Transcript Static electricity

1.
3
2. Where are electrons likely to be found?
a) in the nucleus b) outside nucleus c) mixed throughout an atom
3. Protons are located in the nucleus of the atom. A proton has
a) No charge
b) A negative charge
c) A positive and a negative charge
d) A positive charge
b
d
4. Neutrons are in the nucleus of the atom. A neutron has
a) A positive charge
b) No charge
c)A negative charge
d)Twice as much positive charge as a proton
b
5. The buildup of charges is called
• Static electricity
6. Lightning is an example of
_________, which is the loss of
static electricity.
• Electric discharge
7. The diagram below shows 2 electrons.
• Are they attracted to each other, or are they
repelling each other? Explain.
They repel each
other because
their charges are
the same and like
charges repel.
8. Identify the method of charging represented below.
Explain.
A
Conduction
charged by
direct contact
(touch)
B
C
Induction charged
by rearrangement
of charges (come
close but no touch)
Friction
charged by
rubbing
9. What is the difference between direct
current (DC) and alternating current (AC)?
• In DC, the electrons/current move in 1
direction (circuit connected to battery)
• In AC, the electrons/current move back
and forth, changing directions (home
circuits, from power plants)
10. Identify the type of circuit shown below.
A
Series
One path
B
Parallel
More than one
path
11. A. Which circuit below is an open circuit?
B. How is this different from a closed circuit?
Open
Closed
In an open circuit, current cannot flow bc the switch
is open. In a closed circuit, current can flow because
the switched is closed.
12. A. What does the diagram below represent?
B. Label the solenoid.
Electromagnet
• Iron core (nail)
• Solenoid (coiled
wire)
• Battery (energy
source)
• wire
13. The magnet is is being rubbed along the iron nail.
The iron nail turns into a magnet. What is this process
called?
Magnetic
Induction
14. A. What is the magnetic field of the Earth called?
B. How does it protect the Earth?
C. What happens when some of the charged
particle spiral in towards the poles?
Magnetosphere
Prevents solar winds
fro reaching Earth
(deflect them)
Auroras (Northern &
Southern Lights)
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16.
Opposite charges attract.
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2
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28.
S
N N
Opposite poles attract, like
poles repel.
29.
The paper would be attracted to the magnet
and become attached to it.
The plastic would not be attracted to the
magnet.
30.
Magnets cannot attract all metals. They can
only attract nickel and cobalt.
31. How are electric motors and generators
similar?
• They both use electromagnets.
32. How are electric motors and generators
different?
• Motors convert electrical energy into
mechanical energy.
• Generators convert mechanical energy
into electrical energy.