is back emf good or bad?
444019
Back emf is a measure of energy conversion from electrical to mechanical in an electric motor. If you are able to make it zero no energy conversion to mechanical. ... Eb is back emf, I armature current and R armature circuit resistance. So if you want energy conversion back emf is good.
250107
Performance for wifi extenders is BAD. ... WiFi is NON-ionising radiation and is not harmful in any way that we know of to the human body. The total charge is also so miniscule as to be negligible.
635208
Data Centres require very high power and current flow which results in higher Electromagnetic field. EMF radiation is also known to be as one of the major factors affecting the performance of a data center. ... The interference by Electromagnetic fields is extremely harmful for IT equipments and data center environment.
1469435
A study produced in America in 2000 found that even a few minute's exposure to EMFs can lead to depression, headaches, moodswings, anxiety, lack of energy and leave you more susceptible to disease. {1}Electric blankets create a magnetic field that can penetrate roughly six inches into the body.
197130
The main effect of radiofrequency electromagnetic fields is heating of body tissues. There is no doubt that short-term exposure to very high levels of electromagnetic fields can be harmful to health.
587042
That is, when a motor is doing work and its shaft is turning, an emf is generated. Lenz's law tells us the emf opposes any change, so that the input emf that powers the motor is opposed by the motor's self-generated emf, called the back emf of the motor (Figure 10.6.
827623
The magnetic field is not harmful, but it may cause some medical devices to malfunction. Most orthopedic implants pose no risk, but you should always tell the technologist if you have any devices or metal in your body.
1006926
Vibration therapy may be dangerous if the intensity of the vibrations is too high. This may cause lumbar injuries and severe back pain.
951706
Based on comprehensive research conducted over the course of three years, the EM-Safety project has reached the conclusion that the electromagnetic fields (EMFs) in electric cars are well within the safety limits. The partners measured the fields generated in test vehicles and analysed their biological effects.
785330
An emf is induced in the coil when a bar magnet is pushed in and out of it. Emfs of opposite signs are produced by motion in opposite directions, and the emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important.
561979
Turning off electronics will not protect them because the EMP is the source of energy that induces current in electronics. The only way to protect them would be to place them in a Faraday Cage. ... So if the EMP is not strong enough to destroy the circuit directly removing the supply voltage helps.
712929
EMF Protection Tip 1 – Understand about EMF Penetration Low frequency radiation does not bounce off walls or floors – it just goes straight through. In fact, it will penetrate anything – brick, metal, concrete, and you – without any trouble. Nothing blocks low-frequency EMF.
908065
A sudden loss of power, such as during a power outage, may result in electronics data loss, and repeated instances may cause bad sectors in a hard drive. However, the real danger comes the moment electricity is restored. Overvoltage sometimes surges through power lines, posing a risk to the electronic devices.
1296744
Where there are concerns, they are mainly about magnetic fields. Most people get most of their exposure to EMFs from the distribution wires along the street and from wiring in the homes. We also get short-duration higher field exposures when we pass close to electrical appliances.
476945
The study concludes that the RF-EMF may induce oxidative stress with an increased level of reactive oxygen species, which may lead to infertility. This has been concluded based on available evidences from in vitro and in vivo studies suggesting that RF-EMF exposure negatively affects sperm quality.
287180
Hybrid and electric cars may be cancer-causing as they emit extremely low frequency (ELF) electromagnetic fields (EMF). ... Thus, even if EMF measurements comply with the ICNIRP guidelines, occupants of hybrid and electric cars may still be at increased risk for cancer and other health problems.
674275
Large doses of radio waves are believed to cause cancer, leukaemia and other disorders. Some people claim that the very low frequency field from overhead power cables near their homes has affected their health, although this has not been reliably proven.