What is the resistance of a spiral of an electric hotplate made of constrantan, if its length is 25m and a cross-section of 0.5mm?
Calculate the spiral resistance of an electric hotplate using the following formula:
R = ρ * l / S, where ρ is the resistivity of constantan (at a temperature of 20 ºС ρ = 0.5 Ohm * mm2 / m), l is the length of the tile spiral (l = 25 m), S is the cross-sectional area of the spiral (S = 0.5 mm2).
We calculate the resistance of the electric stove spiral:
R = ρ * l / S = 0.5 * 25 * 0.5 = 25 ohms.
Answer: The coil resistance of an electric hotplate is 25 ohms.
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