Changes

: The [[SI Unit|units]] of '''current''' are [[Amp|amperes]], which are also called [[amp]]s ([[A]]).: A '''current''' in a [[wire]] is a flow of [[electron]]s which are [[Negative Charge|negative]]ly [[Electrical Charge|charge]]d [[particle]]s.: Conventional '''Current''' flows from [[positive]] to [[negative]]. This is because [[electricity]] was discovered before [[scientist]]s knew about [[electron]]s.: In a [[salt]] [[solution]] '''current''' is the flow of both [[Positive Charge|positive]] and [[Negative Charge|negative]] [[ion]]s.

'''Electrical current''' is the [[rate]] of flow of [[Electrical Charge|charge]].

: The [[SI Unit]]s of '''current''' are [[Amp|amperes]], which are also called [[amp]]s ([[A]]).: A '''current''' in a [[wire]] is a flow of [[electron]]s which are [[negative]]ly negatively [[Electrical Charge|charge]]d [[particle]]s.: Conventional '''Current''' flows from [[positive]] to [[negative]]. This is because [[electricity]] was discovered before [[scientist]]s knew about [[electron]]s.: In a [[salt]] [[solution]] '''current''' is the flow of both [[Positive Charge|positive]] and [[Negative Charge|negative]] [[ion]]s.

''NB: You should remember this equation, but with charge as the subject of the formula.''

Where:

Where:

| style="height:20px; width: 300px; text-align:center;" |A cloud in a thunderstorm loses 15kC 15C in one lightening strike. At a current of 31,000kA. Calculate how long this lightning strike lasts correct to two [[Significant Figures|significant figures]].

Q = 15kC = 15x10³15C

<math>3.1 \times 10^7 = \frac{15 \times 10^3}{t}</math>

<math>t=\frac{15 \times 10^3}{3.1 \times 10^7}</math>

<math>t = 4.8387 \times 10^{-47}s</math>

<math>t\approx4.8 \times 10^{-47}s</math>