Current

Electric current is the flow of electrons. Metals are such good conductors because they have many delocalised electrons. Insulators don't have delocalised electrons, and so current cannot flow through them.

Equation

$$I = \frac{Q}{t}$$

Where:

• $I$ is the current, in Amps (A)
• $Q$ is the charge, in Coulombs (c)
• $t$ is the time, in seconds (s)

Use to calculate the charge

Calculate the charge if a current of 2A flows for 5 seconds.

$$\begin{align} I & = \frac{Q}{t} \\ I * t & = Q \\ 2 * 5 & = 10 \end{align}$$

Therefore, the charge is 10c.

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