Difficult Problems:
Can ordinary resistors replace precision resistors?
In a specific temperature range, the error margin of a precision resistor is significantly smaller compared to that of an ordinary resistor. This means that the material used in precision resistors has better thermal stability. But can an ordinary resistor be used as a replacement for a precision one? Let me share some thoughts on this.
Resistors are commonly used in circuits for current limiting and voltage division. When it comes to current limiting, the precision of the resistor isn't usually critical. However, when it comes to voltage division, there are two main scenarios:
1. If the accuracy of the divided voltage doesn't greatly affect the next stage of the circuit, then standard resistors are sufficient for the job.
2. If the voltage accuracy is crucial for the following circuit, high-precision resistors must be used. Of course, sometimes designers might over-specify the resistor's accuracy due to cost considerations or other factors, but this is not the norm and should not be the general rule.
Ordinary resistors are typically chosen based on rough estimates of resistance value, while precision resistors require accurate measurements using calibrated meters, often through repeated testing to ensure reliability. Replacing a precision resistor with an ordinary one could lead to unexpected results during testing, which may cause unnecessary trouble down the line.
It's important to note that while precision resistors can always be used in place of ordinary ones, the reverse is not true. Choosing the right type of resistor depends on the specific requirements of the circuit and the level of accuracy needed.
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