Usually, we will find that series resonance (also known as series resonance test device) has similar related characteristics of the power supply, and the reason for its similar related characteristics is also due to its own basic circuit structure. For a current source, its characteristic is that the current value it outputs is not affected by external loads and is only related to its own factors.

And for the voltage source, its output voltage is also related to its own factors, and has no relationship with other external loads. At the same time, they will not be affected by external loads or factors that cause changes in voltage and current. Simply put, as long as they do not change themselves, the values they output are constant.

Usually, when we refer to a component with similar power characteristics, it means that its output power is independent of other external factors or has little relationship with other load factors. Therefore, we call it a component with similar power characteristics. Why does series resonance have similar characteristics to power sources? This is also due to the fact that the voltage or current output by a series resonant circuit is independent of the external load, and will not change due to changes in the external load, so it has similar characteristics to a power supply.

This related characteristic is also an inevitable result of the particularity of series resonant circuits. The specific power related characteristics of series resonance are due to its average current value being independent of its voltage value. Its average current value will not change due to changes in its output voltage. As mentioned earlier, the circuit that undergoes series resonance has a certain particularity, that is, its capacitance and inductance have the same voltage value, which means that no matter how the resistance changes, it will not cause the average value of the voltage and current output by this circuit to change.