Transcript Electric Phenomena

5.6 (B) demonstrate that the
flow of electricity in circuits
requires a complete path
through which an electric
current can pass and can
produce light, heat, and sound
Vocabulary
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A circuit is a closed path through which electricity
travels.
The flow of electric charges through a circuit is an
electric current.
Material that allows energy to travel through it easily
or quickly is a conductor.
An electromagnet is made by passing an electric
current through a wire that is wrapped around a
metal object.
Electrical Energy
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Electricity can be converted (or transformed)
into other forms of energy. For example:
heat, light, sound and magnetic force.
A circuits have an energy source, something
that uses energy, wires for the energy to flow
through and a switch to interrupt the flow of
energy.
Heat and Light
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An electric current travels along a wire from a
battery, through a switch to a bulb or other
device that uses the energy, and finally back
to the battery. If a bulb is left out of the loop
or circuit, it will not receive the energy from
the battery and will therefore, not light up.
Sound
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Electrical energy can be transformed into
sound energy.
A speaker is the device that uses the energy
to vibrate.
Vibrations create sound waves which your
brain interprets as sound.
Electromagnet
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A speaker and motors work by using an
electromagnet.
It is made of wire coiled around an iron core
like an iron nail. The wire is connected to a
battery or other energy source.
The current flows through the wire. This
charges the iron nail making it magnetic.
The electromagnet only works when the
circuit is complete.
Sample Questions
Which simple circuit is complete?
A.
B.
C.
D.
Correct Answer Choice:
C.
The circuit is made from the bulb threads to the
negative charge then through the battery to the
positive charge and back to the bulb base.
Incorrect Answer Choices:
A.
The wire is not connected to the negative
charge.
B.
The wire is not connected to the thread of the
bulbs.
D.
The wire is not connected to the negative
charge.
A student made this electrical circuit.
However, the light bulb does not light up.
What should the student do first
to try to make the circuit work?
A. Replace the bulb.
B. Close the switch.
C. Charge the battery.
D. Open the switch.
Correct Answer Choice:
B. Close the switch.
Closing the switch will complete the circuit.
Incorrect Answer Choices:
A. Replace the bulb
is incorrect because the student cannot check
to see if the bulb is burned out unless they
close the circuit to test it.
C. Charge the battery
is incorrect because the student cannot check to
see if the battery is charged unless they close the
circuit to test it.
D. Open the switch
is incorrect because the switch is already
open.
Which circuit will make a sound?
A.
B.
C.
D.
Correct Answer Choice:
D.
The circuit is complete.
Incorrect Answer Choices:
A.
B.
C.
The wire only connects the negative
charge to the bell.
The circuit is open.
The bell is not connected to the
positive charge.
Which of the following
is NOT a conductor of
electricity?
A. Rubber
B. Copper
C. Silver
D. Iron
Correct Answer Choice:
A. Rubber
Energy does not travel easily or quickly through
the material.
Incorrect Answer Choices:
B. Copper
is incorrect because energy does travel easily
or quickly through the material.
C. Silver
is incorrect because energy does travel easily
or quickly through the material.
D. Iron
is incorrect because energy does travel easily
or quickly through the material.
Which of the following variables
will NOT create a stronger
electromagnetic pull?
A. Increase the number of coils.
B. Use higher voltage battery.
C. Use a copper wire.
D. Use an aluminum wire.
Correct Answer Choice:
D. Use an aluminum wire.
Aluminum is not a good conductor of electricity.
Incorrect Answer Choices:
A. Increase the number of coils
is incorrect because the number of coils
around the iron nail will increase the magnetic
pull.
B. Use higher voltage battery
is incorrect because the higher the volts a
battery has, the stronger the magnetic pull.
C. Use a copper wire
is incorrect because copper is a good
conductor of electricity.
Illustration Sources
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Electromagnet
http://www.sciencetech.technomuses.ca/
english/schoolzone/activities_scie1.cfm
Bell
http://office.microsoft.com/clipart
Background
http://office.microsoft.com/clipart