Electricity & Magnetism

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created 10 years ago by iloveeyhubabee98
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Grade levels:
8th grade
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science
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1

the buildup of electric charges on an object is called a _________ charge

static

2

two objects will attract one another when they have ___________ charges

opposite

3

one example of a good conductor is _______

copper

4

the steady flow of electrons through a conductor is an electric _____________

current

5

when the resistance in an electrical circuit increases, the current flowing in the circuit _________

decreases

6

resistance is measured in a unit called the ____

ohms

7

a path created for a current that allows only one route for the current is called a __________ current

series

8

a _________ breaker is a device designed to open an overload circuit and prevent overheating

circuit

9

electric companies usually sell electrical energy in units of ____

kWh

10

a circuit that has more than two or more separate paths for electrons to follow is a(n) ___________ circuit

parallel

11

the south pole of a magnet attracts the ______ pole of another magnet

north

12

when you break an iron magnet into two pieces, you get two ____________

magnets

13

the region around a magnet where the magnetic forces act is the ________________

magnetic field

14

the magnetic field of a magnet is strongest at the ________

poles

15

an electromagnet is only operating when the current is ___

on

16

the function of an electric motor is to change ____________ energy to _____________ energy

electrical; mechanical

17

a current carrying wire wrapped around an iron ore is called a(n) _______________

electromagnet

18

current that does NOT reverse direction is called _______________________

direct current

19

a simple complete circuit must have wires connected to a __________ and an ___________________

load; energy source

20

when you walk across a carpeted floor and then touch a metal doorknob, the "shock" you may feel occurs because of a(n) static _____________

discharge

21

when you rub a balloon on your hair, __________ go from your hair to the balloon

electrons

22

in a battery, electrons flow from the _________ terminal to the ___________ terminal

negative; positive

23

a wire that is long and _________ would have the greatest electrical resistance

thin

24

two identical balloons are both rubbed with wool. If the balloons are brought near each other, they will ________ each other

repel

25

the core of an electromagnet is usually made of ______

iron

26

a magnetic field exists around a wire whenever a ________ flows through the wire

current

27

earth's magnetic field is called the _________________

magnetosphere

28

List and describe the three essential parts of a circuit

1) wires- conducts current
2) energy source- supplies charge
3) load- uses electrical energy

29

describe how direct current differs from alternating current

direct currents- only travels in one direction
alternating currents- switches directions

30

how does lightning form?

1) charges build up in clouds
2) cloud charges are attracted to opposite charges on the ground
3) when imbalance of charges become too great, you get a discharge = lightning