Determine the resistance of the heating element of the iron, if its passport says: power 1.5 kW, voltage 220V.

To determine the resistance of the heating element of the iron, we will use the Joule-Lenz law:

P = U ^ 2 / R

where P is the power, U is the voltage across the heating element, R is the resistance of the heating element.

From this formula:

R = U ^ 2 / P

Let’s calculate the resistance:

Consider that P = 1.5 (kW) = 1.5 * 10 ^ 3 (W).

R = U ^ 2 / P = 2202 / 1.5 * 10 ^ 3 = 48400 / 1.5 * 10 ^ 3 = 32.27 (Ohm).

Answer: R = 32.27 (Ohm).