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Why is electricity transmitted in high voltages from the power stations?
To overcome the high resistance of the wires
To ensure that every household gets the electricity
To reduce power loss
To increase efficiency
Choose all of the generators
Choose all of the motors.
How does a motor work?
Current generates an electric field around the loop of wire. The electric force causes the loop of wire to rotate.
Current generates a magnetic field in the loop of wire that is then attracted and repelled by the magnet(s) in the motor.
The magnets in the motor attract and repel the metal in the copper wire that makes up the loop. This causes the loop to rotate.
Generators are devices that convert _____ energy into _____ energy.
What did Faraday discover about Induction?
That a changing magnetic field induces a current in a conductor.
That electricity and magnetism were related when he noticed a current carrying conductor deflected the compass of a needle.
That the Earth's magnetosphere deflected charged particles from the sun known as solar winds.
That alternating current could be manipulated with transformers.
If you brought an unknown pole of a magnet near a South magnetic pole and they attract.
what is the unknown pole?
not enough information
A __________ is an electrical device that converts AC electricity from one voltage level to another
Which of the following is a device that converts electrical energy into kinetic energy?
What direction is the force/motion in the following diagram?
Perpendicular to the magnets
Parallel and through the magnets
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Strength of magnetic field
Size of the current
Length of the conductor
When does the Output Voltage becomes -5?
When the coil has rotated 90 degrees
When the coil has rotated 180 degrees
When the coil has rotated 270 degrees
When the coil has rotated 135 degrees
Which of the following increases frequency of AC?
increasing number of turns on the coil
using a stronger magnet
rotating the coil faster
increase area of the coil