An electric hotplate, when connected to a network with a voltage of 220 V, consumes a current of 1.5 A, the spiral of the tile is made of nichrome wire with a cross-sectional area of 0.15 mm. how long is the wire?
Determine the resistance of an electric stove using Ohm’s law.
R = U / I = 220 / 1.5 = 146.67 Ohm.
According to the reference book, the resistivity of nichrome wire is equal to: ρ = 1.1 Ohm * mm2 / m.
The resistance of the wire is: R = ρ * L / S, where ρ is the resistivity of the conductor, L is the length of the conductor, S is the cross-section of the conductor.
146.67 = 1.1 * L / 0.15.
L = 146.67 * 0.15 / 1.1 = 20 m.
Answer: The length of the wire is 20 m.
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