Electromagnetism is a branch of physics that studies the electromagnetic force, which is the interaction between electrically charged objects. It is one of the four fundamental forces in nature, along with gravity, the strong force, and the weak force. The other three forces are electrical in nature and occur between the matter and the movement of the electrical charges. The electromagnetic force is responsible for the phenomena of light, magnetism, and electricity.

A current is an electric current flow. When an electric current flows, it carries electrical charges. When the current is too large, the charges can no longer follow the path of the current and they will be forced to travel around the circuit. This is called an electrical circuit and the current is the voltage in the circuit. The flow of current in a circuit is determined by the voltage and the resistance of the circuit. The larger the voltage, the greater the current flow, and the more power is consumed by the circuit. The power supply of an electrical circuit is limited by the voltage that it can handle. The power supply is the device that is able to increase the voltage in the circuit. It is also called a power source.

Electromagnetism is a very important field of study. Electromagnetism studies the way that the electromagnetic field affects the physical world. This includes the generation of electric and magnetic fields. The fields can be used for a variety of purposes such as the generation of power, the transmission of information, and the control of physical processes.