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How does wattage affect a resistor?
Resistors come in a variety of different ratings based on wattage. As a rule, lower wattage resistors are smaller than higher wattage resistors. I understand the wattage determines roughly how much current it can handle before it burns up.
What determines resistance of a resistor?
The resistance of an object (i.e., a resistor ) depends on its shape and the material of which it is composed. Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.
What makes a resistor more resistant?
The number of copper turns controls the resistance very precisely: the more copper turns, and the thinner the copper, the higher the resistance. In smaller-value resistors, designed for lower-power circuits, the copper winding is replaced by a spiral pattern of carbon.
Does a resistor increase resistance?
Resistors in series In a series circuit, the total resistance across all of the components (the ‘net resistance’) increases as more components are added. The two resistors have the same current through them. The potential difference across them will be different if they have different resistances.
How is the wattage of a resistor determined?
Wattage means how much power the physical resistor is rated to handle. The rating is always for given conditions, such as the ambient temperature, or when mounted on a heat sink. You determine the power in a resistor by computing the voltage across times the current thru it.
Which is more important, the wattage or the resistance?
Wattage may be more importaint then resistance. Resistors can range in wattage from nearly zero to… tens of thousands of watts. Without looking hard I found resistors on Digikey for sale range from .0125 to 80 watts. Wattage means how much power the physical resistor is rated to handle.
Why do resistors have a maximum power rating?
If the size of the resistor is large the power rating would be more and it mostly depends on the surface area of the resistor. Resistors that exceed their maximum power rating tend to go up in smoke, usually quite quickly, and damage the circuit they are connected to.
When to use high or low wattage resistors?
Hence, it is necessary to select proper resistor wattage for the given application. Typically, from the temperature above 100°C high wattage resistors are preferred. The wattage rating relies on the dimension of the resistor also.