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RELATED STUDIES

WIRE

Any long metallic thread or filament that has uniform across section may be called a wire. Diameters can range from very small---many times thinner than a human hair---to rods about 1 inch (2.5 centimeters) in diameter. Wires usually have a circular cross section, through rectangle and even hexagonal sections are also in use.

Based on the study from Compton (2004), Wires are encountered in almost all aspects of daily life. When wire is used to conduct electricity it must be given an insulating coating or covering. This insulation prevents the short circuit that might occur if the bare wire came into contact with other electric conductors. Wires used in transformers or electric magnets typically have a thin lacquer coating baked onto the copper. Other electric wires may be covered with plastic, rubber, or woven silk or cotton fibers that have been impregnated with wax, resin or some other preservative.

MULTIMETERS

In the electrical/electronics lab, a common piece of test equipment is the multimeter, in which different kinds of meters are combined into a single unit. The volt-ohm-milliammeter (VOM) is the most often used.

As its name implies, it combines voltage, resistance, and current measuring capabilities. According to Gibilisco(2004), you should not have trouble envisioning how a single milliammeter can be used for measuring voltage, current, and resistance. Commercially available multimeters have certain limits in the values they can measure. The maximum voltage is around 1000 V. The measurement of larger voltages requires special probes and heavily insulated wires, as well as other safety precautions. The maximum current that a common VOM can measure is about 1 A. The maximum measurable resistance is on the order of several megohms or tens of megohms. The lower limit of resistance indication is around 0.1 to 1 O.

RESISTORS

Some substances, such as carbon, conduct electricity fairly well but not really well. The conductivity can be...