Humidifier aromatherapy oils

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Q:I measured it with a CRO in the physics lab and I was wondering what could be its source: That is a period of about 62 hours or 2.5 days! Are you sure you measured this with an oscilloscope, or does CRO mean something else to you? Maybe the motion of the planets, earth, moon, etc. I don't know? Do you mean a period of 4.5 microseconds? That would be 222kHz perhaps EMI from a computer, other electronic gear, short wave radio, etc. If you can clarify, I might be of more help. Edit: OK; I have a couple of ideas, but it can be DIFFICULT to find. I spent a long time trying to track down the source of 70MHz in my lab. Turns out there is a TV station (channel 4) transmitting about 1 mile away. Channel 4 occupies the space between 67.31MHz and 71.75MHz. 222 KHz has a wavelength of about 1350 meters. It takes a pretty big antenna to launch that as a traveling wave so I'm going guess its a near field source. A good way to look for it is to make a small loop antenna with a few turns of magnet wire (maybe a few 10s of cm in diameter) and hook it to your oscilloscope. Walk around with it putting it near any and all electrical equipment that is in or near your lab. Make sure to change the orientation of the coil when you are moving around. You are basically playing a game of hot and cold. Try to maximize the signal and in theory you should be near the source. Also, be suspicious of the lights. I know their source is 60Hz, but some electronic ballasts for fluorescents run at a pretty high frequency, at least 10's of KHz, you could be seeing a harmonic. Just try flipping the lights on and off looking for a change in amplitude of the signal on the scope. If this doesn't find it, then perhps it is far field? I don't know of any commercial braoadcasts at this frequency though. The low end of AM radio is around 500KHz. Maybe you have an active Ham radio operator in the neighborhood? I wouldn't think he would be transmitting all of the time though is this 'noise' always present? Hope this helps. Let me know if you find it. Dave

Q:1 explain the difference btween a conductor and an insulator in terms of the transfer of electrons. Why are problems with static electricity common in winter than at other times of the year? How could any of these problems be reduced?Why is cleaning dusting more difficult in winter?List at least 2 reason why you think plastic materials are used to cover the copper wires in electrical equipment.: 1. In a conductor, electrons transfer easily from atom to atom. In an insulator, it is extremely hard to cause electrons to shift atom to atom. (edit) This means an electrical current cannot flow in an insulator, as electrons must move in a conductor. (end edit). 2. In winter, the air contains less moisture. Therefore static charges will not dissipate as quickly as they will in moist air, and are more easily generated. 3. For the above reason, moving dust particals can easily induce a charge in them, which will be of opposite polarity to the surface. They can be attracted back to the surface. Using a slightly moist cloth can help when dusting in winter. 4. Plastics etc. are electrical insulators. Plastic insulation is very easy to apply to a conductor by extrusion around the conductor, in a plastic extrusion machine. The material is heated to a suitable plastic constituency. Plastic insulations are NOT used in extreme heat or cold situations for conductors. If you live in the US, you will see lots of rubber insulated power leads, as plastics can get more brittle and fracture in cold conditions. Plasticity is the state between solid and liquid, which is where all plastics are worked. In fact, many materials other than plastics can be worked in a plastic state, even metals!

Q:How does electrical copper wires aid to temperature rise?! I don't think it is also associated with carbon emission as carbon emission mostly come from vehicles and manufacturing industry.: It takes energy to send an electrical signal down a wire, and the longer the wire is, the more energy you will end up using as a result. So longer wire more energy wasted in the wire. As most electrical systems are powered by mains electricity, and they are in turn powered by fossil-fuelled power stations, longer wires more energy wastage more carbon emissions from the power stations. So, carbon emissions are lowered if shorter, and therefore less, wires are used. Also, copper has to be mined which causes local environmental damage as well as carbon emissions in the production and transport of the copper. as carbon emission mostly come from vehicles and manufacturing industry. The breakdown of carbon emissions is actually approximately 30% Heating, 30% Vehicles and 30% electrical power. As 30% of emissions are due to electrical power, clearly, using less electrical equipment would reduce carbon emissions, presuming that there is not a shift to fully renewable power generation such as wind and solar. EDIT: Spongebob, of course its a made up termwords don't just pop out of thin air you know. Still arguing against AGW James? We've moved on.

Q:Affect Health? Noise problem?: Depends on the devices, I lived below a cell tower (literally 1m over head, installed on the top of my building). After doing as much research as I could on it, I found that no one really knows for certain the effects of radio waves on humans. If your major concern is just large voltage electricals, the greatest risks are fire, a small magnetic field might interfere with your devices occasionally, and constant low hum.

Q:i pods,cameras,nentendos, ect: All those are allowed on the plane. You cannot use anything that has wireless turned on - so cell phone games can be played if the wireless part of the cell phone can be turned off. Computer is OK if you can turn off wireless internet (won't work up there anyway). Please bring headphones so that you don't annoy neighbors.

Q:I saw something about people who have problems with electrical equipment. Also lights flicker or go on and off or dim. The devices either will not work or act strangely for no apparent reason. There is nothing wrong with the equipment because it will work fine for any other person. There is a metaphysical term for people like this. They also tend ot hear static or voices when tv/radio or computers or off. It has to do with some kind of extra sensory. I am not completely sure though. Does anyone know anything about this? What does it mean?: Hi Ditto. There is a school of thought that believes all living and non living things have their own electrical properties or spheres. Each individual is classified as living thing hence has his/her own electrical property. Sometimes his/her electrical property vibrate on the same frequency with other electricalelectronic devices in his/her vicinity depending on that person state of living. It's usually a temporary state of an affair which will pass eventually.

Q:how we can design the power rating of any electrical equipment. as per my understanding only way is is to change the resistance of coil( winding if motor, filament if lamp).if it is correct then the equipment will be burn if resistance is low for low power rating. Eg. resistance of filament of 10 w lamp is lower than the resistance of 100 w. generally life of 10 w lamp is higher than 100 w. but in electrical point of view the life of high value of resistance equipment will be higher than the low value value of resistance. means, 10w bulb will glow longer time comparatively 100 w bulb. since 10 w bulb has high resistance , so this bulb's life should be higher than 100w bulb. can anyone explain how to design the power rating of any electrical equipment in line of other electrical parameters.: Most equipment involves loadings on all the materials used and these materials have various load-carrying limitations. Design essentially balances these against each other whereby the materials' limitations often interact on the design. For existing design variation much empirical data and experience data will be available which will accelerate the design process but for a competely new design, the process may be iterative and toward the end may even need several prototypes to be built and tested. You can't merely change the resistance of a winding in a motor and get a higher rating. Things like core flux density and temperature-rise of insulation (affected by cooling, whatever type that may be) must all be checked. Lamp filament resistance is indeed lower for a higher rating but filament surface area (to get the radiation) and temperature will have to be decided which involves knowing and designing how the lamp radiates light and how it is cooled. The lifetime of a bulb can be quite precisely designed in, largely by the design temperature choice.

Q:i want to measure the electrical consumption of my A.C,washing meachinefridge: You can buy a plug-in energy meter for a few pounds / dollars eg energymonitors-direct .uk/s

Q:has to do with electrical control: NFPA 70 has to do with safe installation of electrical wiring and equipment. The National Electrical Code (NEC), or NFPA 70, is a United States standard for the safe installation of electrical wiring and equipment. It is part of the National Fire Codes series published by the National Fire Protection Association (NFPA). National Electrical Code and NEC are registered trademarks of the NFPA. While the NEC is not itself a U.S. law, NEC use is commonly mandated by state or local law, as well as in many jurisdictions outside of the United States. The NEC codifies the requirements for safe electrical installations into a single, standardized source. The authority having jurisdiction inspects for compliance with these minimum standards.

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