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A higher quantity of ceramic content will result in more resistance. Wirewound Resistor Wirewound resistor types are prefixed with a WH or W notation (eg WH10) and are available in the WH aluminium clad package (1%, 2%, 5% & 10% tolerance) or the W vitreous enamelled package (1%, 2% & 5% tolerance) with power ratings from 1W to 300W or more. Tutorial on Different Types of Resistors Table of Contents: Tutorial on Different Types of Resistors Metal Film & Wire Wound Resistors Thin film & Thick film Resistors Surface mount & Network Resistors Variable Resistors Semi Variable Resistors Special Resistors Resistance Measurement Measurementn by using Multimeter General precautions Circuit Analysis What is a Resistor?An electric resistor is a two-terminal passive component specifically used to oppose and limit current. Inductive reactance increases with frequency but is zero at DC (zero frequency). However, special non-inductive wirewound resistors are also available. Resistance is measured in units called Ohm. Film Resistor Metal Film Resistors have much better temperature stability than their carbon equivalents, lower noise and are generally better for high frequency or radio frequency applications. The tolerance of a resistor is the difference between the preferred value (i.e, 100 ohms) and its actual manufactured value i.e, 103.6 ohms, and is expressed as a percentage, for example 5%, 10% etc, and in our example the actual tolerance is 3.6%. Ohms Law: V = IRwhere V is the voltage applied across resistor, I is the current flowing through it, and R is the constant called resistance.The unit of resistance is ohms.

Fixed Resistors Variable Resistors . Fixed resistors are used in these situations to limit the flow of current. A resistor will always have the same resistance value no matter what the frequency of the supply from DC to very high frequencies and all resistors have one thing in common, their resistive value in Ohms in a circuit will ALWAYS be positive in nature and never negative. Because the wire of standard wire wound resistors is wound into a coil inside the resistors body, it acts like an inductor causing them to have inductance as well as resistance. Posted on June 10th 2016 3:01 pm Reply P Philip Hey basic electronic tutor site is awesome Posted on June 10th 2016 7:20 am Reply Z Zelong Nice. High current and voltage can also damage the resistor. They are much more accurate in value than carbon film resistors.

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