# Quick Answer: How Can You Tell If A Resistor Is Blown?

## What are the signs of a bad blower motor relay?

Symptoms of a Bad or Failing Blower Motor RelayBlower motor does not function.

One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all.

Blown fuses.

One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse.

Melted relay..

## What is equivalent resistance in a circuit?

In a series circuit, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm’s law and is equal to the voltage divided by the equivalent resistance. The potential drop across each resistor can be found using Ohm’s law.

## What is a resistor used for?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

## What is the total resistance between A and B?

Between A and B there are two 4 ohms resistances in parallel. Hence, effective resistance between A and B = 2 ohms. Total resistance along ABC = 6 ohms.

## What could make a resistor go bad?

Make sure your machine is OFF to measure resistance. 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.

## Can you fix a blower motor resistor?

The resistor module is easy and inexpensive to replace. It’s then typically installed in the ductwork, near the car blower—either under the dash or under the hood. (Refer to a service manual to locate yours.) Purchase a new resistor module at the auto parts store (usually less than \$25).

## What are the symptoms of a bad blower motor?

Symptoms of a Bad or Failing Heater Blower MotorWeak airflow from the vents. One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. … Fan only blows at certain speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. … No air from the vents.

## What is equivalent resistance between points A and B?

The equivalent resistance between A and B will be(inΩ)

## What does a resistor look like?

A resistor is a little package of resistance: wire it into a circuit and you reduce the current by a precise amount. From the outside, all resistors look more or less the same. As you can see in the top photo on this page, a resistor is a short, worm-like component with colored stripes on the side.

## What is tolerance of a resistor?

The tolerance of a resistor is the maximum difference between its actual value and the required value and is generally expressed as a plus or minus percentage value. For example, a 1kΩ ±20% tolerance resistor may have a maximum and minimum resistive value of: Maximum Resistance Value.

## What happens if a diode fails?

However, a failed diode can short out too. In this case, the diode will exhibit a small resistance in both directions. The common reasons for a diode failure are excessive forward current and a large reverse voltage.