Which term describes an apparent change in frequency of sound waves of rapidly moving objects
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Definition1/3
Doppler effect
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Term1/3
How do the vibrations of an audio speaker produce sound waves
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Definition1/3
The vibrations of an audio speaker produce sound waves by
compressions and rarefactions in air particles.
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Term1/3
The wiring in most homes consists of three wires Two wires make up an electric circuit What is the purpose of the third wire
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Definition1/3
A three wire 120/240 volt system is created by centre tapping a
240 volt coil. The two lines of the 240 volt secondary coil of a
distribution transformer are designated L1 and L2. The centre tap
of the 240 volt coil is designated N which stands for neutral. The
neutral centre tap is grounded to zero potential earth. As the 240
volt coil is centre tapped it splits the coil into two equal
halves. This creates a condition, by having the two coils in series
with each other that the total 240 volts is also split into two
dropping 120 volts across each coil. From L1 to N is equal to 120
volts. From L2 to N is equal to 120 volts. From L1 to L2 is equal
to 240 volts. In North America this is the voltages that are used
in home wiring. By centre tapping this secondary transformer coil
it allows appliances of both 120 and 240 volts to be used
simultaneously to operate in the home. Larger wattage demand loads
are connected to the 240 volt connections while smaller appliance
wattages are connected to either of the two 120 volt
connections.
As you state only two wires completes a circuit but by this type
of connection twice the amount of circuits can be obtained at the
120 volt level. On a distribution panel of 40 circuits you can have
40 - 120 volt circuits or 20 - 240 volt circuits or any combination
of the two depending on the specifications of the equipment to be
connected.
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Cards in this guide (3)
Which term describes an apparent change in frequency of sound waves of rapidly moving objects
Doppler effect
How do the vibrations of an audio speaker produce sound waves
The vibrations of an audio speaker produce sound waves by
compressions and rarefactions in air particles.
The wiring in most homes consists of three wires Two wires make up an electric circuit What is the purpose of the third wire
A three wire 120/240 volt system is created by centre tapping a
240 volt coil. The two lines of the 240 volt secondary coil of a
distribution transformer are designated L1 and L2. The centre tap
of the 240 volt coil is designated N which stands for neutral. The
neutral centre tap is grounded to zero potential earth. As the 240
volt coil is centre tapped it splits the coil into two equal
halves. This creates a condition, by having the two coils in series
with each other that the total 240 volts is also split into two
dropping 120 volts across each coil. From L1 to N is equal to 120
volts. From L2 to N is equal to 120 volts. From L1 to L2 is equal
to 240 volts. In North America this is the voltages that are used
in home wiring. By centre tapping this secondary transformer coil
it allows appliances of both 120 and 240 volts to be used
simultaneously to operate in the home. Larger wattage demand loads
are connected to the 240 volt connections while smaller appliance
wattages are connected to either of the two 120 volt
connections.
As you state only two wires completes a circuit but by this type
of connection twice the amount of circuits can be obtained at the
120 volt level. On a distribution panel of 40 circuits you can have
40 - 120 volt circuits or 20 - 240 volt circuits or any combination
of the two depending on the specifications of the equipment to be
connected.