Download MS PS CC RWA Answer Key - Lucky Discovery 1. During

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MS PS
RWA Answer Key
Lucky Discovery
MS PS CC RWA Answer Key - Lucky Discovery
1. During a lecture in 1820, Oersted carried out an experiment that had
never been performed before. He placed a compass with a magnetized
needle underneath a wire. Then he turned on electric current through the
wire and observed that the needle of the compass moved. Oersted
realized from this experiment that electricity and magnetism are
connected.
2. The demonstration in the video shows what Oersted observed in his
experiment. In the demonstration, a wire is placed above a magnetized
needle. When both ends of the wire are connected to a battery so current
flows through the wire, the magnetized needle moves.
3. Following his demonstration of a connection between electricity and
magnetism, many other scientists began investigating electromagnetism.
This research led to important new theories and discoveries.
4. Because they are controlled by electric current, which can be varied,
electromagnets can be made to vary in the strength and direction of their
magnetic force. They can also be made very strong and easily turned off
or on. In addition, they can be used to create continual motion when
opposed by other magnets.
5. Answers may vary. Sample answer: Loudspeakers make use of the ability
of electromagnets to vary in magnetic force. Junkyard magnets make use
of the ability of electromagnets to be very strong and easily turned off or
on. Maglev trains make use of the ability of electromagnets to create
continual motion.
6. Answers may vary. Sample answer: I think my life would be very different
without Oersted’s discovery because many modern devices use
electromagnets. For example, without electromagnets, there would be no
electric motors, and electric motors are found in devices such as electric
fans, hair dryers, computers, and microwave ovens.
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