# What does a variable resistor control?

## What does a variable resistor control?

The variable resistor is a resistor that controls (increase or decrease) the flow of electric current when we vary or change its resistance. In other words, when we vary the resistance of the variable resistor, the electric current flowing through it will increase or decrease.

## How do you calculate variable resistor?

We find then that the resistance of our variable resistor equals the overall circuit resistance minus the resistance of the galvanometer minus the resistance of the fixed resistor.

Does a variable resistor change the voltage?

Variable resistors allow you to adjust the value of voltage by changing the resistance and keeping current constant .

### Why does a variable resistor need to be adjusted?

A variable resistor is an electronic component with adjustable resistance. It consists of a resistor and a rotating or sliding system. It is usually used in the circuit that needs to adjust the resistance frequently and plays the role of adjusting the voltage, adjusting the current, or controlling the signal.

### Why do you need to adjust the variable resistor?

What resistor do I need to drop 24v to 5v?

You will require: Resistor (R1)190 Ohms – 2W or greater and (R2)50 Ohms (0.6W or greater). If you do not have the exact values stated then you will not get exactly 5 volts. Make sure that your load (what you want to use the 5v for) is a lot higher then 50 Ohms.

## Does variable resistor affect voltage?

Variable resistors are widely used in electric circuits to adjust the value of current or voltage, since the resistance of variable resistors can be set to a certain value. Variable resistors allow you to adjust the value of voltage by changing the resistance and keeping current constant .

## What size resistor do I need to reduce voltage?

To reduce voltage in half, we simply form a voltage divider circuit between 2 resistors of equal value (for example, 2 10KΩ) resistors. To divide voltage in half, all you must do is place any 2 resistors of equal value in series and then place a jumper wire in between the resistors.

Why do variable resistors have 3 pins?

A 3 terminal pot used with 3 terminals, is basically just a voltage divider. As you move the wiper, you increase one resistor in the voltage divider, while decreasing the resistance in the other. So a 3 terminal pot is a variable voltage divider.

### What are the advantages of a variable resistor?

The advantage of variable resistors is that you have more control over the voltage. You can also adjust the amount of voltage flowing through a circuit.

What happens if I use a higher ohm resistor?

Since the current is set by the values of the voltage and resistance, the Ohm’s law formula can show that: If we increase the voltage, the current will increase. If we increase the resistance, the current will reduce.

## Can a variable resistor be used as a switch?

There is a switch method in which variable resistors with the annular cross-section are used for controlling the equipment. The track made in a straight path is called a slider.

## What is the power dissipation of a 2K resistor?

Resistor 2K 50W – rated resistance is 2 kOhm, power dissipation is 50W. Resistors with a specific rated power can also be manufactured to individual order. Other similar series of resistors are RX20, RXG, ASE, AST, AVE, AVT, D50K, L50J.

How to calculate the colour code of a 2K resistor?

2k Resistor colour Code calculations are: 1st band= Red= 2 (1st digit) 2nd band= Black= 0 (2nd digit) 3rd band= Red= 100 (multiplier)

### How to check the value of a resistor using a multimeter?

Use proper light to do it. Use a digital multimeter to check the value of a resistor. But DMM (digital multimeter) does not see correct values when a resistor is connected in a circuit, in such places color code comes handy.

### What is the insulation resistance of wire resistors?

The insulation resistance of wire resistors is at least 1000 MOhm. Working time – at least 15000 hours. Structurally, the resistor consists of a tubular ceramic core on which a constantan (low resistance resistor) or nichrome (high resistance resistor) wire is wound.