* Electric Potential: Think of it like the "pressure" pushing electrons through a circuit.
* Difference: Voltage measures the *difference* in potential between two points. It's like measuring the height difference between two hills, which determines how much potential energy a ball rolling down has.
* Units: Voltage is measured in volts (V).
Think of it this way:
* Battery: A battery has a voltage difference between its positive and negative terminals. This difference pushes electrons through the circuit.
* Outlet: A wall outlet has a voltage difference, usually 120V in the US, that powers appliances.
* Lightbulb: The voltage difference across a lightbulb causes electrons to flow, making it glow.
Key things to remember about voltage:
* Higher voltage = More energy: A higher voltage difference means a greater push on the electrons, resulting in more power being delivered.
* Direction: Voltage is a *directional* quantity, meaning it has a positive and a negative side. The direction indicates which way the electric field is pointing and the direction of the potential difference.
Hopefully, this explanation helps clarify what the voltage sign means!
