science exam 2

Question 1

The property of a material that prevents the flow of charged particles through it is ____

Answer 1

electrical resistance

Question 2

The flow of electric charge that transports energy from one place to another is

Answer 2

electric current

Question 3

true/false
Electrical resistance is measured in a unit called an ohm

Answer 3

true

Question 4

t/f
The length of a wire does not contribute to its resistance.

Answer 4

false

Question 5

t/f
The temperature of a wire does not contribute to its resistance.

Answer 5

false

Question 6

Two wires are made up of the same material and are the same length. One is twice as thick as the other. Which has less resistance?

Answer 6

thicker wire

Question 8

electricity

Answer 8

flow of electrons

Question 9

ampere

Answer 9

measurement of rate of electrical flow

Question 10

ion

Answer 10

atom with charge

Question 11

positively charged part of atom

Answer 11

proton

Question 12

t/f
Electrons do not flow in a wire when a difference in “electrical pressure” exists.

Answer 12

false

Question 13

potential energy/charge =

Answer 13

voltage

Question 14

t/f
unlike charges repel

Answer 14

false

Question 15

t/f
like charges attract

Answer 15

false

Question 16

negatively charged part of atom

Answer 16

electron

Question 17

t/f
The gravitational force of an object is stronger than its electrical force

Answer 17

f

Question 18

t/f
all electrons have same mass

Answer 18

t

Question 19

t/f
all electrons have same charge

Answer 19

t

Question 20

_________ states that electrical force between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Answer 20

coulombs law

Question 21

what makes up nucleus of atom

Answer 21

neutrons and protons

Question 22

The amount of current in a circuit is directly proportional to the voltage across the circuit and inversely proportional to the resistance of the circuit. This is __________

Answer 22

ohms law

Question 23

A circuit in which electrical devices are connected so that the same electric current exists in all of them is a _______

Answer 23

series circuit

Question 24

_______ is electrically charged particles that repeatedly reverse direction, vibrating in relatively fixed positions in a circuit.

Answer 24

alternating current

Question 25

in a _____, electrical devices are connected so that the same voltage acts across each one and any single one completes the circuit independently of all the others.

Answer 25

parallel circuit

Question 26

in ______,electrically charged particles flow in one direction only.

Answer 26

direct current

Question 27

The rate of energy transfer or rate of doing electric work

Answer 27

electric power

Question 28

current =

Answer 28

voltage/resistance

Question 29

At 200 ohms, how much current will flow through an object if it touches the terminals of a 12-V battery?

Answer 29

0.06 A

Question 30

for there to be flow of electrons, there must be difference in ____

Answer 30

voltage

Question 31

electrical pressure is another way to say ____

Answer 31

voltage

Question 32

amps * volts =

Answer 32

watts