What is current?

What is current?

• A. The rate of charge flow
• B. The flow of electrons in a circuit
• C. Potential difference
• D. Electrical resistance

Answer: (B)

Current is the rate at which electric charge passes a point in a circuit. In a metal wire, the moving charges are electrons, so describing current as the flow of electrons matches what physically happens on a microscopic level. Keep in mind that conventional current direction is opposite to the actual electron motion in a conductor, even though the magnitude is the same. In other contexts, charge can be carried by other carriers (ions, holes), but for a typical circuit with metal wires, electron flow is a practical and accurate description.

Current is the rate at which electric charge passes a point in a circuit. In a metal wire, the moving charges are electrons, so describing current as the flow of electrons matches what physically happens on a microscopic level. Keep in mind that conventional current direction is opposite to the actual electron motion in a conductor, even though the magnitude is the same. In other contexts, charge can be carried by other carriers (ions, holes), but for a typical circuit with metal wires, electron flow is a practical and accurate description.