Question

A heating element using nichrome connected to a 230 V

Q: Answer-A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which...

At room temperature 27C, the resistance of the heating element. R27 2303.2 71.875 ohm At the steady temperature t C, the resistance Rt 2802.8 82.143 ohm Now, R2 R11 t2 - t1 82.143 71.8751 1.7 x 10-4t - 27 0.0840 x 104 t - 27 840 t - 27 t 867C

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 coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 × 10-4°C-1.

A 827°C

B 877°C

C 857°C

D 867°C

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A heating element using nichrome connected to a 230 V

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