Digital Multimeter Usage and Concepts

This video tutorial explains how to use a digital multimeter to measure resistance. It covers setting up the multimeter, connecting probes, and the importance of not measuring resistance in a live circuit. The tutorial also demonstrates calculating resistance and verifying it with color codes on resistors. A quiz at the end reinforces the key points learned.

What is the primary function of a digital multimeter in this video?

• To measure resistance in a circuit

• To measure power in a circuit

• To measure voltage in a circuit

• To measure current in a circuit

What setting should the multimeter be on to measure resistance?

• Voltage

• Current

• Ohms

• Amperes

What happens if the resistance is greater than the selected scale on the multimeter?

• The multimeter shows an error message

• The multimeter shows the maximum value

• The multimeter shows a blank or '1'

• The multimeter shows zero

Where should the red lead be connected to measure resistance?

• Common socket

• Voltage socket

• Current socket

• Omega socket

What does it mean when the multimeter shows infinite resistance?

• The circuit is shorted

• The circuit is complete

• The circuit is open

• The circuit has zero resistance

Why do the probes show a small resistance when touched together?

• Due to incorrect settings

• Due to a short circuit

• Due to a faulty multimeter

• Due to the resistance of the wires and contact leads

What must be done before measuring the resistance of a device in a circuit?

• Increase the voltage

• Disconnect the device from the circuit

• Change the multimeter battery

• Switch the multimeter to current mode

What is the approximate resistance of the bead resistor after accounting for the probe resistance?

• 23.3 ohms

• 20 ohms

• 21 ohms

• 25 ohms

What does the color code on the resistor indicate?

• The current rating

• The power rating

• The voltage rating

• The resistance value

What are the three keys to using an ohm meter effectively?

• Set the dial correctly, plug in wires correctly, disconnect device from circuit

• Set the dial to voltage, plug in wires correctly, measure in live circuit

• Set the dial to current, plug in wires incorrectly, disconnect device from circuit

• Set the dial to ohms, plug in wires incorrectly, measure in live circuit