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Transcript
Topic 6 Assignment Vocabulary: Electric Generator- a device that converts mechanical energy to electrical energy Electromagnet-A soft metal core made into a magnet by the passage of electric current through a coil surrounding it Alternating Current-An electric current that reverses its direction many times a second at regular intervals, typically used in power supplies Direct Current-An electric current flowing in one direction only Split Ring Commutator-a device found in a motor that reverses the direction of electrical current every half-turn of the armature Motor-A device that converts any form of energy into mechanical energy Armature-The rotating coil or coils of a dynamo or electric motor Assignment: 1. Who first observed the connection between magnetism and electricity? What did this person observe that led to the discovery? Michael Faraday, he held a coil of wire over a metal needle 2. Describe at least two ways to make an electromagnet stronger. Increase Current, change core 3. What is the difference between AC and DC? How is each type of current produced? Why do we use AC in our homes? AC-Alternating Current DC-Direct Current AC is easier and more efficient to transmit over long distances 4. Complete the table DIFFERENCES GENERATOR MOTOR Produces Electricity MotionCurrent Uses Electricity CurrentMotion SIMILARITIES Both Involve electricity 5. Examine the electric motor shown here in schematic form and identify the labeled parts. Hints are given to assist you. On the next page… Use the following words to answer the questions below… brush electromagnet south insulating gap armature negative split ring commutator direct current (DC) permanent magnet magnetic pole (a) spinning part- Armature (b) wire coil is an- ElectroMagnit (c) not temporary- Permanent Magnet (d) alternates flow- Split Ring Commutator (e) non-conductor- Insulating Gap (f) paints on charge- Paints on the charge (g) current type Direct Current (h) terminal charge- negatie (i) the end- Magnetic Pole (j) if “i” is a north- South 6. If item “g” on the device above were to be replaced with an electrical load, and part “a” was turned by hand, this would then be an Generator