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I'm in year 11, doing Physics for GCSE and my actual ending GCSE is on Friday which Is where I finish school.

I'm 16 and in the UK, I need help with the following equations:

P = I^2 x R (why is this equation used)

- all the power equations

- How to calculate uncertainty

I'm 16 and in the UK, I need help with the following equations:

P = I^2 x R (why is this equation used)

- all the power equations

- How to calculate uncertainty

**<< Mentor Note -- OP has edited this post to correct the equation. See Russ' quote below for the original equation that Russ is replying about >>**
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