When measuring voltage, how should the probes be set on a powered circuit?

When measuring voltage in a powered circuit, the probes must be connected in parallel to the component or section of the circuit where the voltage is being measured. This configuration is essential because voltage is defined as the difference in electric potential between two points in a circuit. By placing the positive probe on one side of the circuit and the negative probe on the other, the voltage reading reflects the potential difference across that specific section.

Measuring voltage in parallel ensures that the circuit remains operational while providing an accurate reading. If the probes were placed in series with the power source, it would create a break in the circuit, possibly damaging the measuring instrument or affecting the overall operation of the circuit. Measuring at a right angle to the current does not apply, as the orientation of the probes does not influence voltage measurement. Lastly, touching only the ground wire would not provide any meaningful voltage reading, as there would be no potential difference to measure. Thus, connecting in parallel to the power source is the correct and necessary method for accurate voltage measurement.