Electric Power, Circuits, Resistors, Light Bulbs - Physics

The two or three electrical power formulas are derived from voltage, current and resistance using Ohm's law, and electric potential energy, including how to calculate it from class 10 physics and the unit. A simple circuit with 4 basic components is used as an example, including a device that changes energy to light energy and an open switch. Series and parallel circuits, and flowing movement of electricity are background knowledge.