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Appendix 2

AC equation derivations (chapter 6)

Deriving charge over time

Chapter 1 showed that current is the flow of charge at a specific point for a specific length of time – this can now be defined mathematically as the rate of change of charge over time:

C u r r e n t, I = \frac{d Q}{d t}

(6.1)

	$I$ is the current in amperes (A)
	$d Q$ is the rate of change of charge in coulombs (C)
	$d t$ is the rate of change of time in seconds (s)

This equation may ...

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