The simplest resistor combinations in any electrical circuit are parallel and series connections. The equivalent resistance depends both on how the resistors are connected in the circuit and their individual resistance values. Whenever several resistors are connected together to a voltage source like a battery, the current supplied by the voltage source will depend on the equivalent resistance of the electrical circuit. Ohm’s law is expressed as: I = V/R, where I is the circuit current, V is circuit voltage and R is the overall resistance. The relationship between voltage, resistance, and current in an electrical circuit with resistors is given by Ohm’s Law. Most electrical circuits consist of more than one resistor. Insulators, on the other hand, are materials that present very high resistance to electrons flow examples are rubber, plastic, wood, and glass.īasically, a resistor is an ohmic device that limits the flow of current in a circuit. Conductors are materials that have very little resistance to electrons flow, they include aluminum, silver, gold, copper, and many more. Naturally, all materials oppose current flow to some extent, and they are classified as either conductors or insulators. It is measured in ohms and symbolized by (Ω)-a Greek letter omega. Resistance is defined as the measure of opposition to charge flow (current flow) in an electrical circuit.
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