Calculating Potential Difference in a Series Circuit

[wkn0524]

1. If the current in the 4.0 ohm resistor is 1.4A. What is the magnitude of the potential difference. Va-Vb?



2. V=IR, 1/Req=1/r1 +1/r2 ...



3. Va-Vb= 48V

I was stuck on beginning of the question. I knew how to start if the voltage is given but now asking me to find the potential difference and make me headache. I'm a beginner on the electrical course.

Thank.

 

[mfb]

Potential difference and voltage are two names for the same thing.

 

[CWatters]

Never mind. Deleted.