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問題一覧
1
is the phenomenon associated with either stationary or moving electric charges.
electricity
2
the source of the electric charge could be an
elementary particle
3
elementary particle
electron, proton, ion
4
negative charge
electron
5
positive charge
proton
6
any larger body that has an imbalance of positive and negative charge
ion
7
positive and negative charges
attracts each other (electric charge)
8
like charges
repel each other
9
is defined as the physical phenomenon produced by moving electric charge
magnetism
10
produces attraction and repulsion between objects
magnetism
11
electricity is based on
positive charges, negative charges
12
there is no known
magnetic monopoles (magnetism)
13
any magnetic particle or object has a
north pole, south pole
14
with the directions based on the orientation of the Earth's magnetic field
north and south poles
15
4 types of magnets
u-shaped magnet , bar magnet, ring magnet, horseshoe magnet
16
likes poles of a magnet (magnetic pole)
repel each other
17
opposite poles
attract one another
18
The word electromagnetism comes from a combination of the Greek works
elektron, magnetis lithos
19
elektron, meaning
amber
20
magnetis lithos, meaning
magnesian stone
21
which is a magnetic iron ore
magnesian stone
22
were familiar with electricity and magnetism, but considered them to be two separate phenomena.
ancient greeks
23
are closely related
electricity , magnetism
24
generate a magnetic field
power lines
25
rotating magnets in a generator produce
electricity
26
is a device which is used to produce electric energy, which can be stored in batteries or can be directly supplied to the homes, shops, offices, etc.
electric generator (generator)
27
electric generators work on the principle of
electromagnetic induction
28
a copper coil tightly wound onto a metal core
conductor coil
29
is rotated rapidly between the poles of a horseshoe type magnet.
conductor coil
30
The conductor coil along with its core is known as
armature
31
is connected to a shaft of a mechanical energy source such as a motor and rotated.
armature
32
can be provided by engines operating.on fuels such as diesel, petrol, natural gas, etc. or via renewable energy sources such as a wind turbine, water turbine, solar-powered turbine, etc.
mechanical energy required
33
it cuts the magnetic field which lies between the two poles of the magnet.
when coil rotates
34
will interfere with the electrons in the conductor to induce a flow of electric current inside it.
magnetic field
35
work per unit charge
voltage
36
is a machine that can convert electric energy into mechanical energy (specifically kinetic energy, or the energy of motion).
electric motor
37
This is typically achieved by exploiting the relationship between electricity and magnetism.
electric motor
38
may be powered by an AC current, such as that flowing from your wall outlet, or DC current such as that supplied by a battery.
electric motors
39
The basic principle behind an electric motor is that there needs to be a ______ that is free to rotate in the presence of an external magnetic field.
coil of wire
40
is passed through the wire coil
current
41
the interaction between the current and the field produces
torque
42
causing the coil to rotate.
torque