RESISTORS:
How to Choose the Appropriate Resistor
Resistors are devices connected to a circuit to introduce a specified
resistance.
The resistance is measured in ohms.
As stated in Ohm s
Law, the current through the resistor will be directly proportional...
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RESISTORS:
How to Choose the Appropriate Resistor
Resistors are devices connected to a circuit to introduce a specified
resistance.
The resistance is measured in ohms.
As stated in Ohm s
Law, the current through the resistor will be directly proportional to
the voltage across it and inversely proportional to the resistance.
How a Resistor Works.
The passage of current through the resistance produces heat.
The
heat produces a rise in temperature of the resistor above the
ambient temperature.
The physical ability of the resistor to withstand, without deterioration, the
temperature attained, limits the operating temperature that can be permitted.
Resistors are rated to
dissipate a given wattage without exceeding a specified standard "hot spot" temperature and the
physical size is made large enough to accomplish this.
Deviations from the standard conditions ("Free Air Watt Rating") affect the temperature rise and
therefore affect the wattage at which the resistor may be used in a s
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