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16 Cards in this Set

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  • Back
  • 3rd side (hint)
An area of a magnet where the magnetic force appears to be the strongest.
What is a Magnetic Pole? (464)
Like poles repel each other while opposites attract. No matter how small the piece of magnet may be, it will always have a North & South Pole.
A region where a magnetic force can be detected.
What is a Magnetic Field? (465)
This will vary with strenth of magnet, as distance between magnets increase the force of magnetism decreases.
The first naturally occurring magnetic rocks.
What are Lodestones? (463)
These rocks came from Magnesia, Greece and were discovered 3000 yrs. ago.
A Lodestone is a _______ __________ because it is magnetic all the time.
What is a Permanent Magnet? (463)
Magnetite is the only type of ________ ______________ known to man.
Scientists classify materials as either
______ or ______ depending on how easily they are magnetized and how long they hold the property.
What is Magnetically Hard or Soft?
Iron can be made magnetic by rubbing it repeatedly with a magnet in the same direction.
A long, wound coil of insulated wire.
What is a Solenoid? (469)
Christian Oersted first experimented with an early form of this device which creates stronger magnetic fields.
A strong, magnet created when an iron core is inserted into the center of a current-carrying solenoid.
What is an Electromagnet? (470)
Makes a stronger magnet than a solenoid alone with addition of an iron core & wounds of insulated wire.
A microscopic magnetic region composed of a group of atoms whose magnetic fields are aligned in a common direction.
What is a Domain? (471)
When exposed to a magnet by rubbing in the same direction, a piece of iron becomes a magnet by the alignment of these ____________.
A device that converts electrical energy to mechanical energy.
What is an Electric Motor? (472)
This device uses a commutator and brushes to make current change direction producing a magnetic field in a coil that interacts with the magnetic field of the surrounding magnet causing the coil to turn.
The production of a current in a conducting circuit by a change in the strength, position, or orientation of an external magnetic field.
What is Electromagnetic Induction? (474)
In 1831, Michael Faraday discovered that a current can be produced by pushing a magnet in and out of a coil of wire. He called this process _______ __________.
An electric current can be produced in a circuit by a changing magnetic field.
What is Faraday's Law? (474)
Appears to produce energy from nothing but in reality supports the law of conservation of energy.
A device that uses electromagnetic induction to convert mechanical energy to electrical energy.
What is a Generator? (476)
A device that produces the electrical energy you use at home.
An electric current that changes direction at regular intervals; also called AC.
What is Alternating Current? (476)
A coil rotating in the magnetic field of a magnet creates this current that you use in the home.
A device that can change one alternating-current in the primary circuit to induce an alternating current in the secondary circuit.
What is a Transformer? (473)
Determines amount of voltage induced in the secondary coil by the number of loops or turns of wire in the coil. It can be increased or decreased by adding/removing coils.
A device that produces 50% greater voltage across the secondary coil than the voltage across the primary coil.
What is a Step-Up Transformer? (480)
Device used at or near a power plant to increase voltage of current to about 120,000 V which reduces energy loss due to resistance of transmission wires.
A device with a secondary coil having fewer loops than the primary coil, lowering the voltage created.
What is a Step-Down Transformer? (480)
Device found on electric lines near a house or business which reduces the amount of voltage of current to about 120V for surge protection and safety reasons.