What is the movement of invisible particles that causes electrical devices to operate called?

The movement of invisible particles that causes electrical devices to operate is known as current. Current refers to the flow of electric charge, typically carried by electrons in a conductor. This flow of charge is essential for the operation of electrical devices, as it allows for the transfer of energy that powers everything from light bulbs to motors.

In a circuit, this movement is made possible by a difference in voltage, which provides the potential energy needed for current to flow. Resistance, on the other hand, opposes the flow of current, while voltage is the measure of electrical potential difference and does not directly refer to the movement itself. Hence, understanding current as the movement of charge is key to comprehending how electrical devices function effectively.