Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Troubleshooting
Research
Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

basic working of voltmeter

Avatar of andieje
andieje asked on
Math / Science
11 Comments1 Solution1153 ViewsLast Modified:
Hii

I asked a couple of questions a while ago about voltmeters but I have read over them again and I don't understand the answers so I will ask again and try and be clearer this time on what I am asking.

I am interested in the use of a voltmeter in a galvanic cell

Is it correct to say a voltmeter measures a potential difference across a cell? Which way round does the comparison go? Is the potential at the red lead compared to the black lead or vice versa. In other words, is it the potential at the red lead minus potential at black lead to vice versa

If the more negative potential is attached to the black lead and the less negative potential is attached to the red lead, will the potential difference be positive or negative?

What would be the potential be if you had the leads the opposite way.

I'm guessing it is the potential of the red lead minus the potential of the black lead. I have a diagram where it looks like the more negative potential attached to the black lead and the less negative potential attached to the red lead and the potential is positive. This would suggest it is red lead potential - black lead

Many thanks
ASKER CERTIFIED SOLUTION
Avatar of Enabbar Ocap
Enabbar OcapFlag of Italy imageEmbalsamador

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Commented:
This problem has been solved!
Unlock 1 Answer and 11 Comments.
See Answers