How long should a nichrome conductor with a diameter of 1.2 mm be taken for an electric oven so that when it is connected to a 220 V network, the current strength is 5A
Let’s find the resistance of the thread, according to Ohm’s law R = U / I, where U is the voltage I the current strength.
R = 220/5 = 44 ohms.
The resistance of a conductor with a length l is determined by the formula R = ρ * l / S where ρ is the resistivity (for nichrome 1.2 Ohm * mm ^ 2 / m), then:
l = R * S / ρ = 44 * 1.2 / 1.2 = 44 m.
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