![]() For example, a 5% 100 Ohm resistor will have resistance in the range of 95-105 Ohms. Tolerance rating means that the resistance will remain within that tolerance of the nominal value across the rated temperature range for the rated life of the resistor. Nowadays, 1% resistors are pretty much the same cost as 5%, so may make sense to just use 1% tolerance parts for general purpose.1% parts are more expensive and may be more difficult to find, so just use those when you need the increased accuracy. When implementing a resistor it is typically the power rating that determines which type and size of resistor you select.Īnother important specification of real world resistors is their tolerance (accuracy of resistance value), and common tolerances are. The power rating is based on how much heat the device can safely dissipate, so it is really the average power dissipated by the resistor over some timeframe relating to its thermal mass that is the concern, not the instantaneous power dissipation. Real world resistors come in a wide range of values and their limiting specification for most applications is their power rating. These are used all the time in EE school and on the job. Power = Voltage Squared Divided by Resistance Voltage = Current * Resistance (Ohm’s Law) Resistor Symbol Common Resistor Equations The circuit symbol for a resistor is below. Resistors do not introduce any time lag between voltage and current, changes in one cause changes in the other instantaneously. Remember from Ohm’s Law that resistance is Voltage over Current and that resistance has units of Ohms. Resistors are conductive devices that exhibit resistance. Results should be interpreted to the nearest standard value when a quantization error appears.Electrical Engineering educational website Instead of using advanced Javascript functions that would make the script incompatible with older browsers, I elected Quantization errors in resistor values are inherent to Javascript.More than 10 sets of resistors may produce the same lowest error, but only the first 10 will be presented.Īll will produce identical lowest error when used. Up to 10 sets of resistors may be presented, or as few as one. Different sets of resistor values may lead to the same identical lowest error.Javascript compatibility: IE6+, Netscape 6+, Mozilla 1.3+, Opera 7+.Voltage Divider / Non-Inverting Attenuator NOTES How do I select the best set of resistors for a voltage divider? ![]()
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