The main differences between an ammeter and a voltmeter are as follows:
Function: An ammeter is used to measure electric current, while a voltmeter is used to measure voltage.
Connection: An ammeter is connected in series with the circuit element through which the current is to be measured. A voltmeter is connected in parallel across the points where the voltage is to be determined.
Resistance: An ammeter typically has a very low internal resistance to minimize its impact on the current being measured. A voltmeter usually has a very high internal resistance to avoid drawing significant current and affecting the voltage across the measured points.
Range: The measurement ranges of ammeters and voltmeters are different, depending on the specific application and circuit requirements.
Display Units: Ammeters display current values in units such as amperes (A), milliamperes (mA), etc. Voltmeter displays voltage values in volts (V), millivolts (mV), etc.