Basic Knowledge of Electric Circuits (Circuits)

This chapter provides a brief introduction of electric circuits and the components used in the circuits, electric, and magnetic fields. In a circuit, the power supply can be direct current – DC – or alternating current – AC. The frequency of DC power source is zero, and the battery is DC supply. The frequency of AC power source is not zero, and the wall power is AC supply. In an AC circuit, in addition to resistors, two other components also need to be taken into consideration. Resistors, capacitors, and inductors are the most basic components that make up a circuit. They are passive components. Tesla's most important contribution was the invention of AC technology. This was also the main argument between him and the great American inventor Thomas Edison.