Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

rishabh.mission Group Title

Is it correct to say that a potentiometer is equivalent to an ideal voltmeter?

  • one year ago
  • one year ago

  • This Question is Closed
  1. slotema Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    A potentionmeter is basically a device with a variable resistance (see e.g. http://en.wikipedia.org/wiki/Potentiometer ). What should the resistance of an ideal voltmeter be? (Hint: it has to do with the current through the voltmeter)

    • one year ago
  2. Diwakar Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    A voltmeter requires some current to flow through itself to be able to show some deflection. This would require it to have some resistance.This would change the resistance of the circuit and consequently the current . The potential drops across each of the components of the circuit changes and it is here that the error is produced. For perfect results voltmeter should have infinite resistance and connected parallel across a component. But a infinite resistance voltmeter won't even work. Potentiometer works on null deflection method i.e. when the galvanometer shows zero deflection and since total potential drop in the circuit is zero, we can easily find the potential across a component by knowing the voltage fed(batteries) to the component.

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...


  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.