Magnetism

Question 1

What direction does a compass point to

Answer 1

Magnetic south

Question 2

Why can’t the power company make a solenoid with millions of coils

Answer 2

It becomes harder and harder to move the solenoids and it takes a greater force

Question 3

Motor or generator?
Loud speaker
Microphone
Toy car

Answer 3

Motor
Generator
Motor

Question 4

Why does the power company transmit power at a high voltage

Answer 4

Because there is a lower current which means there is less energy lost to heat= save money

Question 5

Name 3 motors

Answer 5

Toy car
Loud speaker 
Microwave 
Clock
Fan
Blender pencil sharpener

Question 6

How does a simple motor work

Answer 6

There is a wire and a magnet and a current going through the wire which creates a B field around the wire. The magnet is near the wire. Magnet exerts a force on the wire, spinning it. Forces opposes and attract each other creating an alternating current.

Question 7

How does a generator work

3 examples

Answer 7

Microphone, hydro electric dam, magnetic credit card.
Need a coil of wire, magnet, and source of motion.
Move magnet/ wire which creates a change in the magnetic field and that creates a currents.

Question 8

Transformer

Answer 8

Transformer uses alternating current
Because the current goes back and forth it changes the B field.
WHEN THE CURRENT IN THE PRIMARY CIRCUIT CHANGES DIRECTIONS IT INDUCES THE CURRENT IN THE SECONDARY CIRUIT. THE AMOUNT OF POWER STAYS THE SAME

Question 9

Ways to increase current

Answer 9

Number of coils
Strength of magnet
Distance between two
Speed at chich you move the magnet

Question 10

MAKE MOTOR SPIN FASTER BY

Answer 10

of coils
Two things closer together
Stronger magnet
More current

Question 11

Why does dropping a magnet affect magnetism

Answer 11

When dropped the domains become misaligned so it becomes unmagnitized