* Electrons are the primary carriers: Electricity in a circuit is actually the flow of electrons, tiny negatively charged particles that orbit the nucleus of an atom.
* Current is the flow: The movement of these electrons is called electric current. It's measured in amperes (A), which represents the amount of charge passing a point in a circuit per second.
* Voltage drives the flow: Voltage is the electrical potential difference between two points in a circuit. Think of it like a pressure difference that pushes the electrons along. It's measured in volts (V).
* Resistance opposes the flow: Resistance is the opposition to the flow of current. It's measured in ohms (Ω). Think of it like friction slowing down the electrons.
So, to summarize, the electricity that travels through a circuit is actually the movement of electrons, driven by voltage and opposed by resistance.
