A voltmeter is a scientific instrument used to measure the electric potential difference between two points in an electrical circuit.
A voltmeter works by using a calibrated scale and a sensitive galvanometer to measure the voltage or potential difference between two points in an electrical circuit. It is connected in parallel to the circuit, allowing it to measure the voltage without disrupting the flow of current.
The voltmeter measures in volts (V). However, it can also measure in millivolts (mV) or kilovolts (kV) depending on the range and sensitivity of the instrument.
A voltmeter has a scale with numbers and markings that indicate the voltage being measured. The user must first select the appropriate range, then connect the voltmeter in parallel to the circuit. The voltage can be read from the scale where the pointer or digital display points to.
In a circuit with multiple batteries, the voltmeter will read the total voltage across all the batteries. This is because the batteries are connected in series, meaning the voltage adds up in each battery. For example, if there are two 1.5V batteries in series, the voltmeter will read 3V.
