Basic explanation : Take the induction melting furnace as an example. For example, the induction melting furnace power is 100 units, that is, 100 units of power is delivered to the induction melting furnace . However, due to the inherent reactive losses of most electrical systems, only 70 units of power can be used. Unfortunately, although only 70 units are used, there is a fee of 100 units. In this example, the power factor is 0.7 (if most induction melting furnaces have a power factor less than 0.9, they will be fined). This reactive loss is mainly found in induction melting furnaces , also known as inductive loads. Power factor is the efficiency of the energy measurement standards.