0
Electrical Troubleshooting
Electrical troubleshooting involves checking and resolving an electrical problem (such as when an electrical device stops working correctly). Common troubleshooting practices include checking if the power is on, the bulb has burnt out, or the breaker tripped.
885 Questions
What can cause an electrical outlet to spark?
An electrical arc, or spark, is caused by a sudden jump of electrons* across a gap or space, from a higher charged, to a lessor charged object. This is why it's wise to keep fingers, metal, water, and other conductive materials away from electrical outlets. Close proximity, not actual physical contact, is what allows arcing and the electric shock associated with it.
*Note: An object cannot lose or gain protons.
What is the difference between KW and KVAR?
kW is the unit of real power & kVA is the unit of Apparent power.
Apparent Power= real power + reactive power
Besides this,the ratings which we write on a motor or generator is KVA & not KW. B'coz there are two types of losses in a motor or generator- core losses & ohmic losses. Core loss depends upon the voltage applied & ohmic losses depend upon the current flowing & none of these losses depend upon the power factor i.e. Cos@. As we know that
KW power = V * I *Cos@.
But as the losses are independent of the power factor hence we need to calculate only KVA = V*I.
CommentApparent power is the vector sum of real power and reactive power, not the sum.
KVA is the unit of apparent power and KW is unit of active power.
KW is kilowatts, and KVA is kilovoltamps. KW is the apparent power that a normal power meter would measure, while KVA is simply the maximum of the instantaneous product of volts and amps divided by 1000. The difference between these two terms is due to phase angle, which is due to the reactance of the load to an AC power source.
KW (kilowatts) is apparant power, while KVA (kilovoltamps) is true power. They are different when the phase angle between voltage and current is not zero, i.e. when the load is reactive, such as in a motor. The ratio of KW over KVA is Power Factor, and is the cosine of the phase angle between voltage and current. It is zero at a phase angle of 90 degree, which occurs for purely (ideal) inductive or capacitive loads with no resistance in the source or conductors, and it is one for purely resistive loads.
Wavelength is the distance between corresponding (identical) phase points of a wave, the period over which a wave or signal repeats.
In electricity, it is the amplitude of a sine wave plotted over time.
What do the electrical symbols L and N and A stand for when referring to live and neutral etc?
line neutral amperage
How do you remove a capacitor from a circuit board?
Correct method:
Two pieces of equipment are needed. A small wattage soldering iron and a de
soldering tool. Heat the junction point up until the solder melts. Use the de
soldering tool to remove the melted solder. Do the same thing to the other side
of the capacitor by heating and removing the solder. The capacitor should now
pull away from the PC board.
=====
Lazy method:
--One piece of equipment is needed. A small wire cutter.
-- Select one end/side of the capacitor. Position the jaws of the tool on
either side of the wire emerging from it. Then cut.
-- Position the jaws of the tool on either side of the intact wire emerging
from the opposite end/side of the capacitor. Then cut.
-- The capacitor should now pull free of the terminal strip or printed board.
What tests need to be carried out when commissioning bus bars?
Bus bars need to be meggered to make sure that there is no shorts between the bars and from the bars to ground. Usually electrical engineers have a list that has to be checked off and values written down before any energizing of the equipment will be allowed.
Kv and kvar and kva what different?
KV is the unit used for VOLTAGE measurement. AC power is complex quantity that is it has both magnitude and direction and hence has two parts real part and imaginary part. complex power is measured in KVA (kilo volts amps) real part (active component ) is measured in KW (kilo watts) imaginary part (reactive component) is measured in KVAR (kilo volts amps reactive)
A BX connector is a special type of box connector used for securing a BX cable to a junction box. BX is a type of armoured cable that is used for specific locations where ordinary Romex cable could become damaged. Before the connector is installed onto the BX cable there is a small PVC collar to be installed. In the trade it is called an anti short. It slides between the outer sheath of the BX and the conductors inside the sheath. It adds protection for the inner conductors from rubbing against the outer sheath if any vibration is involved in the installation. There is usually a small hole in the BX connector and the red anti short can be seen through this hole. This makes it easy for the electrical inspector to see if the anti short bushing has been installed during an inspection, and they do check.
Is a polarity test a live test?
A polarity test is not a live test; it is typically performed on a device or circuit to determine the correct orientation of connections, such as positive and negative terminals. The test can be conducted using a multimeter or a specialized polarity tester, allowing for safe checks without powering the device. It helps prevent damage to components by ensuring proper connection before live operation.
Can bulbs be used in the same circuit with LED's?
If your reference to bulbs is light bulbs then yes they can be mixed. The led lamps have to be ballasted to use them in home lighting.
If your meter is running with no load connected, meaning your main breaker is off, call your utility company and notify them of the problem. There is no reason a meter should be turning with all loads disconnected. Some people suggest to get video evidence of the meter running with your main breaker disconnected. Supposedly this may make getting reimbursed from your utility company easier.
If the resistance and reactance of a circuit are 2 ohms 4ohms.respectively what is the impediance?
Impedance = √(Resistance2 + Reactance2 )
= √(22 + 42)
= √(20)
= 4.47213595
Why use 24 volt and not 12 volt?
More cranking power.
The same reason, if your trying to fill up a swiming pool. The more or higher pressure of flow of water will fill the pool up faster... more water in less amount of time. More voltage more flow of electrons in a given time and the higher the voltage the lower the amperage draw or current pull... you could use a smaller wire and not worry about it overheating and failing. theres a lot to take in consideration for the application.
The military uses 24v systems for several reasons. One is for cranking--and when big diesels started using electric starters, those starters were all 24v. (New heavy-duty diesels use 12v starters.) Another is for the radios we used to have. The old AN/VRC-12 series radios (VRC-12, VRC-46, VRC-47 among them) had vacuum tubes in the power amplifiers--the radios were designed in the 1960s, when they didn't have transistorized final amplifiers as big as the Army wanted. Tubes need high voltage to work, and it's easier to get to 350v if you start at 24v than if you start at 12v. The current generation of radio has a transistorized amp in it. The real reason they stick with 24v is commonality: if they went to 12v systems the warehouses full of truck parts, communications gear and everything else that can be used in a vehicle would work on only part of the fleet. They don't want a situation where they issue a troop a 12v radio to install in a 24v vehicle and the radio fries, or where they issue him a 24v chemical agent alarm to install in a 12v vehicle and his whole outfit dies from the nerve gas attack the alarm didn't tell them about.
For large vehicles using a lot of power especially for cranking the engine, 24 v is used because on 12 v the connecting wires would have to be of a heavier gauge . . . copper is expensive.
Why is residential work so important for electricians to get right?
It is not just residential that has to be installed right, it is all electrical work that has to be installed correctly. Electricity is dangerous and can do the body a great amount of harm. It is the electrician's responsibility to do the job correctly and foremost to do it like it is stated in the electrical code book. Electrical contractors are being paid by their customers to give them a correctly installed and safe product. The majority of electrical installations are not inspected by an electrical inspector based on the contractor,s good reputation. This puts the onus on the contractor to provide a top grade installation to keep in the inspectors "good books". If you, the customer have any doubts about an installation that has been installed for you, request a meeting with your electrical contractor and the electrical inspector for your area at the site of the installation. At this time an explanation will be given to you about your concerns by the electrical inspector.
What are some common problems with a 1992 Chevy silverado 2500?
Most 2500's have no real problems. Issues are normally small. Almost all Chevy trucks have mild electrical problems. and ignitions have a tendency to break, but it does not happen to everyone, it happens on maybe 1 out of 10 trucks. I have a 1992 Chevy 1500 ext and it has 190,000 miles on it no major problems that would have totaled the truck.
i have had to replace the water pump 3 times, radiator once, AC/Heater blower once, starter and solenoid once, fuel pump once, and i need to replace the AC/Heater controller.
Mind you it might seam as if a lot of stuff was just breaking off of this truck but that is everything my family has done to that truck aside from regular fluid and filter changes. all in all it is an 18 year old truck, (my grandfather bought it a week after i was born), that has lasted a long time and we foresee it running for many more years to come. and when the time comes we will rebuild it. it is our version of a heirloom.
i hope this has some answer you need,
WM
How do you know Ryb phases when color coding is not there?
First of all, the colours red, yellow, and blue, are applied to LINES not to phases!
To determine which line is which, you must compare them with lines that are identified. This process is known as 'phasing out', and is difficult to explain without using a diagram. I suggest you check out 'phasing out' on the internet.
