x Turn on thread page Beta
 You are Here: Home >< Physics

# i am confused about absolute error and relative error watch

1. My physics teacher taught some knowledge about absolute error and relative error. however,He used very complicated way to explain ,he used differential coefficient .I still do not know how to get absolute error . can anyone help me by using a standard and acceptable British method(cause i am a international student) .thanks a lot.
2. (Original post by claudezq)
My physics teacher taught some knowledge about absolute error and relative error. however,He used very complicated way to explain ,he used differential coefficient .I still do not know how to get absolute error . can anyone help me by using a standard and acceptable British method(cause i am a international student) .thanks a lot.
The absolute error is just the actual value (±) of the uncertainty in your measurement.
If you measure a length of 100mm with a rule with a 1mm scale you could record the reading as 100 ± 1mm

The absolute error is ± 1mm

The relative error can be either the fractional error or the % error

The fractional error is just the absolute error divided by the value you measured. So here it's

1mm/100mm = 0.01

The % error is this fraction x 100
So its 1%

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:
Updated: March 19, 2013
Today on TSR

### I've studied the wrong subject

...Should I go back to school?

### Should I complain about my supervisor?

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE