Science Ch 8 Test Flashcards
This can be used to change the voltage of an alternating current
Transformer
Is the region where the magnetic field of a magnet is strongest
Magnetic pole
_______ does not change direction
Direct current
The properties and intersections of magnets are called
Magnetism
A ______ can rotate in a magnetic field when a current passes through it
Solenoid
The magnetic poles of atoms are aligned in a
Magnetic domain
A device that uses an electromagnet to measure electric current is a
Galvanometer
Where is the magnetic force exerted by a magnet strongest
Both poles
South Pole
North poles
Center
Both poles
Which change occurs in an electric motor
Electrical energy to mechanical energy
Thermal energy to wind energy
Electrical energy to mechanical energy
What happens to the magnetic force as the distance between 2 magnetic poles
Remains constant
Decreases
Increases
Decreases then increases
Increases
Which of the following best describes what type of magnetic poles the domains at the North Pole of a bar magnet have
North magnetic poles only
No magnetic poles
North and south magnetic poles
North and south magnetic poles
Which of the following would not change the strength of an electromagnetic
Increasing the amount of current
Changing the currents direction
Changing the currents direction
Which of the following would NOT be part of a generator
Turbine
Battery
Electromagnetic
Permanent magnet
Battery
Which of the following describes the direction of the electric current in AC
Is constant
Is direct
Changes regularly
Changes irregularly
Changes irregularly
The voltage in the secondary coil is the________ voltage
Output
