You are Here: Home >< Physics

# Capacitor discharge voltage

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. For the paper below, in question 17biv, i don't understand why you can't use the average potential difference from 17bi instead of 2V. Please help

http://qualifications.pearson.com/co...-June-2014.pdf
- Paper

http://qualifications.pearson.com/co...-June-2014.pdf
- Mark Scheme

http://qualifications.pearson.com/co...-June-2014.pdf
- Examiner's report
2. The equation

is used for the charge or discharge of a capacitor and is therefore usually written

.

In the one charge/discharge cycle, the change in voltage is not equal to the average voltage. Thats why you cant use it.

As the question asks for the charge when there is one discharge of the capacitor, you have to look at the max voltage - min voltage, which will be 6.2-4.2 which is 2V.
3. (Original post by The-Spartan)
The equation

is used for the charge or discharge of a capacitor and is therefore usually written

.

In the one charge/discharge cycle, the change in voltage is not equal to the average voltage. Thats why you cant use it.

As the question asks for the charge when there is one discharge of the capacitor, you have to look at the max voltage - min voltage, which will be 6.2-4.2 which is 2V.
OK Thank you

## 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. Oops, you need to agree to our Ts&Cs to register

Updated: April 16, 2016
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

### University open days

Is it worth going? Find out here