Electronics Engineering

Need more info to give you the most usefull answer. However, generically speaking, sounds like what you need is a 120v relay. Put the relay output contacts in series with the fan (aka the load) then wire the relay coil in parallel to the light bulb power. This will make the load come on when the light is powered on. Tip, if the fan is driven by an induction motor (most are, if it has brushes it is NOT an induction motor) then your speed controller will have to be the kind for an inductive load ( NOT the kind for a resistive load, like a lightbulb ). Good luck.

Circuit breakers can often trip when a light bulb fails just at the point when you switch on the light. The reason it happens is that, in normal use, the bulb's filament gets thinner and thinner and more and more brittle over time.

Eventually it is about to fail - also known as "burn out" - but it doesn't usually do it whilst it is still burning because it's resistance is at its highest when it is hot and "lit", so it is taking the least amount of current whilst it is "on".

But then, if you switch that bulb off as normal, when you next come to switch it on its filament will be cold and its resistance will be lower than when it was hot. At the point of switching it on it draws a higher starting current for the last time but then, as the filament finally "snaps", the "flying ends" of the snapped filament can sometimes momentarily short-out the hot and neutral filament feed wires, taking a very high current which trips the circuit breaker!

Any incandescent light bulb will draw a higher starting current when you first switch it on because, when cold, the filament resistance is at its lowest point. The bulb soon heats up to its normal running temperature at which point the current settles to its normal running current which is lower than its cold starting current.

But in the case of a bulb that has been used for near to - or more than - its designed number of hours, then it is much more likely to fail in a way that causes the circuit breaker to trip, as has been described above.

Provided they have not been "knocked or dropped" at some time during their life - which would significantly shorten their actual expected "life" because of mechanical damage to the filament - ordinary incandescent bulbs are rated for only about 1000 hours of actual use. More expensive "long-life bulbs are available that are rated at 2000 hours.

A different answer

If your home is new and has the new type of arc-fault breakers, this occurs from time to time when the filament in the bulb blows because the failing bulb causes an arc and the breaker does what it was designed to do: stop the arc.

Unit 731 was basically constructed in order for the Japanese to test the affectiveness of their weapons on their civilians of Northern China, or 'Manchukuo' at the time. They tested and devised various ways of devastating the people of China and other enemy Asian countries (such as creating plagues, epidemics and famines) after testing on the Northern Chinese (cutting them up, injecting air into arteries, placing in pressure chamber, injecting diseases). Unit 731 was simply a way the Japanese tried to plan to kill and torture the Chinese and other enemy Asians, in the most affective and cruelest ways.

Unit 731 (731 部隊) was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino-Japanese War (1937-1945) and World War II. It was responsible for some of the most notorious war crimes carried out by Japanese personnel.

Vivisection

Prisoners of war were subjected to vivisection without anesthesia. Vivisections were performed on prisoners after infecting them with various diseases. Scientists performed invasive surgery on prisoners, removing organs to study the effects of disease on the human body. These were conducted while the patients were alive because it was feared that the decomposition process would affect the results. The infected and vivisected prisoners included men, women, children, and infants.

Vivisections were also performed on pregnant women, sometimes impregnated by doctors, and the fetus removed. Prisoners had limbs amputated in order to study blood loss. Those limbs that were removed were sometimes re-attached to the opposite sides of the body. Some prisoners' limbs were frozen and amputated, while others had limbs frozen then thawed to study the effects of the resultant untreated gangrene and rotting.

Some prisoners had their stomachs surgically removed and the esophagus reattached to the intestines. Parts of the brain, lungs, liver, etc. were removed from some prisoners.

In 2007, Doctor Ken Yuasa testified to the Japan Times that, "I was afraid during my first vivisection, but the second time around, it was much easier. By the third time, I was willing to do it." He believes at least 1,000 people, including surgeons, were involved in vivisections over mainland China.

Weapons testing

Human targets were used to test grenades positioned at various distances and in different positions. Flame throwers were tested on humans.

Humans were tied to stakes and used as targets to test germ-releasing bombs, chemical weapons, and explosive bombs.

Germ warfare attacks

Prisoners were injected with inoculations of disease, disguised as vaccinations, to study their effects. To study the effects of untreated venereal diseases, male and female prisoners were deliberately infected with syphilis and gonorrhea, then studied. Prisoners were infested with fleas in order to acquire large quantities of disease-carrying fleas for the purposes of studying the viability of germ warfare[citation needed].

Plague fleas, infected clothing, and infected supplies encased in bombs were dropped on various targets. The resulting cholera, anthrax, and plague were estimated to have killed around 400,000 Chinese civilians. Tularemia was tested on Chinese civilians.

Unit 731 and its affiliated units (Unit 1644, Unit 100, et cetera) were involved in research, development, and experimental deployment of epidemic-creating biowarfare weapons in assaults against the Chinese populace (both civilian and military) throughout World War II. Plague-infested fleas, bred in the laboratories of Unit 731 and Unit 1644, were spread by low-flying airplanes upon Chinese cities, coastal Ningbo in 1940, and Changde, Hunan Province, in 1941. This military aerial spraying killed thousands of people with bubonic plague epidemics.

Other experiments

Prisoners were subjected to other torturous experiments such as being hung upside down to see how long it would take for them to choke to death, having air injected into their arteries to determine the time until the onset of embolism, and having horse urine injected into their kidneys.

Other incidents include being deprived of food and water to determine the length of time until death, being placed into high-pressure chambers until death, having experiments performed upon prisoners to determine the relationship between temperature, burns, and human survival, being placed into centrifuges and spun until dead, having animal blood injected and the effects studied, being exposed to lethal doses of x-rays, having various chemical weapons tested on prisoners inside gas chambers, being injected with sea water to determine if it could be a substitute for saline and being buried alive.

Biological warfare

Japanese scientists performed tests on prisoners with plague, cholera, smallpox, botulism, and other diseases. This research led to the development of the defoliation bacilli bomb and the flea bomb used to spread the bubonic plague.Some of these bombs were designed with ceramic (porcelain) shells, an idea proposed by Ishii in 1938.

These bombs enabled Japanese soldiers to launch biological attacks, infecting agriculture, reservoirs, wells, and other areas with anthrax, plague-carrier fleas, typhoid, dysentery, cholera, and other deadly pathogens. During biological bomb experiments, scientists dressed in protective suits would examine the dying victims. Infected food supplies and clothing were dropped by airplane into areas of China not occupied by Japanese forces. In addition, poisoned food and candies were given out to unsuspecting victims and children, and the results examined.