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SAFETY SOCKET, 25A, SOLDER, BLACK, Product Range:-, Current Rating:25A, Voltage Rating:1kV, Contact Plating:Nickel Plated Contacts, Connector Mounting:Panel Mount, Connector Colour:Black, Contact Material:Brass, Colour:Black RoHS Compliant: Yes
The resistance-change factor per degree Celsius of temperature change is called the temperature coefficient of resistance. This factor is represented by the Greek lower-case letter “alpha” (α). A positive coefficient for a material means that its resistance increases with an increase in temperature.
Tolerance is the percentage of error in the resistor's resistance, or how much more or less you can expect a resistor's actual measured resistance to be from its stated resistance. A gold tolerance band is 5% tolerance, silver is 10%, and no band at all would mean a 20% tolerance.