![]() ![]() Letter used to represent that quantity in an algebraic equation. The "symbol" given for each quantity is the standard alphabetical Here are the standard units of measurement forĮlectrical current, voltage, and resistance: "pound" or "gram." For temperature we might use degrees Fahrenheit orĭegrees Celsius. Way that we might quantify mass, temperature, volume, length, or any To be able to make meaningful statements about these quantities inĬircuits, we need to be able to describe their quantities in the same Resistance are often stated as being "between" or "across" two points For this reason, the quantities of voltage and Just like voltage, resistance is a quantity relativeīetween two points. In a circuit depends on the amount of voltage available to motivate theĮlectrons, and also the amount of resistance in the circuit to opposeĮlectron flow. ![]() Without reference to two particular points, the term "voltage" has no meaning.įree electrons tend to move through conductors with some degree ofįriction, or opposition to motion. ![]() Of how much potential energy exists to move electrons from one particular point in that circuit to another particular point. Voltage being present in a circuit, we are referring to the measurement Voltage is a specific measure of potential energy that is always The force motivating electrons to "flow" in a circuit is called voltage. This continuous movement ofįree electrons through the conductors of a circuit is called a current, and it is often referred to in terms of "flow," just like the flow of a liquid through a hollow pipe. Volume I - DC » OHM's LAW » How voltage, current, and resistance relateĪn electric circuit is formed when a conductive path is created toĪllow free electrons to continuously move. ![]()
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