 1.5 V 42 3.0 4.5 _ + Potential Difference (volts) Current (m A) 54mA 25mA 61mA 63mA 0mA 42mA A 0.0 25 1.5 4.5V 3.0V 7.5V 6.0V 0.0V 1.5V V 42 3.0 4.5 54 6.0 61 7.5 63 Turning the battery round makes the current flow the other way through the lamp and this gives us a graph in the bottom left quadrant of the graph paper

previous next smart

Potential Difference (volts) Current (m A) A 0.0 -25 -1.5 V -42 -3.0 _ + Potential Difference (volts) Current (m A) -54 mA -25 mA -61 mA -63 mA 0mA -42 mA A 0.0 -25 -1.5 -4.5 V -3.0 V -7.5 V -6.0 V 0.0V -1.5 V V -42 -3.0 -4.5 -54 Turning the battery round makes the current flow the other way through the lamp and this gives us a graph in the bottom left quadrant of the graph paper -6.0 -61 -7.5 -63

Current (I) in mA Forward characteristic p.d. (V) in volts Reverse previous next smart