Ammeter, voltmeter and circuit

My teacher said in a series circuit, we always use ammeter. But in a parallel circuit, we use voltmeter. Why? Or was she wrong actually? Please explain. Thank you!

not very good..umm..actually,ammeter have to connect in series(not in a series circuit, we always use ammeter),because ammeter have close-to-zero-internal resistance for series wiring for measuring current,
voltmeter have to connect in parallel(not in a parallel circuit, we use voltmeter),because voltmeter have very high internal resistance for parallel wiring for measuring voltage.
THIS ABOUT THE ADVANCED KNOWNLWDGE,if you want to know,i can tell you.


And I know ammeter is used to measure current. But does it mean it is measuring the resistance too? I mean, if the ammeter shows that the current is big, we would know that the resistance is small...

not yet.high current may not have low resistance,if you supply a high voltage,
the current will increase although it a high resistance,but if you accordingV=IR,yep,you can defined it,

An ammeter measuring the current across eg. a wire should be connected in series. A voltmeter measuring the potential difference between one point of the wire to another point eg. from positive terminal of battery to negative terminal of battery, should be connected in parallel to the circuit.

The resistance can be calculated if you have both an ammeter and voltmeter, or if you have a multimeter to measure the ohms.

You can use an ammeter or a voltmeter in any circuits. It depends on your purposes.

An ammeter is to measure current.
A voltmeter is to measure voltage.