Electric current needs a complete circuit to flow. It will then flow continuously until the circuit is broken, e.g. a switch is opened 9turned off).
Current is the rate of the flow of electrons in a component. Electrons have a negative charge. In a complete circuit they leave the negative terminal because they are attracted towards the positive terminal. The greater the flow of electrons (i.e the more electrons per second) the greater the current.
When the current is flowing, energy is transferred from the cell to the circuit componenets (devices). The electric current will flow through an electrical component if there is a voltage (potential difference p.d) across the ends of the component.
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