# electricity and magnetism

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Vocab and other things to know for freshman year honors physical science... electricity and magnetism

### magnetic fields

a force field that fills the space around every magnet or current-carrying wire... another magnet or current-carrying wire that enters will experience a magnetic field

### magnetic domains

a microscopic cluster of atoms with their magnetic fields aligned

### christian oersted

discovered that moving charges in an electric current produces a magnetic field in a circular pattern

### oersted's discovery

more current=more magnetic field

### right thumb rule

direction of current determines the direction of the magnetic field

### electromagnet

TEMPORARY magnet with a field produced by an electric current; usually in the form of a wire coiled around a piece of iron

### property of electromagnets

increase current, you increase magnetic field

### property of electromagnets

add more turns, increase magnetic field

### property of electromagnets

have a north and a south pole

### property of electromagnets

when placed in a magnetic field, it will align itself along the magnetic field lines (like a compass)

### property of electromagnets

will attract magnetic materials and be attracted and repelled by other magnets

### galvanometer

a device that uses an electromagnet to measure electric current

### electric motor

a device that changes electrical energy into mechanical energy

### electric motor

contains an electromagnet which rotates freely to the poles of the permanent magnet, permanent magnet, coil, and electric current (battery)

### generator

a machine that produces electric current by rotating a coil within a stationary magnetic field

### transformer

a device for increasing or decreasing voltage through electromagnetic induction

### related

magnetism and electricity are ___

### motion of electric charges

magnetism is produced by the ___ _ ___ ___

### motion of a magnet

faraday and henry discovered that electric current can be produced by ___ _ _ ___

### magnetic field in a the loop

voltage is induced in a loop of wire if there is a change in the ___ ___ _ _ ___

### electromagnetic induction

the phenomenon that electric current can be produced by the motion of a magnet and the voltage is induced if there is a change in the magnetic field is known as ___ ___.

___ & ___ discovered that electric current can be produced by the motion of a magnet

### doubles

when a magnet is plunged in and out of a coil of wire, voltage is induced in the coil. If the rate of the in-and-out motion of the magnet is doubled, the induced voltage ___

### doubles

if the number of loops in the coil is doubled, the induced voltage ___

### electric field

a rapidly changing magnetic field in any region of space induces a rapidly changing __ ___

### magnetic field

a rapidly changing electric field induces a rapidly changing ___ ___

### electromagnetic waves

the generation of electric and magnetic fields makes up ___ ___

### iron, nickel, cobalt

magnetic elements

### solenoid

a current-carrying wire that acts like a magnet when the current passes through it

### commutator

a device for reversing the direction of a current

### increases strength

more loops and a higher current through a solenoid

### parts of an electromagnet

wire, power source, and iron core

### step-up

used from generator to power lines

### step-down

used from power lines to buildings

### AC

current changes direction every 1/2 turn in an electromagnet generator

### DC

1 complete circuit, 1 direction

Example: