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Questions on Characteristic Curves - Filament Lamp

Q4. The characteristic shown below is that of a filament lamp.

(a) Explain why, as the voltage is increased either positively or negatively from zero, the characteristic has the form shown in the diagram

(5 marks)

(b) At a certain point on the characteristic, the power developed in the lamp is 20 W and the current is 90 mA. Calculate the resistance of the filament at this point on the characteristic.

(2 marks)

(Total 7 marks)