The formula for calculating the power of electric heating: p*t
p is the power in KW (kilowatt)
t is the time in h (hour)
J is the power in (KWh kilowatt hour)
That is: 1500Wx1h=1.5KWx1h=1.5KWh.
Here the formula Substitution calculation, is in the state of continuous operation of the appliance to calculate the results.
Working Principle
The high-frequency high-frequency high current flows to the heating coil (usually made of purple copper tube) that is wound into a ring or other shape. This produces a strong magnetic beam with instantaneous change of polarity inside the coil. When a heated object, such as a metal, is placed inside the coil, the magnetic beam passes through the entire heated object, and a large corresponding eddy current is generated in the opposite direction of the heating current inside the heated object.
Because of the resistance of the heated object, a lot of Joule heat will be generated, so that the temperature of the object itself rises rapidly. To achieve the purpose of heating all metal materials.
Reference: Baidu Encyclopedia-Electric Heating