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In this video I will explain in order for current flow through a circuit two things are need. First, a voltage supply, something that will product a potential difference across a circuit and; second, a complete circuit where a current can flow without a break. The voltage source creates a potential difference across the circuit. The potential difference produces an electric field. The charges in the conductor experience a force.
And that force pushes the charges through the circuit producing a current.

Next video in this series can be seen at:
https://youtu.be/euVoSumiNk8