Transcript Applications of Static Electricity

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Applications of Static
Electricity
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Applications of Static Electricity
Grounding: connecting an object to a large
body, like Earth, that is capable of removing
any electric charge on the object
Applications of Static Electricity
Grounding: connecting an object to a large
body, like Earth, that is capable of removing
any electric charge on the object
Negative object: excess electrons flow from
the object to the Earth until it is neutral
Applications of Static Electricity
Grounding: connecting an object to a large
body, like Earth, that is capable of removing
any electric charge on the object
Negative object: excess electrons flow from
the object to the Earth until it is neutral
Positive object: electrons flow from the
Earth to the object until it is neutral
Applications of Static Electricity
electrostatic spray painting
electrostatic
precipitator
electrostatic duster
Paint Spraying
Summary of Paintspraying
The paint is charged as it comes out of the nozzle.
The paint spreads out in a spray due to repulsion
The car must be connected to the opposite voltage.
The paint is attracted to the oppositely charged car.
The paint is applied evenly all over
The defibrillator
Saving your life!
What is Fibrillation ?
Normal heart rhythm
In some heart conditions the electrical impulses
which are necessary for the proper operation of the
heart fall into disorder
The heart chambers flutter rather than pulse
rhythmically.
Little or no blood will be pumped like this so the
sufferer is in mortal danger.
Trace showing ventricular
fibrillation
Defibrillation
In order to save the life of someone with a fibrillating
heart a defibrillator can be used.
Electrolyte gel is smeared on electrodes (known as
paddles) which are placed on the patients body either
Side of the heart.
A large voltage is applied across these electrodes to
drive a current through the patient’s heart. This current
can restore normal heart rhythms.
If a persons heart is showing no electrical impulses then
defibrillation will not revive them.
Safety
It is important when using a defibrillator that no
one touches the patient or any exposed contacts
on the defibrillator
Or else they may become the next patient!
A big enough electric shock can cause
defibrillation.
Applications of Static Electricity
Electrostatic Spray Painting: positively
charge the object and negatively charge the
paint particles
opposite charges attract
-paint particles are attracted to the object
and less is lost as over spray
Applications of Static Electricity
Electrostatic Duster: rubbing the duster
across a surface causes the duster to become
charged by friction.
Applications of Static Electricity
Electrostatic Duster: rubbing the duster
across a surface causes the duster to become
charged by friction.
charged objects attract neutral objects
Applications of Static Electricity
Electrostatic Duster: rubbing the duster
across a surface causes the duster to become
charged by friction.
charged objects attract neutral objects
-neutral dust particles stick to charged duster
Applications of Static Electricity
Electrostatic Precipitator: a device to remove
dust particles from the exhaust gas from
industry
Applications of Static Electricity
Electrostatic Precipitator: a device to remove
dust particles from the exhaust gas from
industry
1. smoke particles pick up a negative charge
Applications of Static Electricity
Electrostatic Precipitator: a device to remove
dust particles from the exhaust gas from
industry
1. smoke particles pick up a negative charge
2. charged particles are attracted to positive
plates
3. clumps of smoke particles collect up on
trays and are removed for disposal
Applications of Static Electricity
Photocopying: selenium is an insulator but
becomes a conductor when exposed to light
Photocopiers
How it works
A Photocopier uses static charge to apply toner
(black powder) to the paper
1. A high
voltage
charged wire
transfers
positive
charge to the
drum
2. The Drum becomes charged evenly
over its whole surface.
3. Light removes charge from the parts
which are not to be printed.
4. Charge attracts toner particles.
5. Toner is rolled onto the page
6. Toner is melted onto the paper.
Applications of Static Electricity
Applications of Static Electricity