If a step-up transformer has a primary coil with 15 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts?
A. 8 turns
B. 30 turns
C. 80 turns
D. 160 turns Weegy:
The answer is B. 30 turns Auto answered|Score 1|bongche|Points 3864|User:
If the current in a wire is directed upward, what is the direction of the magnetic field produced by the current?
A. counterclockwise in the horizontal plane
B. clockwise in the horizontal plane
C. in the same direction as the current
D. in the opposite direction to the current Weegy:
If the current in a wire is directed upward,the direction of the magnetic field produced by the current is counterclockwise in the horizontal plane.Auto answered|Score 1|emdjay23|Points 2294|User:
In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because
A. the electromagnet loses its magnetism.
B. mechanical energy is converted to electric energy.
C. the moving electrons push the electromagnet in the opposite direction.
D. the magnetic field reverses direction.Weegy:
In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because: D. the magnetic field reverses direction.
]Auto answered|Score .8961|alfred123|Points 3645|User:
The electromagnet in a galvanometer
A. increases the voltage in a circuit.
B. moves a pointer along a numbered scale in response to a current.
C. induces an electric current.
D. increases the current in a circuit.Weegy:
The electromagnet in a galvanometer A. increases the voltage in a circuit. B. moves a pointer along a numbered scale in response to a current. [ www.weegy.com/?ConversationId=BBFD8A5B
] Auto answered|Score .8065User:
Moving a magnet inside a coil of wire will induce a voltage in the coil. How can the voltage in the coil be increased?
A. Move the magnet inside the coil of wire more slowly.
B. Hold the magnet stationary.
C. Move the coil of wire slowly, and keep the magnet stationary.
D. Move the magnet inside the coil of wire more rapidly.Weegy:
The answer is D. The voltage in the coil be increased by moving the magnet inside the coil of wire more rapidly.Auto answered|Score .7333|matahari|Points 2449|User:
A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, what is the input voltage?
A. 8 volts
B. 150 volts
C. 640 volts
D. 600 volts Weegy:
The answer is C. 640 volts Auto answered|Score 1|bongche|Points 3864|User:
A DC generator is similar to an AC generator except that in
A. DC generators, slip rings produce direct current.
B. DC generators, commutators produce direct current.
C. AC generators, commutators produce alternating current.
D. AC generators, no commutators or slip rings are used.Weegy:
The answer is B. DC generators, commutators produce direct current. Auto answered|Score .76|bongche|Points 3864|User:
The output voltage and current of a transformer are determined by the
A. number of turns in the primary and secondary coils.
B. strength of the DC current in the primary coil.
C. ferromagnetic material of the rings connecting the coils.
D. direction of the current in the primary coil.Weegy:
The output voltage and current of a transformer are determined by the 1. number of turns in the primary and secondary coils.Auto answered|Score .8924|vchutkan|Points 5854|User:
A region that has a large number of atoms whose magnetic fields are lined up parallel to a magnet’s field is
A. the magnetosphere.
B. the magnetic declination.
C. a magnetic domain.
D. a ferromagnetic region. Weegy:
C. A magnetic domain.Auto answered|Score 1|Fanboy|Points 2821|User:
Before electric current in power lines can be safe for your home, it must pass through a
B. step-down transformer.
C. step-up transformer.
2. step-down transformer. Auto answered|Score .9786|stickman|Points 6262|User:
What is the name of the area surrounding Earth that is influenced by Earth’s magnetic field?
C. magnetic domain
D. magnetic declination Weegy:
What is the name of the area surrounding Earth that is influenced by Earth?s magnetic field? B. atmosphereAuto answered|Score 1|colossus09|Points 112|
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