An electric cooker is connected to an ammeter. Will the value shown by the ammeter change if we put cold air on it?

BR Brenttolmie asked on 02 February 2020, 07:38
1 answers / 452 views / 3 votes
ST

Assuming the heating element is made of nichrome. Nichrome has a positive temperature coefficient of resistance. This means the hotter it is, the higher its resistance is. Blowing cold air on it will cause the resistance to drop and consequently the current draw will increase.

If the heating element is made from a material with a negative temperature coefficient of resistance, cold air would make the current decrease.

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