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Ask a physicist anything. (7)

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Steffenfield

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Okay, so my blow dryer is being really strange lately.

When setting it to full blast and maximum heat, it keeps cycling from hot air to just air, then back again, over and over. My bathroom lights also tend to dim just a little during each full cycle on this.

I tend to blow dry my face quite often, don't ask why, I'm just weird... Anyway, when I'm doing this I can actually see down the barrel of my dryer.

It keeps shooting off blue, electrical sparks inside of it. Sometimes they're quite huge and make a scary popping sound.

So yeah, what could cause live electricity to keep jumping around inside of my blow dryer?

Is there anything that I can do to correct this?

I guess my last question would be, is it possible for this stupid piece of a thing to kill me?

If so, how worried should I be?

Cheers! :)
 
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mzungu

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Okay, so my blow dryer is being really strange lately.

When setting it to full blast and maximum heat, it keeps cycling from hot air to just air, then back again, over and over. My bathroom lights also tend to dim just a little during each full cycle on this.

I tend to blow dry my face quite often, don't ask why, I'm just weird... Anyway, when I'm doing this I can actually see down the barrel of my dryer.

It keeps shooting off blue, electrical sparks inside of it. Sometimes they're quite huge and make a scary popping sound.

So yeah, what could cause live electricity to keep jumping around inside of my blow dryer?

Is there anything that I can do to correct this?

I guess my last question would be, is it possible for this stupid piece of a thing to kill me?

If so, how worried should I be?

Cheers! :)
There is a built in thermostat and it may be the bimetallic type. In this case it seems that the contacts are burnt and one way is to use polishing emery paper to clean them or replace the thermostat.

The arcing is what is causing the popping sound! Also check for a clogged input filter. (the rear or side of blower). If lint or hairs are obstructing the air to enter then there will be overheating and thus cause the thermostat to cut out more often!
 
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Chalnoth

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There is a built in thermostat and it may be the bimetallic type. In this case it seems that the contacts are burnt and one way is to use polishing emery paper to clean them or replace the thermostat.

The arcing is what is causing the popping sound! Also check for a clogged input filter. (the rear or side of blower). If lint or hairs are obstructing the air to enter then there will be overheating and thus cause the thermostat to cut out more often!
This is a much smarter reply!

Still, the dimming of the lights without the circuit breaker tripping worries me greatly. That should not happen.
 
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mzungu

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This is a much smarter reply!

Still, the dimming of the lights without the circuit breaker tripping worries me greatly. That should not happen.
If the house is single phase and there are runing loads then the sudden introduction of 1kW to 1.5 kw (hair driers average) will dim the lights albeit for a very short time. Also loose connections and or corroded connections can cause dimming with the introduction of heavy loads.

More details of the problem will help!
 
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Chalnoth

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What is the life-expectancy of a quark?
Quarks don't exist except in specific bound states (see color confinement), so it's a question of the life expectancy of the bound state, not of the quark itself. The second longest-lived bound state of quarks is the neutron, which has a lifetime of about 15 minutes (longer if it is in a stable nucleus). The longest is the proton, which has a lifetime so long that we don't know just how long it is. Basically, the fact that protons were produced in the early universe in excess over anti-protons forces protons to be unstable, but that lifetime has to be at least 10^34 years by current experimental evidence (it may be much longer, we don't know yet).
 
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