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Questions on Characteristic Curves - Filament Lamp

Q2.

A filament lamp rated 12 V, 1.0 A has a resistance of 4.0 when it carries no current.

(a) On the axes below, sketch the form of the current against voltage characteristic for this lamp.

    Corrct shape in one quadrant

    Symmetrical trace in other

    Plotted point (1.0, 1.2)

    Plotted point (0, 0)

    Gradient at origin of 4.0

(4 marks)

(b) The filament lamp is one example of a non-ohmic device.

(i) State what is meant by the term non-ohmic.

In a non-ohmic component V is not directly proportional to I - in other words the resistance is not constant - it varies with potential difference applied.

(1 mark)

(ii) Name one other example of a non-ohmic device.

semiconductor diode

(1 marks)
(Total 6 marks)