Question

Explain how current , voltage and resistance is measured using digital multimeter.construct a circuit in simulator and determine the values of current ,voltage,and resistance using DMM.

Answer 1

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Measurement of resistance

$\bull$ If a resistor does open, the digital multimeter display will flash on and off or display OL (open line) because the resistor has an infinite resistance.

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$\bull$ Turn off power to the circuit.

$\bull$ Select resistance Ω

$\bull$ Plug the black test lead into the COM jack

and the red test lead into the Ω jack.

$\bull$ ∙ Connect the probe tips across the component or portion of the circuit for which you want to determine the resistance View the reading and be sure to note the unit of measure, Ω, ΩK, etc.

Measuring Voltage

$\bigstar$ Select volts AC (V~), volts DC (V—), mvolts (V—) as desired

$\bull$ Plug the black test lead into the COM jack and the red test lead into the V jack

$\bull$ Touch the probe tips to the circuit across a load or power source as shown (parallel to the circuit to be tested)

$\bull$ View the reading being sure to note the unit of measure

Measuring Current

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$\bull$ Turn off the power to the circuit

$\bull$ Disconnect, cut or unsolder the circuit, creating a place where the meter probes can be inserted

$\bull$ Select amps AC (A~), or amps DC (A—) as desired

$\bull$ Plug the black test lead into the COM jack and the red test lead into 10 amp (10A) or 300 milliamp (300mA) jack depending on the expected value of the reading

$\bull$ Connect the probe tips to the circuit across the bread as shown so that all current will flow through the meter ( a series connection)

$\bull$ Turn the circuit power back on

$\bull$ View the reading being sure to note the unit of measure

$\bigstar$ Different Circuit

$\bull$ using dmm

$\bull$ for current , voltage and resistance

$\bull$ different circuit diagram