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# Ammeters

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1. So ive been told that an ammeter needs a negligible resistance so that the current doesnt decrease, but i also thought that the current in a series circuit was always constant so which is right? or are both ? (Might be a silly question and im missing something easy)
2. (Original post by Angus09)
So ive been told that an ammeter needs a negligible resistance so that the current doesnt decrease, but i also thought that the current in a series circuit was always constant so which is right? or are both ? (Might be a silly question and im missing something easy)

Both correct.
3. (Original post by Angus09)
So ive been told that an ammeter needs a negligible resistance so that the current doesnt decrease, but i also thought that the current in a series circuit was always constant so which is right? or are both ? (Might be a silly question and im missing something easy)
If you add an Anmeter with resistance the current would decrease and then be at a lower constant value. Current is constant in a series circuit unless you add resistance

I=V/R

so if you add resistance current gets smaller as Voltage is constant (unless you change the settings of the cell/battery pack)
4. I think they're both right?
5. (Original post by Angus09)
So ive been told that an ammeter needs a negligible resistance so that the current doesnt decrease, but i also thought that the current in a series circuit was always constant so which is right? or are both ? (Might be a silly question and im missing something easy)
Here
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