The spiral of the hot plate is made of nichrome wire 25 m long and 1 mm in diameter. What is the resistance of the spiral?

Initial data: l (length of nichrome wire) = 25 m; D (cross-sectional diameter of nichrome wire) = 1 mm.

Reference data: ρ (resistivity of nichrome) = 1.1 Ohm * mm ^ 2 / m.

1) Calculate the cross-sectional area of the nichrome wire:

S = 1/4 * Π * D ^ 2 = 1/4 * 3.14 * 1 ^ 2 = 0.785 mm ^ 2.

2) Determine the resistance of the electric stove spiral:

R = ρ * l / S = 1.1 * 25 / 0.785 = 35 ohms.

Answer: The coil of the electric cooker has a resistance of 35 ohms.