Static Electricity
What is electric charge?
a property of matter that can be positive, negative, or neutral
What is electric current?
the flow of negative charges
What is a permanent magnet?
something that always makes its own magnetic field
What does electric current produce?
a magnetic field
negative charges
circuit
Where on a magnet is the magnetic field the strongest?
at the poles
What is an electromagnet?
something that produces a magnetic field only when electric current passes through it
In what two types of charge transfer do charges move by direct contact?
What is a closed circuit?
complete loop for current to travel
Copy these and fill in the blanks:
Opposite poles _____
Same poles ____
Opposite poles attract
Same poles repel
An electric motor transforms ____ energy into ____
electrical energy into KE
In what type of charge transfer do charges move without direct contact?
induction
What is an open circuit?
incomplete loop for current to travel
What is one thing that affects the strength of a magnetic field?
- how close you are to the magnet (closer = stronger)
- how large the magnet is (mass, size)
- what the magnet is made of (composition)
An electric generator transforms ___ into ___
KE into electrical energy
When will charges stop being transferred in a system?
What is the difference between an electrical conductor and an electrical insulator?
conductor = energy passes quickly
insulator = energy passes slowly
A bar magnet has two poles. If you break it in half to make two smaller bar magnets, how many poles will each magnet have?
What is one way to make an electromagnet stronger?
- use a larger iron core (nail)
- use more wire turns
- use thicker wire
- use more or bigger batteries