Here's why:
* Potential difference (voltage) is the difference in electric potential between two points in a circuit. This difference in potential is what drives the flow of electric current.
* Voltage sources are devices designed to maintain a constant potential difference across their terminals. Common examples include:
* Batteries: They convert chemical energy into electrical energy, creating a potential difference.
* Power outlets: They provide a potential difference from the electrical grid.
* Generators: They convert mechanical energy into electrical energy, producing a potential difference.
Without a voltage source, there wouldn't be any driving force to push charges through the circuit, and hence no current would flow.
