Think about the laws of attraction - what happens when a charged particle comes close to another charged particle?


This statement is in fact **false**. Similarly charged particles are repelled by each other, whereas oppositely charged particles are attracted to each other.


Maybe you remember from a previous lesson.


This is **true**. The flow of negatively charged electrons induces a current.


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See all the arrows that point through the cylinder? They are all labelled with a **q**.


We are trying to work out the **rate**. What does **rate** mean?


In order to work out the **rate** of flow, we also need the time period that we are measuring the rate of flow of charge in.


The current is the amount of charge in a certain time.


Nope, this is the amount of charge we measured over the course of 30 seconds. If we want to work out how much charge passed by per second we need to divide the charge by the time we measured it for.


We calculated that if we measured 1350 coloumbs in 30 seconds, then the current was $\frac{1350 coloumbs}{30seconds}=45amps$



Current is defined as the charge *per* second. So the total amount of charge must be divided by the total time.


Can you eliminate any of these options? Are there any that you know cannot be correct?


Remember $I=\frac{Q}{t}$. You can change this formula to make $Q$ the subject. That gives you $Q=I\times t$.


Remember $I=\frac{Q}{t}$ and be careful with units!


Remember $I=\frac{Q}{t}$. You can change this formula to make $Q$ the subject. That gives you $Q=I\times t$. Also remember that $t$ has to be given in **seconds**. 2 minutes is the same as 120 seconds, so we can work out the charge like this: $Q = 2amps \times 120 seconds = 240 coloumbs$ 
 


The electric current  (I) is the amount of charge (Q) passing past a point in a certain amount of time (t). I = Q ÷ t 

Flow of Charge

What Is Current?

Measuring Current

Conventional Current/Flow

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