Name _______ KEY __________________________________ Date _________ Period ______
The Law of Induction
1.
In terms of electricity, what happens as you move a magnet toward a coil of wire?
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2.
When you move a magnet near a wire, it creates a potential difference, which
causes a current to flow if part of a complete circuit.
Will a nonmoving magnet cause induction? What must happen for electromagnetic
induction to occur?
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3.
A nonmoving magnet will not induce current. The magnet must be moving for
there to be a current induced.
What is Faraday’s law of induction?
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4.
The potential difference induced across the ends of a coil is directly related to the
speed with which a magnet is passed through a coil. It is also directly related to
the strength of the moving magnet and the number of turns in the coil.
How do you get the greatest induced current to flow in a coil?
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5.
Why does a spinning coil near a magnet produce alternating current rather than direct
current?
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6.
The greatest current will flow in a coil when the magnet moves the fastest near
the coil.
The direction of movement of the magnetic field determines the polarity of the
induced voltage. Since the direction of the moving field is continually reversing,
the polarity of the induced voltage changes.
What is a generator? What type of energy does it produce? How do power plants provide
electricity using induction?
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7.
A generator uses a turbine to induce current. It produces electrical energy from
mechanical energy. Power plants use resources such as coal, water, and nuclear
energy to turn a turbine and generate electricity.
Explain how each of the following would affect the current produced by a magnet
moving toward a coil of wire, as in the picture:
a. Using a stronger magnet
Higher Current
b. Moving the magnet toward the coil at a faster speed
Higher Current
c. Reversing the magnet’s motion so it moves away from the coil
Same current, flows in opposite direction
d. Adding more turns of wire to the coil
Higher Current
e. Moving the magnet’s south pole toward the coil
Current Flow in opposite Direction