Answered

How does a Digital Multimeter (DMM) measure voltage in a circuit?


ABy directly calculating the power across the circuit.
BBy comparing the voltage of one point to another point in the circuit.
CBy adding the voltages of two points in the circuit.
DBy measuring the current between two points in the circuit.

Verified Answer :

Final answer:

A Digital Multimeter measures voltage by comparing one point in a circuit to another, indicating the voltage difference on its display. When probes are connected, it shows the electric potential difference without altering the circuit. This principle is essential for accurate voltage measurements in electrical systems.


Explanation:

How a Digital Multimeter Measures Voltage

A Digital Multimeter (DMM) measures voltage in a circuit primarily by comparing the voltage of one point to another point in the circuit. This process involves connecting the DMM leads to two different points (often referred to as probes) in the circuit.

When you set the DMM to measure voltage, the device applies a very small amount of current through its internal components and measures how much voltage is present between the two points. This is based on the principle of voltage difference, which states that voltage is the difference in electric potential between two points. The DMM displays this difference as a numerical value on its screen.

Example of Voltage Measurement

For instance, if you wanted to measure the voltage across a battery, you would place one lead on the positive terminal and the other on the negative terminal. The DMM will then indicate the voltage that exists between those two points, thus providing you with the voltage measurement without interrupting the circuit.


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