Fundamentals Of Electricity Flashcards
Which test instrument is used to read electrical pressure?
Volt meter
The_______is used to read the current flowing through the conductor
Amp meter
To read voltage the meter probes are placed_________the switch or the load
Across
Which test instrument has its own power source
Ohm meter
If the clamp-on ammeter is around one L1 conductor and one L2 conductor the reading will be?
Incorrect
The rules for operating the________is, turn the power off, isolate the component, select the proper scale and zero the meter
Ohm meter
What are the rules for using the clamp-on meter ammeter?
Only clamp one wire at a time
The rules for using the voltmeter are?
Start at the highest rang if voltage is not known
What is the power source used to energize the voltmeter?
Source voltage
When using the voltmeter, if voltage is read across the switch being tested, is the switch opened or closed?
Opened
A complete circuit is when_____is read across the load
Voltage
If voltage is read across the load, but the load is not energized than the load is?
Bad
What is the diagnosis if power is applied to the system but no voltage is read across the load?
Open circuit
To find a bread in the circuit a troubleshooting procedure called_________is used
Hopscotch
Which method of testing a fuse is more reliable, using the voltmeter or using the ohmmeter?
Ohmmeter
When testing motor leads to determine common, start or run, which test instrument is used?
Ohmmeter
Between which two terminals will you test the highest ohm reading?
Between run and start
When testing a motor winding with the ohmmeter and zero ohms is read, what is the diagnosis?
It’s a short motor winding
When testing a motor winding with the ohmmeter and infinite is read, what is the diagnosis?
It’s a open winding
If a measurable reading is indicated across the motor winding, what condition does this indicate?
The windings are good
A shorted run winding would read 0.0 between what pins on the compressor?
Common and run
If the start to common ohm reading is 12 ohms and the run winding is, shorted what would you read between start and run?
12 ohms
If a measurable reading is read between run and start, but infinite between common and run and common and start, what is the diagnosis?
Open I.P.
A________ _________rated at 2 watts and 20,000 ohms is used to discharge capacitors
Bleed resistor
The only truly reliable method of testing capacitors, is to use what testing instrument?
Capacitor analyzer
On dual capacitors, witch motor windings are connected to the common terminal?
Run and start
The rules for replacing run capacitors are, voltages____________and the microfarad rating is the same
Same or higher
When testing a run cap the microfarad rating should be within + or - __________unless a smaller allowance is on the label
10%
If two run capacitors are wired parallel, one is rated at 15 mfd and the other is rated at 10 mfd, what is the total capacitance for the motor?
25 mfd
If the run capacitor is__________the start winding will draw higher than normal amperage
Decrease MFD rating
When testing a PSR what ohm reading would be expected across pins 2 and 5?
3,000 to 14,000 ohms
A start cap is using a 2 watt 20,000 ohm resistor across the terminals to protect the____________from welding closed when the PSR contacts are closed
PSR contacts
