Imagine that you're performing measurements on a circuit with a multimeter. you measure a total circuit current of 2a, and the circuit is powered by a 24 v power supply. what total resistance value would you expect to measure in the circuit?

a. 48 ohms
b. 2 ohms
c. 12 ohms
d. 24 ohms

a circuit contains a 10 ohm resistor, a 50 ohm resistor, and an 80 ohm resistor connected in parallel. if you test this circuit with a dmm, you should read a total resistance value of

a. 75 ohms.
b. 7.55 ohms.
c. 140 ohms.
d. 0.13 ohms.

vero puts the probe of her dmm across two terminals to check the voltage. she notices the needle actually goes below zero. what's happening?

a. since there can't be a negative quantity of voltage, there must be zero volts present.
b. she's reading resistance by mistake.
c. her meter needs the battery to be replaced.
d. she has reversed the polarity.

what type of circuit measurement is made by placing a meter's leads in parallel with a de-energized circuit?

a. current
b. power
c. voltage
d. resistance

the allowable amount of resistance between a resistor's true resistance and its labeled resistance is called the

a. potential.
b. continuity.
c. tolerance.
d. specification.

george is replacing a burned-out resistor in a circuit board. the board has a 10, a 20 and a 40 ohm resistor, all in series. when george has soldered in the new component and the circuit is fixed, he checks his mulitimeter. what reading does he get?

a. 5.71 ohms
b. 110 ohms
c. 47 ohms
d. 70 ohms

if you touch the two probes together while the dmm is set to resistance, what will happen?

a. the meter will short circuit and trip a protective circuit.
b. the meter will read infinite ohms (as high as its scale goes).
c. the meter will show the equivalent voltage of the meter's internal battery.
d. the meter will read 0 ohms

a circuit contains a 12 v power supply (a dc battery) and two 100 ohm resistors connected in series. what total current value would you expect to measure in this circuit?

a. 16.67 a
b. 0.12 a
c. 0.06 a
d. 8.33 a

a circuit with 1000 ohms resistance has current of 2 amps. what's the level of power?

a. 4000 watts
b. 2000 watts
c. 800 watts
d. 1000 watt

uwe is doing a measurement using the clamp-on ammeter method. what sort of a device is he most likely working on?

a. high-current power transformer
b. radio circuit
c. lighting circuit
d. power supply

what's resistance equal to?

a. i / v
b. w / i 2
c. v × i
d. w / v

jen is trying to discover if a motor has failed windings. what sort of test can she do?

a. short circuit test
b. voltage test
c. continuity test
d. ac current test

a high-voltage probe should always be used whenever you measure voltages near or above

a. 500 vac or vdc.
b. 100 vac or vdc.
c. 1000 vac or vdc.
d. 750 vac or vdc.

one watt of electrical power is produced when

a. electrical pressure is present in a circuit.
b. a conducting path is present between two opposing electrical charges.
c. one ampere of electrical current flows due to an applied voltage of one volt.
d. work is done to move electrons with respect to time.

xien is checking the power input terminals on a commercial installation. the voltage should be 480 v. however, the multimeter she brought only reads up to 200 v. what should she do?

a. get a different dmm, because the high voltage might damage the one she brought.
b. set it to r x 10 and do the reading there.
c. she needs a high-voltage probe for this high a measurement.
d. step the voltage down and read the stepped-down voltage, multiplying it by the step factor.

trey is testing a properly-working resistor in a circuit and finds its value to be far lower than he expects. what's going on?

a. he didn't cut a lead on the resistor.
b. the resistor is installed backwards.
c. the circuit is energized.
d. the resistor is faulty