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Solution


Q.

Which of the following obeys Ohm’s law
1 Filament of a bulb  
2 LED  
3 Nichrome  
4 Transistor  

Ans.

(3)

In conductors, resistance remains constant when the current passing through them is increased; they are known as Ohmic conductors. Nichrome, which is an alloy, is made in such a way that its resistance remains constant for a wide range of temperatures. Hence, nichrome obeys Ohm’s Law. Whereas, transistor, LED, bulb filament do not obey Ohm’s law because with the varied change in temperature, their resistance changes.