From the course: Electronics Foundations: Fundamentals

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Resistance and Ohm's Law

Resistance and Ohm's Law

From the course: Electronics Foundations: Fundamentals

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Resistance and Ohm's Law

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- As electric current passes through a conductive material like a copper wire, that wire actually pushes back against the flowing electrons to oppose their movement. Like how the force of friction opposes the movement of physical objects. That opposition to electric current is called resistance. Using the analogy to relate electricity to the water flowing through this hose, you can think of this faucet as a constant source of pressure, which creates a voltage on the hose and causes water to flow through it representing current. The diameter of the hose is directly related to its resistance. When I hold the hose straight and open like this, the current flows through more or less freely. But if I put a bend in the hose, that increases its resistance and restricts the flow of current. In electrical systems resistance described how much an object resists the flow of electric current. And we measure resistance using units…

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