Magnetism Flashcards
1
Q
Describe permanent magnet
A
Produces its own magnetic field
2
Q
Describe induced magnet
A
Only have magnetic field temporarily
3
Q
Ways to increase electromagnet strength
A
Increase current
Decrease length of coil
Increase number of coils
Add iron core inside solenoid
= becomes induced magnet
4
Q
Role of transformer
A
Increase or decrease voltage of electricity
5
Q
How does a transformer work
A
- alternating pd causes current to flow
- cause current to flow in alternating pattern
- magnetic field around coil also alternating
- induces alternating magnetic field in iron core
- core induces pd around secondary coil
6
Q
Why are there so many steps in transformer
A
Change size of pd between the two coils
