GEOLOGY

Detailed explanation-1: -There must be a closed conducting loop from the positive to the negative terminal in order to establish a circuit and to have a current.

Detailed explanation-2: -To produce an electric current, three things are needed: a supply of electric charges (electrons) which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges. The pathway to carry the charges is usually a copper wire.

Detailed explanation-3: -Current can only flow in a closed circuit. A circuit is closed when there is no obstruction to the flow of electric current through the circuit. Q.

Detailed explanation-4: -In order for a current to flow, the circuit must be closed; in other words, there must be an uninterrupted path from the power source, through the circuit, then back to the power source. Voltage is sometimes called electric potential and is measured in volts.

Detailed explanation-5: -A switch is a component in a circuit which is used to start or stop the flow of current in a circuit.