0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

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 27.0oC? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70×104oC1.

Solution
Verified by Toppr

V=230 volts
Initial current, I1=3.2 A
R=V/I1=71.9Ω
steady state current,
I2=2.8 A
R2=230/2.8=82.14Ω
α=1.7×104,T1=27oC
coefficient of resistanceα=R2R1R1(T2T1)
T2=867.5oC

Was this answer helpful?
164
Similar Questions
Q1
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 27.0oC? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70×104oC1.
View Solution
Q2
The resistance of wire in a heater at room temperature is 65Ω. When the heater is connected to a 220V supply the current settles after a few seconds to 2.8A. What is the steady temperature of the wire. (Temperature coefficient of resistance α=1.70×104 oC1)
View Solution
Q3
A heating element has a resistance of 100Ω at room temperature. When it is connected to a supply of 220 V, a steady current of 2A passes in it and temperature is 500C more than room temperature. What is the temperature coefficient of resistance of the heating element?
View Solution
Q4
A nichrome element has a resistance of 75.3Ω at 27C. When 230 V p.d is applied and a study state temperature is reached, the current flowing through it is 2.68 A. If =1.7×104C1, find the steady state temperature
View Solution
Q5
At room temperature (27.0oC) the resistance of a heating element is 100Ω . What is the temperature of the element if the resistance is found to be 117Ω, given that the temperature coefficient of the material of the resistor is 1.70×104C1.
View Solution