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A voltmeter is an instrument used to measure the electrical potential difference, or voltage, between two points in an electric circuit. It is connected in parallel to the circuit component where the voltage is being measured. The measurement is displayed either with a needle on a scale (analog voltmeter) or as a numerical value (digital voltmeter).  

A digital ammeter is an electronic instrument that measures electric current in amperes (A) and displays the reading as a numerical value on a digital screen. It works by using an analog-to-digital converter (ADC) to measure the voltage drop across a shunt resistor in the circuit, which is then converted into a digital current reading. Unlike older analog meters with a needle and dial, digital ammeters provide a precise and easy-to-read measurement and often include advanced features like auto-ranging, data logging, and alarm functions. 

An ammeter is an instrument used to measure the electric current flowing through a circuit. It is always connected in series with the circuit and is designed to have very low internal resistance so it does not significantly affect the current being measured. The measurement is displayed in amperes (A). 

An analog ammeter is a device that measures electric current by using a pointer that moves across a calibrated dial. It works by converting the current into a magnetic field, which then creates a deflection in a moving coil or needle, and the position of the needle on the scale indicates the current's value. These instruments are connected in series with a circuit to measure the current flowing through it.