GCE (A level) Physics E07 Resistance. Part 1 of 2

For part 2: http://www.youtube.com/watch?v=7hnu6dGhbxY
Part 1 of 2. Introduction to the concept of resistance. Contains worked example calculations.

Category:

Education

Tags:

• GCE
• physics
• A-level
• AS
• A2
• electricity
• resistance
• ohm

[Steve4Physics]

Hi MrRyanification. It is better to use accurate (un-rounded) earlier result. If you don't, you can introduce rounding errors; for calculations with many steps, this can make a significant difference. Usually you only need one or two extra significant figures for your accurate ‘working’ values, but always round each 'final' answer to a suitable number of significant figures.

In exams, markers allow a (small) range for each answer, so you are not penalised for small rounding errors.

[Steve4Physics]

Hi MrRyanification. It is better to use accurate (un-rounded) earlier result. If you don't, you can introduce rounding errors; for calculations with many steps, this can make a significant difference. Usually you only need one or two extra significant figures for your accurate ‘working’ values, but always round each 'final' answer to a suitable number of significant figures.

In exams, markers allow a (small) range for each answer, so you are not penalised for small rounding errors.

[MrRyanification]

When doing a question which requires earlier calculations which you did. Should you use you rounded answer? I usually don't but sometimes it gives a slightly different answer to the mark scheme...

[Steve4Physics]

Hi MrRyanification. It is better to use accurate (un-rounded) earlier result. If you don't, you can introduce rounding errors; for calculations with many steps, this can make a significant difference. Usually you only need one or two extra significant figures for your accurate ‘working’ values, but always round each 'final' answer to a suitable number of significant figures.

In exams, markers allow a (small) range for each answer, so you are not penalised for small rounding errors.

[Steve4Physics]

Thanks for that StopPokingUs (great name). I'll gradually be adding more videos I hope, but it will be a fairly slow process unfortunately. Good luck with the AS exams - practice as many old papers as you can and go through the mark schemes (old ones generally on the Exam Boards' websites). Good luck.

[TruthExposer100]

Thanks mate please could you cover other topics in as physics that will help me so much an relieve a gigantic stress