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Recall from introductory electrical engineering that the quotient of voltage divided by current is termed electrical resistance and has units of ohms. Applying unit analysis to resistivity, it has units of ohms times square meters divided by meters, and so has units of ohm-meters. But this is misleading because the “meters”
As the name implies, a resistor is a device that resists current flowing through it. In doing so, some of the electrical energy supplied to the circuit is dissipated as heat. With the proper choice of material resistivity and fabrication geometry, resistors can be manufactured that accurately the device.
symbols (such as j, exp, Cu) are used to indicate mathematical operations, chemical elements etc. Frequently occurring technical phrases are commonly rendered as abbreviations (such as e.m.f., p.d.). In circuit diagrams, graphical symbols identify network components and devices.
resistors typically used in circuits are marked with color coded bands that give the resistance and the tolerance (i.e., the uncertainty in the resistance value) as shown schematically in Fig. 1.5. As shown in the figure, the bands are usually grouped toward one end of the resistor. The band closest to the end is read as the first digit of ...
Resistor: A basic circuit element that models resistance; it is characterized by its resistance R in Ohms [ ]. For an ideal resistor, R is constant regardless of the current through or voltage across
Resistor circuit symbol(s) Resistors in series and parallel. Different variations of resistors. Color coding decoding. Surface mount resistor decoding. Example resistor applications. Consider reading... Some of the concepts in this tutorial build on previous electronics knowledge.
6.3 Electrical Energy and Power Consider a circuit consisting of a battery and a resistor with resistance R (Figure 6.3.1). Let the potential difference between two points a and b be ∆VV=−baV>0. If a charge is moved from a through the battery, its electric potential energy is increased by .
