GEOLOGY

Detailed explanation-1: -As the positive test charge moves through the external circuit from the positive terminal to the negative terminal, it decreases its electric potential energy and thus is at low potential by the time it returns to the negative terminal.

Detailed explanation-2: -potential difference. Negatively-charged electrons are removed from atoms, the atoms being left as positive ions. The potential difference between the two causes the electrons to be attracted back, producing a flow of electric charge: current electricity.

Detailed explanation-3: -The equation shows that the potential is directly proportional to the amount of charge Q – as the charge increases, the potential increases, and opposite, as the charge decreases, the potential decreases.

Detailed explanation-4: -The path along which electrical charges move is called an electric circuit.