The spiral of an electric hotplate is made of nichrome wire 13.75 m long and a cross-sectional area of 0.1 mm2
| April 5, 2021 | education
The spiral of an electric hotplate is made of nichrome wire 13.75 m long and a cross-sectional area of 0.1 mm2. The tile is designed for a voltage of 220V. Determine the current in the spiral of the tile.
Data: l (length of consumed nichrome wire) = 13.75 m; S (section) = 0.1 mm2; U (rated voltage) = 220 V; ρн (specific electrical resistance of nichrome; t = 20 ºС) = 1.1 Ohm * mm2 / m.
Coil current: I = U / R = U * S / (ρn * l) = 220 * 0.1 / (1.1 * 13.75) = 1.45 A.
Answer: The current in the spiral of the indicated tile is 1.45 A.
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