Nichrome wire with a length of 8m and a cross-sectional area of 0.05 mm2, find the current power if it is plugged into a 220V DC outlet.

univerkov | February 22, 2021 | education

Initial data: l (length of nichrome wire) = 8 m; S (cross-sectional area of nichrome wire) = 0.05 mm ^ 2; U (voltage at the DC socket) = 220 V.

Constants: ρ (specific resistance of nichrome) = 1.1 Ohm * mm ^ 2 / m.

1) Determine the resistance of nichrome wire by the formula: R = ρ * l / S = 1.1 * 8 / 0.05 = 176 Ohm.

2) We calculate the power of the electric current: P = U ^ 2 / R = 220 ^ 2/176 = 275 W.

Answer: The current power is 275 W.

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