How do you convert a 3-phase supply in the transmission line to a single phase???
Answer:
The easiest way is simply to tap your power from a single phase of the three-phase line. That is what the power company usually does, with neighboring single phase loads tapped across the different phases in the line to limit the amount of imbalance between the phases.
Ohm's Law doesn't specifically refer to constant temperature. However, the resistances of most materials is temperature-dependent. The temperature of a resistor will also change if the RMS current and voltage, hence the power dissipated in the resistor, changes.
Commercial resistors with resistance ratings are typically made of materials whose resistance changes only minimally with temperature over their operating range unless the temperature dependence is part of the resistor's operation or the temperature dependence is large. Thermistors and platinum resistance thermometers are examples of resistors made of materials deliberately chosen to have a temperature dependence. Heating elements in electrical appliances and the filaments in incandescent light bulbs are examples of resistors whose temperature changes greatly in operation and whose resistance may also change accordingly.
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