test

Question 1

field

Answer 1

a region of empty space around an object that is being influenced by a force emitted from that object

Question 2

electric field

Answer 2

caused by charging objects
ex. if you hold up a charged balloon next to your hair, it will stand up on end

Question 3

magnetic field

Answer 3

can exert force on other magnets of electric fields that enter the space around the magnet

Question 4

the earths magnetic field is thought to come from:

Answer 4

electric currents originating deep within the planet

Question 5

gravitational field

Answer 5

a mass experiencese a force

Question 6

electric

Answer 6

either positive or negative charged

test bodies:
small charges objects

ex. power lines

Question 7

magnetic

Answer 7

either magnets or electric currents

test bodies:
small magnets such as compass needles

ex.
fridge magnet
earths poles

Question 8

gravitational

Answer 8

have mass

text bodies:
small objects with mass

ex.
earth
moon
sun

Question 9

motors

Answer 9

convert electrical to mechanical energy

Ee -> Em

Question 10

generator

Answer 10

convert mechanical to electrical energy
aka kinetic or motion (Ek)

Em -> Ee

Question 11

electrical energy

Answer 11

the energy made available by the movement of change

Ee

Question 12

mechanical energy

Answer 12

the energy of motion, or the energy of an object that moves

Em

Question 13

armature

Answer 13

-made up of a coil of wire
-the part of the motor that actually spins

Question 14

commutator

Answer 14

-allows the electricity from an outside force to flow into the armature
-two types, split ring and slip ring

Question 15

brushes

Answer 15

-connected to the electricity source
-in contact with the commutator

Question 16

shaft

Answer 16

-everything is attached along the shaft, which spins

Question 17

magnet

Answer 17

-there needs to be an outside magnetic field to interact with the magnetic field of the wires

Question 18

series connections

Answer 18

-components are arranged one after another
-the electric current has only one path to follow

Question 19

advantages of series connections

Answer 19

-allow for greater power source

Question 20

disadvantages of series connections

Answer 20

-if one component malfunctions, every component will fail to work

Question 21

parallel connections

Answer 21

-components are arranged parallel to each other

Question 22

advantages of parallel connections

Answer 22

-won’t draw as much power (e.g. batteries will last longer)
-if one component fails the rest of the circuit will continue to funcrion

Question 23

disadvantages of parallel connections

Answer 23

-voltage is more limited
-if you want to shut down the circuit, you have to shut off each component individually

Question 24

wavelength

Answer 24

-refers to the distance required for 1 complete cycle (crest + trough)
-can also be the distance between a point on the wave and the same point on the next wave

Question 25

frequency

Answer 25

the number of waves that pass through at a given point

Question 26

reflection

Answer 26

-when light hits a surface or boundary, it can bounce off and return back the way it came at the same angle ex. seeing your image in a still pond

Question 27

refraction

Answer 27

-as light travels from one medium to another, it can bend and change direction ex. objects half submerged in water

Question 28

diffraction

Answer 28

light can bend around an obstacle or bend through an opening ex. spread if colors in a rainbow

Question 29

polarization

Answer 29

-waves only vibrate in one direction

Question 30

transformers transform the voltage from:

Answer 30

one circuit to a different value for a second circuit

Question 31

step-down transformer

Answer 31

-found in some power poles -decreases the voltage

Question 32

step-up transformer