You are Here: Home

# V =IR question

Announcements Posted on
For applicants, undergrads and postgrads: Find out what's happening during Student Money Week here 05-02-2016
Are postgrad degrees a waste of time? Have your say and be in with a chance of winning a £30 Amazon voucher 29-01-2016

1. The resistance of R2 is 6/3 =2 right? (the answer for this was blank so couldn't check)
2. Yes - A is at 12v and B is at 6v so there must be 12-6 = 6v across R2
3. (Original post by teachercol)
Yes - A is at 12v and B is at 6v so there must be 12-6 = 6v across R2
I just looked at the diagram again and got slightly confused.. Why is the PD across A and B different? Isn't the voltage in a parallel circuit equal in each of the branches? So shouldn't the PD across A = PD across B ?
4. (Original post by sabre2th1)
I just looked at the diagram again and got slightly confused.. Why is the PD across A and B different? Isn't the voltage in a parallel circuit equal in each of the branches? So shouldn't the PD across A = PD across B ?
Yes, the PD across both branches in a parallel circuit is the same. However, in the second branch, the lamp is in series with R2. So the voltage splits between the two, giving you 6V across the lamp, and 12-6, that is 6V across R2.
5. (Original post by sn8595)
Yes, the PD across both branches in a parallel circuit is the same. However, in the second branch, the lamp is in series with R2. So the voltage splits between the two, giving you 6V across the lamp, and 12-6, that is 6V across R2.
Thanks
6. (Original post by sabre2th1)
Thanks
Pleasure.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. By joining you agree to our Ts and Cs, privacy policy and site rules

Updated: April 18, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Dropping out of Oxford

Find out what it's like in Ethereal World's blog

### Get ready for Student Money Week

Poll
Study resources
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.