Physics (edexcel) help!

Watch this thread
SmallTown
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 5 years ago
#1
This was on the specification:
Explain how the current in a circuit depends on the potential difference of the source
I don't get the question, or what you have to explain?
1
reply
ThePCPolice
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 5 years ago
#2
(Original post by SmallTown)
This was on the specification:
Explain how the current in a circuit depends on the potential difference of the source
I don't get the question, or what you have to explain?
This is regarding the Voltage in power lines, I'd assume. Increasing the voltage in powerlines decreases the current. This leads to less energy wasted as heat.
0
reply
ThePCPolice
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report 5 years ago
#3
V=I*R or (isolated for I) V/R = I. So the more voltage (potential difference) you have in a circuit, the more current you will have, assuming resistance is constant.
I think thats the answer.
0
reply
SmallTown
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report Thread starter 5 years ago
#4
(Original post by ThePCPolice)
V=I*R or (isolated for I) V/R = I. So the more voltage (potential difference) you have in a circuit, the more current you will have, assuming resistance is constant.
I think thats the answer.
Thanks!
0
reply
username2174765
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report 5 years ago
#5
potential difference is energy per unit charge passed I believe so when you have a circuit the voltage increases to rise the charge through the components and the higher the voltage increase the faster the current and the more energy is dissipated at certain components (a resistor), so meaning the more energy transferred the higher the potential difference, the other person I think means the current instead of the charge, if you have the CGP revision guide for edexcel its on the third page of P2 i believe.

Hope this helped!
1
reply
SmallTown
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report Thread starter 5 years ago
#6
I have the revision guide, just didn't understand it! Thanks for explaining it, good luck on your exam (if your doing it)
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How did your AQA A-level Physics Paper 1 exam go?

Great! Feeling positive (124)
29.11%
It went fairly well (206)
48.36%
It didn't go too well (62)
14.55%
TERRIBLE! (34)
7.98%

Watched Threads

View All