Electric current is a key concept in the field of electrical engineering. It refers to the flow of electric charge through a conductor, such as an electrical wire or circuit board. The amount of electrical current that flows through an object is determined by its resistance and voltage applied across it. Current can be either direct current (DC) or alternating current (AC).

The SI unit for measuring electric current is amperes (A). Electric currents are generated when electrons move from one atom to another within a material, usually metals such as copper and aluminum. This movement creates what’s known as electron drift velocity which causes electricity to flow in one direction within the material – this constitutes DC electricity. On the other hand, AC electricity occurs due to fluctuations between positive and negative charges at high frequencies over time which results in waveforms with peaks and troughs – this type of energy can be used for powering appliances like refrigerators or TVs because it has greater efficiency than DC power sources alone.

In summary, understanding how electric currents work helps us take advantage of their capabilities both practically and theoretically; they enable us not only use them directly but also understand more complex phenomena related to electromagnetism like induction motors or transformers that are essential components found in most electronic devices today!

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