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To increase the brightness of a desk lamp a student replaces a 50 W light bulb with a W light bulb. Compared to the 60 W light bulb the W light bulb has? An electric dryer consumes 6. During operation the dryer draws a current of approximately?
When 8. The work function of the photo emissive surface is. A high resistance is connected in series with the internal coil of a galvanometer to make? In a transformer, two coils are wound around a common iron core. Which device can be used to increase voltage from a source of direct current? The transformer on a power pole steps down the voltage from 10, volts to volts. If the secondary coil contains turns, how many turns are found on the primary coil?
An electric motor draws amperes of current while operating at volts. What is the power rating of this motor? What is the potential difference across a 2. If a ohm resistor is connected in parallel with a 30 ohm-resistor, the equivalent resistance is?
A metal wire has length L and cross-sectional area A. A wire carries a current of 2. How many electrons pass a given point in this wire in 1.Some of the functionality and menus may not be available with this browser.
There are many different sources of power disturbances - some you can prevent and solve yourself and some you cannot. This page outlines the most common disturbances and offers solutions. The surprising nature of many electrical disturbances. While lightning, ice storms, high winds, trees falling on power lines, car-pole crashes, normal electric circuit operations - even birds and squirrels - cause their share of power disruptions, most disturbances are caused by the day-to-day operation of ordinary household equipment and appliances.
These include heating and air conditioning systems, refrigerators, washing machines, pumps, fans and the like. Household appliances like vacuum cleaners and blenders, and power tools like saws, sanders and drills are another common cause of electrical disturbances. What electrical disturbances can do to modern electronic equipment.
Depending on the type of disturbance and the equipment involved, the effect of power disturbances may range from instant breakdown to more gradual deterioration over time. Either way, electrical disturbances can eventually put your valuable equipment out of commission as surely as any lightning bolt.
Electronic devices don't even need to be in use to be vulnerable to damage. Many have built-in timers, internal clocks, remote controls or other systems that are always running, even when the item itself is turned off. Spikes are brief bursts of too much voltage. Surges are also bursts of additional voltage but last a bit longer.
Both can be caused externally by events like storms and accidents, or internally by things like air conditioners, power tools, coffee makers or microwave ovens being turned off, either automatically or by hand.
Spikes and surges can destroy electronics instantly or over time. Among the things most susceptible to spikes and surges are TVs, VCRs, home computers, stereo systems, microwave ovens, electronic video games and telephone answering machines. Security systems, digital thermostats, refrigerators and many other common home appliances can be damaged by them as well.
Many devices designed to suppress spikes and surges are available commercially but all are subject to wear over time. Solution: Plug-In Surge Protectors shield individual pieces of electronics in your home from spikes, surges and electrical noise that originate inside the home, and offer measure of protection from outside disturbances.
Sags and dips are brief periods of low voltage. Outages or blackouts are periods when there is no electric power.
These can last from less than a second to minutes or even longer. While sags and dips can be caused when an electrical device draws power as it is turned on, outages are usually caused by severe weather, accidental damage to your power company equipment or electrical short circuits created inside your home. Sags, dips and outages can cause data loss or physical damage to computers and other devices that use memory, like VCRs, microwaves, faxes and answering machines.
Solution: To protect equipment against these disturbances, as well as most other types, Uninterruptible Power Supply UPS Units can be useful in saving both equipment and work. Mainly for use with computers and related equipment, these operate "online" to filter out all types of power problems and provide disturbance-free electricity during normal operating conditions. In case of a power outage, the UPS special battery back-up systems supply 15 to 20 minutes of reserve power depending on the protected load and assuming all sizing instructions have been followedallowing you time to save your data and shut down your equipment safely.
Static interference and harmonic distortion are electrical disturbances caused, for example, by air conditioners, vacuum cleaners, hair dryers and cordless phones. A leading cause of electrical trouble for home computers, they can also create serious problems for stereo, radio, security and phone systems.
TVs, VCRs, digital thermostats and refrigerators can also have their performance hurt by these power disturbances. Still need help? Contact us with your questions. Log In OR Register. Troubleshooting Electrical Problems. Sags, dips and outages Sags and dips are brief periods of low voltage. Other common problems Static interference and harmonic distortion are electrical disturbances caused, for example, by air conditioners, vacuum cleaners, hair dryers and cordless phones.Speak now.
Electricity makes our lives so much better that it has become an integral part. But just how much do you actually know about electricity? Do you know enough to answer an entire quiz? What are the two main uses for electricity in electrical engineering? What are the two types of electric charges? Get all of them right and everyone will have a shock. Electricity Trivia Quiz. This quiz will test your knowledge on the various terms and concepts associated with electricity. Sample Question.
Electricity And Ohms Law. The presence of electric charge as discussed is what is known as electricity. We use electricity in different circumstances and it runs most of the machinery.
Electricity: Electric Circuits
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EPROM means erasable programmable read-only memory. This is a type of PROM that can be completely removed or erased if it would be exposed to ultraviolet rays. Once the data has been erased, it can be reprogrammed so that new data can be stored.
What are some ways to save electricity?Are you stumped by a home wiring project or problem? There are a number of options available for you. The answer to your question may already be posted in an article, video or wiring diagram. Everything available on the website regarding this keyword will be displayed in the results. Magnifi is an innovative peer-to-peer knowledge sharing app that connects experts with knowledge seekers in real-time through paid, by-the-minute video or voice conversations.
Electrical Engineering Questions and Answers
To access this service, go to the Apple Apps store and download the free app available only in IOS at the moment. You receive two free minutes while I determine if I can assist you with your problem or issue. Hurry offer ends July 1st. Go to my Youtube Channellike and subscribe.
Then search my videos to see if the answer to your question has been answered in one of the many free videos. If you subscribe to my Youtube Channel you will receive an e-mail notice when I have added any new home electrical wiring videos. Visit my Channel by clicking here. Ask Questions Are you stumped by a home wiring project or problem?
At the top right of every page you will see a search box. No luck or need more information? Ask the Internet Electrician a Question I can answer your questions using any of the following options: Magnifi: Magnifi is an innovative peer-to-peer knowledge sharing app that connects experts with knowledge seekers in real-time through paid, by-the-minute video or voice conversations. Terry Peterman, the Internet Electrician. Switches Receptacles Lighting Outdoor.Here you can find Electrical Engineering interview questions with answers and explanation.
IndiaBIX provides you lots of fully solved Electrical Engineering questions and answers with explanation. Fully solved examples with detailed answer description, explanation are given and it would be easy to understand.
Here you can find objective type Electrical Engineering questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided. You can easily solve all kind of questions based on Electrical Engineering by practicing the exercises including shortcut methods to solve problems given below.
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Electrical Engineering Interview Questions and Answers Here you can find Electrical Engineering interview questions with answers and explanation.
Why Electrical Engineering? How to solve Electrical Engineering problems? Current AffairsInterview Questions and Answers.Understand that not all electrical problems are going to be related. My experience when troubleshooting electrical wiring has revealed that some electrical problems can be attributed to human error.
Other failures occur due to faulty or incorrect wiring that eventually goes bad, then there are times when electrical equipment or devices fail because of bad connections which may be aggravated by environmental conditions such as moisture.
My primary goal of this web site is to help people understand what is involved with the home electrical systems so we don't have to end up troubleshooting your house electrical wiring problems. Usually there is a logical reason why an electrical failure has occurred. Identifying Home Electrical Problems and Electrical Wiring Failures Here is a simple formula for Troubleshooting Home Electrical Wiring that will help solve your electrical problem: I must admit that my father loved troubleshooting!
He would rather take on the task of troubleshooting electrical wiring then he would construction jobs, he was the Best Troubleshooter there was; and I'm glad to say that I listened and paid attention to his teachings about troubleshooting. Many times it pays to be quiet and just observe. Ask questions - then Listen, and the pieces to the puzzle start to appear. Quick Checks just to make sure : Is the Switch "On"? Is the Light Bulb burned out? Is a Circuit Breaker tripped or a Fuse blown - If so find out why!
Sometimes troubleshooting is easy and extremely obvious - like a switch that was forgotten about or yes - the darn light bulb was just burnt out. You may even discover that a GFCI receptacle or breaker was tripped. There have been times when the tripped GFCI Plug was behind a pile of boxes in the garage and no one ever knew there was a plug there. Well, I could go on and on with stories about troubleshooting electrical wiring, but lets get to a method that could save you a lot of time, frustration and a bunch of money.
The method I've learned is an easy one, and you've probably already used it several times on other applications, here it is: The Process of Elimination Which Starts With Identification Safety First Be sure not to work with energized wires or circuits. Identify the circuit and shut it off, then tag the circuit to keep it off. Before testing, make sure to cap your wires with wire nuts or insulate them with electrical tape when you need to turn the circuit back on.
Identify the Hot wire coming in with Red or Black electrical tape so you can identify this wire from all the others. This is what I call "flagging the hot wire" Very Important: If you don't feel comfortable working on your electrical problem, please don't take chances - call a professional electrician.
Here is the process Make sure to identify which cable provides the power coming in. Do not work on the circuit with the power on. Turn the power off and label the circuit so others know you are working on it.
Positively identify all the cables - what cable goes where. Check all devices served by each cable. Disconnect any devices that may be connected to any associated cable. Check these devices to see if they are malfunctioning.