The coil of the electric heater (220V) is made of nichrome wiring 22.6 meters long
| June 15, 2021 | education
The coil of the electric heater (220V) is made of nichrome wiring 22.6 meters long and has an area. cross section 0.7 mm ^ 2. Determine the resistance of the conductor.
L = 22.6 m.
S = 0.7 mm2.
ρ = 1.1 Ohm * mm2 / m.
R -?
The resistance R of a uniform cylindrical conductor with a length L and a cross-sectional area S is determined by the formula: R = ρ * L / S, where ρ is the resistivity of the substance from which the conductor is made.
We take the specific resistance of nichrome from the table of specific resistance of substances: ρ = 1.1 Ohm * mm2 / m.
R = 1.1 Ohm * mm2 / m * 22.6 m / 0.7 mm2 = 35.5 Ohm.
Answer: R = 35.5 ohms.
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