Chapter 16 Test Flashcards
Who suggested the earth was a big magnet?
William Gilbert
Three properties of magnets
Has 2 poles, exert forces on each other, surrounded by magnetic field
As electrons move, what do they create?
Electric current and charges
Electric current is made when something happens to a magnetic field. What happens?
Change happens
Explain why rotating either the coil or the magnet induces an electric current
It changes the magnetic field
List 3 things that can happen to a magnet that will de magnetize
Dropping it, heating it, or putting it by an opposite force too strong
What are the two main types that we discussed?
Electromagnetic & Ferromagnetic
Temporary & perminate
What are two effects of the earth’s magnetic field?
Auroras
North and south poles
What can you make visible by sprinkling iron filings around a magnet?
A magnetic field
What did Faraday’s experiments with magnets and electromagnetic induction demonstrate?
Electric current is made when magnetic fields change
What do we call a coil of wire with an electric current?
A solenoid
What do we call a device that increases the voltage of an alternating current?
A step up transformer
What do we call electric current changing directions?
Alternating current
what do you end up with if you cut a magnet in half?
Two smaller magnets that have both polls.
What does a step down transformer do the voltage and current?
It decreases the voltage
