 # Question: How Do You Know If A Resistor Is Burnt?

## How do you tell if a resistor is burnt out?

A burnt out resistor can only be read one of two ways.

The first is the color code on the resistor, if it is through hole, or the number code if it is a smd resistor with a a number code.

If that is not available, the only other way is a circuit diagram, or a reference design around the IC it is supporting..

## How do you know if a resistor is working?

Pick out a random resistor and set the multimeter to the 20kΩ setting. Then hold the probes against the resistor legs with the same amount of pressure you when pressing a key on a keyboard. The meter will read one of three things, 0.00, 1, or the actual resistor value.

Resistors don’t really go bad unless you physically damage them or burn them by applying too much power. In that case, they have a very unique smell. The odor is hard to describe, but you’ll know something’s not correct. My thought is that your problem is elsewhere.

## What happens if a resistor opens?

Any interruption in the circuit, such as an open switch, a break in the wiring, or a component such as a resistor that has changed its resistance to an extremely high value will cause current to cease.

## What happens if a resistor fails?

A resistor seldom fails short. If it is getting hot enough to fail, a short would typically dissipate even more power and cause the material to ignite or explode.

## What happens if a resistor is shorted?

A shorted resistor (resistance of 0 Ω) would theoretically draw infinite current from any finite source of voltage (I=E/0). In this case, the zero resistance of R2 decreases the circuit total resistance to zero Ω as well, increasing total current to a value of infinity.

## How hot should a resistor get?

Typical maximum temperatures for carbon composition resistors would be around 100 to 120°C and for metal and oxide film types, about 150°C. Wirewound resistors can operate at higher temperatures up to around 300°C.

## Why does a resistor burn out?

When electricity is conducted through a resistor, heat is generated and dissipated through the surrounding air. Under excessive voltage, a resistor generates so much heat that it cannot dissipate the heat quickly enough to prevent burning.

## What happens if you remove a resistor?

If you remove one resistor from the series and don’t connect the wires. It will be open circuit and no current will flow in the circuit. If you remove the resistor and connect the ends from where you have removed the resistor. Circuit current will increase depending upon the value of resistor removed.