Physics Class 12 NCERT Solutions: Chapter 3 Current Electricity Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get top class preparation for CBSE/Class-12 right from your home: get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-12.

Formula of Resistance

Q: 8. A heating element using nichrome connected to a supply draws an initial current of which settles after a few seconds toa steady value of . What is the steady temperature of the heating element if the room temperature is ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is .


Supply voltage,

Initial current drawn

Initial resistance , which is given by the relation,

Steady state value of the current,

Resistance at the steady state which is given as

Temperature co-efficient of nichrome,

Initial temperature of nichrome,

Study state temperature reached by nichrome

Can be obtained by the relation for

Therefore, the steady temperature of the heating element is

Developed by: