![]() Likewise, the bottoms of the resistors are all connected to the same wire, so the voltage at the bottom of each resistor is the same. Note that the tops of the resistors are all connected to the same wire, so the voltage at the top of the each resistor is the same. Resistors are in parallel when both ends of each resistor are connected directly together. If we instead combine resistors by connecting them next to each other, as shown in Figure 19.16, then the resistors are said to be connected in parallel. In the next article, we will learn about r eading value, tolerance and power rating of resistors.In the previous section, we learned that resistors in series are resistors that are connected one after the other. If it is a power application, the resistor of at least three or four times the calculated power dissipation must be selected.Ģ) After deriving the required power range (in Watts), look for if the circuit requires SMT or through-hole mounting.ģ) Next, check out the required tolerance.Ĥ) Then, verify the maximum temperature rating.ĥ) Next, look for special conditions, like high-frequency application, power application, pulse power application or suitability to high frequency or high power applications.Ħ) Finally, check if the desired resistance is available for the selected resistor type. A resistor of at least twice the calculated power dissipation must be selected. ![]() How to use the Resistor Selection Reference Table –Ĭlick here for a pdf of the Required Power Rating tableġ) First of all, calculate the power requirement of the desired resistor. ![]() The properties of different types of resistors are summarized in the following table – So, let’s have a glimpse of professional way of selecting a resistor for a given application. The professional circuits need careful selection of resistors and may even involve scrutinizing of datasheets from the manufacturer of the resistor. The commercial circuits or professionally designed circuits involves a wide picture, even in case, as trivial as, selecting a resistor for the circuit. This remains thumb rule, until, you are testing circuits for hobby. For power applications (More than 5 Watt), wirewound resistors usually fit the bill.
0 Comments
Leave a Reply. |