It should be divided by the square of the voltage by the resistance, which is 380*380/R
Resistance R is measured with a multimeter (current is not good to measure)
Also, the electric heating rods are two-phase, two wires are the simplest, three wires are one ground wire, four wires are two power lines plus a thermocouple, and five is a wire heating couple plus ground wire
If the size is measured, then calculate the surface area, and divide the power by the surface area is the power density
Generally, the power density of domestic electric heating rods can achieve 12W/cubic centimeter
