Transcript Static Electricity

By
PARTHIBAN.N
 Static electricity
 Neutral
 Electrostatic
 Comb
 Turboelectric series
 Hair
 Electrically charge
 Rub
 Negative charge
 Positive charge
 Proton
 Electron
 Attract
 Repulse
 Neutron
 A stationary electrical
charge that is built up on
the surface of a material
OR
Imbalance of Positive and
Negative charges
–
+
+
+
–
Proton (positive charge)
neutron (neutral)
+
–
–
atom
nucleus
electron (negative charge)
Only electrons may be lost or gained
The object If the atom loses electrons, it
will become +.
If the atom gains electrons,
it will become –
Rubbing materials does NOT create electric
charges. It just transfers electrons from one
material to the other.
When a balloon rubs a piece of wool...
–
–
–
–
–
–
+
+
electrons are pulled from
the wool to the balloon.
The balloon has more
+
electrons than usual.
+
+
The balloon : – charged
wool
+
The wool
: + charged
Some Cartoon which show’s formation of
STATC ELECTRICITY
Causes of static electricity
 Contact-induced charge separation
 Turboelectric effect
 Pressure-induced charge separation
 Piezoelectric effect
 Heat-induced charge separation
 Pyroelectric effect
 Charge-induced charge separation
 Electrostatic induction
Static build-up in flowing flammable and ignitable materials
 The flowing movement of finely powdered substances or through
mechanical agitation can build up static electricity.
 Dust clouds of finely powdered substances can become combustible or
explosive.
The ability of a fluid to retain an electrostatic charge depends on its
electrical conductivity. When low conductivity fluids flow through pipelines
or are mechanically agitated, contact-induced charge separation called flow
electrification occurs.
Fluids that have low electrical conductivity (below 50 pico siemens/m), are
called accumulators.
Fluids having conductivities above 50 pico siemens/m are called nonaccumulators
"Static Electricity" means "High Voltage"
"STATIC ELECTRICITY" is not unmoving,
it really means "HIGH VOLTAGE ELECTRICITY."
Static electricity is high voltage?.....
High voltage has all the characteristics of
"static electricity."
STATIC ELECTRICITY is HIGH VOLTAGE at low current.
WHAT'S THE DIFFERENCE BETWEEN
“STATIC” AND “CURRENT” ELECTRCITY
How are "Static" and "Current" different?
THERE ARE TWO KINDS OF ELECTRICITY,
STATIC ELECTRICITY AND CURRENT
ELECTRICITY. STATIC ELECTRICITY IS
ELECTRICITY AT REST, WHILE CURRENT
ELECTRICITY IS ELECTRICITY IN MOTION."
"Static" Electricity “ versus "Current" Electricity
Static discharge
Lightning
Lightning is a dramatic natural example of
static discharge
The static charge in air typically breaks
down in this way at around 10,000
volts/centimeter (30 kV/cm) depending on
humidity
The discharge superheats the surrounding
air causing the bright flash, and produces a
shock wave causing the clicking sound.
The flash occurs because the air in the
discharge channel is heated to such a high
temperature that it emits light by
incandescence.
The clap of thunder result of the shock wave
created as the superheated air expands
explosively
Removal and prevention of static electricity
ANTISTATIC AGENT
1.
Humidifier
2.
Air Ionizers
ANTISTATIC DEVICE
Antistatic Bag
Antistatic Strap
How does a positively charged rod attract a neutral
object?
When a + charged rod is put near neutral object,
______________ is induced on the side of the object
near the rod and _____________ is induced on the side
away from the rod. The rod can attract the netural object
because _________ between rod and – induced charge >
the ________ between rod and + induced charge.
How does a positively charged rod attract a neutral
object?
When a + charged rod is put near neutral object,
negative charge is induced on the side of the object
______________
positive charge is induced on the side
near the rod and _____________
away from the rod. The rod can attract the netural object
attraction between rod and – induced charge >
because _________
repulsion between rod and + induced charge.
the ________