Electric Current, Example Problems

Published: 30 June 2019
on channel: Step by Step Science

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How to calculate electric current, example problems.

Electric current is the rate of flow of charge past a point in a closed circuit. In an electric circuit this charge is carried by electrons moving through a wire but it can also be carried by ions in an electrolyte.

The symbol for current is I, which originates from the French phrase intensité du courant (current intensity). The SI unit of electric current is the ampere (A). One ampere is equal to one coulomb per second. Electric current is measured using a device called an ammeter

In a conductor the negatively charged electrons are the charge carriers and are free to move about in the metal. A flow of positive charges gives the same electric current, and has the same effect in a circuit, as an equal flow of negative charges in the opposite direction. The direction of conventional current is defined as the same direction as positive charges flow. Since electrons, the charge carriers in metal wires and most other parts of electric circuits, have a negative charge they flow in the opposite direction of conventional current flow in an electrical circuit.

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Chapters:
0:00 Example Problems
0:36 Example No. 1, Fill in the Blank
1:50 Example No. 2, Fill in the Blank
4:10 Example No. 3, Calculation
5:00 Example No. 4, Calculation
5:50 Example No. 5, Calculation
6:50 Example No. 6, Calculation

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