Question

How to check DC voltage?

Answer 1

To check DC voltage, you can use a multimeter, which is a common tool for measuring electrical quantities like voltage, current, and resistance. Here's how to check DC voltage step by step:

What You Need:

1. A multimeter (set to measure DC voltage)
   

1. The circuit or device where you want to measure the DC voltage
   

Steps to Measure DC Voltage:

1. Set the Multimeter to DC Voltage:
   

   - Turn the multimeter's dial to the DC voltage (denoted by a “V” with a straight line and dotted line beneath it). This setting is usually marked as "V⎯" (DC voltage) or "DCV."

1. Connect the Multimeter Probes:
   

   - The multimeter has two probes: Red (positive) and Black (negative).
   - Plug the black probe into the COM port (common port) of the multimeter.
   - Plug the red probe into the port marked VΩma or VΩ (voltage and resistance).

1. Place the Probes Across the Circuit:
   

   - Place the black (negative) probe on the negative side of the circuit (for example, the ground or the negative terminal of a battery).
   - Place the red (positive) probe on the positive side of the circuit (for example, the positive terminal of a battery or the positive output of a power supply).

1. Read the Display:
   

   - Once the probes are placed correctly, the multimeter will show the DC voltage reading on its display screen.
   - Make sure the value shown is positive or negative depending on the orientation of the probes. If the reading is negative, simply switch the probes to get a positive reading.

1. Turn Off the Multimeter:
   

   - Once you're done measuring, turn off the multimeter to preserve battery life.

Example:

1. For a 9V battery, when the probes are connected, the multimeter should show a value close to 9V (or -9V if probes are reversed).
   

By following these steps, you can easily measure DC voltage in a circuit or across components!