potentiometer......?

Question

how do i decide which potentiometer to use for elecronics?

how do i pick how many ohm's?

Answer 1

Look at your minimum and maximum required voltage in the circuit. Find a potentiometer that covers this range. You don't want one where your needed range is only 5% of what the potentiometer can do because you'll lose resolution/accuracy.

Try to get a good fit but allow for some conservativism on both ends of the range.

Make sure that the one you pick is rated to handle the amperage of the circuit without getting fried.

That's it.

- Kevin

Answer 2

A potentiometer has 3 terminals. A rheostat (that's an historic call for a variable resistor that would shelter a great little bit of present day) basically desires 2 terminals. the factor is that with a potentiometer, you may variety the utilized voltage from the provision voltage each and each of how right down to 0. you may no longer try this with a rheostat. you may variety the voltage utilized to the component from the provision voltage right down to three fee desperate via the ratio of the component's resistance to the optimal resistance of the rheostat. the present via a potentiometer does not stay the same. the present which you're putting contained in direction of the component has to return from someplace! suitable desires on your attempt.

Answer 3

It all depends on the application.

If you are trying to limit the current, you figure out how much current at maximum you want to limit, then use the ohm's low to figure out the value required for your application.

If you are trying to devide the voltage, you figure out how much current you want to waste (in the potentiometer) and how much current you want to draw, use the ohm's law to figure out the value.

In cases of volume control or level control, you'd choose a value high enough to not load the input. You'll have to know the output impedance of the source.

Also, don't forget, you have to know the curve of the change, too. There are A, B, and C curves in which A and B are most common. A type is used for volume control because the chagne of the rotation and corresponding change in value of the resistance most closely matches the human preception of sound level change. B type is linear.

Answer 4

It's used for checking Voltage or Ampere

Answer 5

You pick how many ohms you need, and then if you want a sliding or turning type knob.