The energy associated with electric currents is called mechanical energy
What is false
100
the relationship between electricity and magnetism is called
What is electromagnetism
100
a generator uses motion of wire in a magnetic field to produce
What is electric current
100
in a transformer, this is connected to the power source
What is primary coil
100
this provides a field that causes the wire loop (with a current) in a motor to rotate
What is magnet
200
the type of current produced by a battery is direct current
What is true
200
this device uses the magnetic force on a wire loop in a magnetic field to measure current
What is a galvanometer
200
a turbine turns this part of a generator
What is armature
200
this type of current cannot be stepped up or stepped down
What is direct current
200
this is the device that causes current to be reversed in the wire coils
What is commutator
300
in a transformer, the primary coil is connected to a power source
What is true
300
A coil of wire with a current passing through it is called
What is a solenoid
300
a generator turns this type of energy into electrical energy
What is mechanical
300
What can alternating current produce that direct current cannot that allows a transformer to work?
What is a moving magnetic field
300
these are the contact points that supply power to the motor
What are brushes
400
an electric current will be induced in a conductor when it is moved in a magnetic field
What is true
400
a solenoid produces this type of field
What is magnetic
400
power generator with a slip ring produces this type of current
What is AC or alternating current
400
this is the frequency of the power in our transmission lines
What is 60 Hz or 60 times/sec
400
In a real motor, this device consists of hundreds of loops of wire around the magnetic core
What is armature
500
a current is passed through a wire from right to left on this screen. The magnetic field goes into the screen below the wire and comes out of the screen above the wire
True
500
name two ways to increase the strength of an electromagnet
What are increase number of loops, move loops closer together, increase current, increase strength of ferromagnetic core
500
This device is attached to the ends of the armature and transfers current to the brushes
What is a slip ring
500
Transmission lines transport this type of current___________ at this voltage ___________
What is AC, 400,000kW
500
This part of the motor turns and is connected to the armature