question_answer 8)

A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0°C? Temperature co-efficient of resistance of nichrome averages over the temperature range involved is .  

Answer:

                  and                 Using we get                                   i.e.                 or