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(E-BOOK Teknik Mesin) Teach Yourself Electricity and Electronics
Electrical resistance is measured in units called ohms. The higher the value in
ohms, the greater the resistance, and the more difficult it becomes for current to flow.
For wires, the resistance is sometimes specified in terms of ohms per foot or ohms per
kilometer. In an electrical system, it is usually desirable to have as low a resistance, or
ohmic value, as possible. This is because resistance converts electrical energy into heat.
Thick wires and high voltages reduce this resistance loss in long-distance electrical
lines. This is why such gigantic towers, with dangerous voltages, are necessary in large
utility systems.
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