Are there such things that allow quick changing which circuit powers outlets/lights


Power adapters convert the electricity from one voltage to another voltage, and sometimes between AC and DC.

The quick answer to your question is to multiply the INPUT voltage by the INPUT current. In this case, you likely have 120 V input (if you're in the United States). So, the MAXIMUM power would be 120*0.24 = 29 W, though the actual power usage is likely less than this. With efficient power supplies, it will be better to look at the electrical requirement of your device rather than the power supply's maximum power rating. For example, if the device uses 1.2 A at 5 V DC, it would use a maximum of about 6 W. I would multiply this number by about 1.2 to account for power supply inefficiencies, so your system may use about 7.2 W max.

And here's some related information about power supply efficiency that is somewhat relevant to the question (that I wrote before carefully reading the question):

The INPUT is what sort of electrical system you need to supply to...

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I'm in an American house sitting in a jurisdiction that applies NEC 2014 unaltered. I've got a home office room with all the outlets on one 20A circuit. It is legal to 2014 code in all respects.

Who cares why, maybe I collect European pinball machines, maybe I just need a lot more power in the room, between my server grade PC and window air conditioner. I decide I want to convert that outlet circuit to 240V and install all NEMA 6-20 outlets. Pic

It's wired in NM 12/2 but I mark the white wire with red tape at every accessible point. Ground but no neutral. I have the requisite AFCI or GFCI breaker if required (whatever the circuit had before).

What code of Code compliance issues am I going to run into? After all, I do have outlets in all the right places.

Now suppose I also wanted to power a permanently installed light fixture. I want to use one rated for 240V. Any code issues...

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Yes, absolutely: what you want are called "wall mount plug-in lamps". You have a number of choices, e.g.:

See that pipe going downward? It's a conduit that dresses up the extension cord and protects it from getting yanked on. At the bottom is a standard plug.

These come in all sorts of shapes and sizes. I have one in my house which takes a 3-way bulb (50/100/150W) so you can get a lot of light out of them, and they often have hinges to let you swing them in and out.

Generally you will need to drill 2 holes into your drywall, hammer in a set of drywall anchors, and then attach a plate to it. (All the parts are included in the light.)

If you're renting, check with your landlord before drilling holes in the wall--but often it's easy enough to use spackle or compound to fill the holes you made, and then paint over...

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The electric circuit is the subject to be dealt with in the present article. But what does the above term really mean? We know the circuit to be a complete path, which carries the current from the source of supply to the load and then carries it again from the load back to the source.
The purpose of the electrical source is to produce the necessary electromotive force required for the flow of current through the circuit.
The path along which the electrons travel must be complete otherwise no electric power can be supplied from the source to the load. Thus we close the circuit when we switch on our electric
If the circuit is broken or, as we generally say, "open" any-where, the current is known to stop everywhere. Hence, we break the circuit when we switch off our electrical devices. Generally speaking the current may pass through solid conductors, liquids, gases, vacuum, or any combination of these. It may flow in its turn over transmission...

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This article is also available as a PDF download.

Hurricanes, tornadoes, and earthquakes aren't the only disasters that damage PCs, servers, and other computers. The abrupt loss of electricity prevents systems from closing open applications, completing replication actions, finishing disk activities, and shutting down properly. Lost data and corrupted databases and applications often result.

Powerful electrical spikes also cause trouble. A computer's sensitive electronics can easily be destroyed by electrical surges spawned by lightning strikes or power grid fluctuations.

Uninterruptible power supplies (UPSes) help prevent the damage that occurs from both power loss and common electrical fluctuations. However, just plugging in a UPS and connecting computer equipment doesn't guarantee systems are properly protected. Keep these 10 items in mind to maximize the protection UPSes provide.

#1: Data line protection is critical

Computers connected to UPS...

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Are there such things as telepathy and hypnosis? Or are they just the products of some people’s imagination? Telepathy means that you are able to pick up messages from someone else (1). Somehow you communicate without any apparent messages changing hands. This can happen between people who cannot see each other at the

time, or indeed happen to be thousands of miles away from each other. One of them is able, as they say, to read the other’s mind.

Another type of paranormal experience is connected with the strange powers (2). The best example of this is hypnosis, in which one person - the hypnotist - appears to take control of the mind of his subject. Under hypnosis people act according to the wishes of the hypnotist. Hypnosis is now used quite widely in doctor’s surgeries
and hospitals, instead of anaesthetics. Patients who respond to hypnosis do not need an anaesthetic before an operation, they only need the hypnotist (3).

The third type of paranormal...

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I am asking for a friend. They recently moved into a home built in the 90s which has a recalled Challenger electrical panel, and the company went out of business. Since they moved in, brand new appliances, as well as older ones have been dying at an amazing rate. This included a new electric blanket, a new outdoor extension cord melted, new weed eater, new fan/lights, light bulbs burning out all over the house, 3 bulbs in one fixture burning out simultaneously, fridge chirping and making odd noises, clothes dryer taking way to long to dry clothes, hair dryer blowing circuit, Jenn Aire range needing multiple visits to function and a 'smell' when it finally worked. Those are just the ones I remember she told me.

They have had the electric company check for surging and the results were negative, and an electrician come out and told them the box was fine except it needed one new breaker which was replaced. I have spent the evening reading everything, and it seems to point to a...

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A “ground fault” is an extreme event, when water or metal complete a circuit outside of the intended circuit. Direct metal-to-metal or water-to-metal electrical shorts are called “dead shorts,” and are easily detected by a GFCI device. However, when the fault in the circuit is less direct, it may not result in a dead short, but in electrical arcing, which a GFCI may not detect. In this case, as when a nail is driven into the wall and accidentally through an electric cable, the damage to the wires within can cause electricity to leap a very small gap, creating a white-hot “arc” between the not-quite-touching metal wires. Accidental arcing in an electrical circuit is just like intentional arcing with an arc-welder, with very hot temperatures resulting, sometimes exceeding...

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It is everywhere. . .

. . . Political leaders promoting changing policies.

. . . Organizational leadership touting new products or strategies.

. . . Team leaders outlining a process improvement.

Leaders everywhere think their job is to create change across their team, organization or industry.

And they are wrong.

You can create broad change across people and distance, but you can’t do it by changing the organization.

You can only achieve by helping individuals make the choice to change.

In other words, organizations don’t change, people do.

In the political arena, you’ve heard the phrase, “all politics is local.” For our purposes today let me modify it to say “All change is individual.”

So, if you agree with my assertion, how can you use that insight to get to your desired end goal of new processes, projects, products and behaviors?

Here are five things you can do.

Five Ways to Influence...

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Solutions like -E lazy_itable_init don't change the result, only speed up the process. This is what was explicitly asked yet in many cases people need more.

In most case you actually want some options that match your usage patterns and not only speed up filesystem creation but also allow faster usage and more usable space.

I just did a test. Even without using -E lazy_itable_init, the options below speed up creation time of a 2TB filesystem from 16 minutes 2 second to 1 minute 21 second (kernel 3.5.0 64bit on Intel i7 2.2GHz, 2TB disk on USB2 connection -- SATA would probably be faster).

For a filesystem that will hold large files, I use this combination:

mkfs.ext3 /dev/sdXX -O sparse_super,large_file -m 0 -T largefile4

where -T largefile4 picks options in /etc/mke2fs.conf which generally contain something like:

inode_ratio = 4194304 blocksize = -1

Do a man mke2fs for details on each of these options.

Here are relevant...

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Related: 15 Heavenly Night Skies That Can Only Be Seen From U.S. Parks

In the last few years there have been a number of attempts by designers to create environmentally friendly lighting that doesn’t need matches or outlets. These lights are being made available to people in places like Central Africa and the Pacific Islands, where the need (and the impact) is greatest.

In 2011, a team of designers in London created something called the Gravity Light that uses a heavy weight attached to a pulley to slowly turn a motor and light an LED bulb.

The company is focusing their efforts on Kenya, where the need and potential impact are high. They’re also in the process of building an assembly factory in-country. The light itself has several advantages and drawbacks. On the plus side, it’s a very simple machine that’s easy to use, and with a pulley system you don’t need to be terribly strong to lift the weight up and get it started. On the downside, the light needs to...

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"Change is the law of life. And those who look only to the past or present are certain to miss the future." -- John F. Kennedy

© 2017 IEEE GlobalSpec. All...

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As ChrisF says, check your local codes on this one. The purpose of separate circuits is to ensure that you have lights when you plug in the vacuum cleaner, hair dryer, or some other high load device. If the lights don't have any outlets, and the circuit has been properly sized, the odds of them tripping and leaving you in the dark are slim.

When adding to an existing circuit, the important question is to be sure you're not overloading that circuit. You typically want high load devices on a dedicated circuit (e.g. sump pump, AC, refrigerator). For general purpose outlets, the rule of thumb is 8 outlets on a 15 amp circuit, or 10 on a 20 amp. With lighting, I think it's limited around 10-12 per circuit, but there's a big difference if you're putting low wattage fixtures (CFL/LED) vs high wattage incandescent.

The calculation for capacity of a breaker is a target max of 80% of the breaker capacity. So 15A breaker x 80% utilization = 12A target. 12A x 120V = 1440VA. The...

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The circuit breakers in the electrical panel in your house are safety devices. Each one is designed to disconnect power when the current passing through the circuit exceeds its rating. This prevents overheated wires, electrical power surges and fires. Electrical outlets don't draw power until you plug something in, so a 20-amp circuit should theoretically be able to handle as many outlets as you want without overloading the breaker. There are practical limits, though.

Allowable Breaker Load

The National Electrical Code doesn't limit the number of receptacles you can place on a 20-amp circuit, but you'll overload the breaker if you run appliances that draw more current than the breaker can handle. The NEC does specify that a circuit breaker shouldn't handle more than 80 percent of the load for which it is rated unless the breaker is labeled otherwise. By this standard, the total current draw on a 20-amp circuit shouldn't exceed 16 amps. This allows the breaker to...

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If checking the breakers and resetting the GFCIs haven’t restored power to the outlet, the next step, without getting into circuit testing, is to remove the outlet from the box and look for loose connections.

We’ll show you three common types of loose connections: loose terminal screws, loose stab-in connections, and loose wires at wire connectors. You may find one or more of these when you remove your outlet and look in the electrical box.

Loose or broken wires The first problem we show is a loose connection under the outlet’s terminal screw. In Photo 2, you can see the charred outlet and melted wire insulation that are a result of heat generated by the loose connection. These telltale signs aren’t always present, though, which is why you should double-check the connections by gently bending each wire to see if it moves under the screw.

If you do discover a loose connection at an outlet, whether it’s at the screw terminal or a stab-in connection, we recommend...

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Let the Natural Handyman take the mystery out of 3-way circuits... and get you out of the dark!

This scene is repeated in hundreds... maybe thousands of homes every evening...

A long day... really tired... and all you want to do is go upstairs to lie down. Oh, how her feet hurt! The upstairs is dark, and as she flips the switch at the bottom of the stairs, she howls... as nothing happens! The dang 3-way switch isn't working. So, to turn the light on, she carefully negotiates the stairs to the top, and flips on the switch. That's just not the way it's supposed to be, is it?

3-way circuits can be a formidable opponent.

Countless homes across the country are plagued by miswired 3-way circuits causing not only inconvenience but a genuine safety hazard. They are very simple in function, yet ingenious in design. It only takes a few minutes, a little patience, and a healthy respect for electricity to get this job...

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Electric Outlets Don't Work

I have two outlets on one wall that don't work. I have replaced both outlets so have concluded that isn't the problem. There is power in the black wire so I assume the problem is continuity in the white wire. Other Outlets and lights on the circuit work. Any suggestions on the cause and solution would be greatly appreciated.

You checked the black wire and it was energized. Since the white seems to be the problem, then I assume you tested black to ground to determine there was juice there. But when you test black to white, you get nothing.

Thus, the white has an open some where. Do you know where the feed to the outlets comes from? Is there an outlet that feeds them, or perhaps fed from a light fixture in the floor below?

Not knowing what floor these are on, and if you have access to the ceiling below, I am not sure where to tell you to look. But you need to find where they are being fed from. Then you check to see if the...

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