Electricity and Circuits

Question 1

An electric field is a force field caused by?

Answer 1

Charges

Question 2

Electric force and gravitational force are alike in that both forces

Answer 2

are field forces

Question 3

Objects become electrically charged as a result of the transfer of

Answer 3

electrons

Question 4

Which type of force is responsible for holding electrons in orbit around the nucleus of an atom?

Answer 4

electromagnetic force

Question 5

If two objects are electrically repelled from each other and one is negative what could the other object be?

Answer 5

negative

Question 6

If two objects are electrically repelled from each other and one is positive what could the other object be?

Answer 6

positive

Question 7

The term used to describe electrical pressure is __________.

Answer 7

voltage

Question 8

When there is an electric current passing through a wire, the particles moving are _________.

Answer 8

electrons

Question 9

A voltage will influence current only if the circuit is __________.

Answer 9

closed

Question 10

current

Answer 10

amperes

Question 11

voltage

Answer 11

volts

Question 12

resistance

Answer 12

ohms

Question 13

charge

Answer 13

coloumbs

Question 14

Substances whose atoms have more free electrons are called ________.

Answer 14

conductors

Question 15

_________ are materials that do not allow electricity to pass through them so easily.

Answer 15

insulators

Question 16

Electric current in a wire is the

Answer 16

rate at which electric charges move through a wire.

Question 17

A voltage will influence current only if the circuit is __________.

Answer 17

closed

Question 18

In order for there to be a flow of charge from one place to another, there must be a

Answer 18

complete conducting path connecting two terminals

Question 19

What is Ohm’s Law?

Answer 19

V=IR

Question 20

voltage is the

Answer 20

potential difference between two points in a circuit.

Question 21

Power outlets in our homes generally have a potential difference of

Answer 21

120 V

Question 22

squiggly line

Answer 22

AC

Question 23

dotted/straight line

Answer 23

DC

Question 24

A Battery makes this type of current.

Answer 24

DC

Question 25

A generator makes this type of current.

Answer 25

AC

Question 26

AC flows

Answer 26

back and forth

Question 27

DC flows

Answer 27

in one direction

Question 28

Electrical resistance in a wire depends on the wire’s

Answer 28

all of these (temp, length, thickness)

Question 29

________ is the rate at which energy is transferred from one from to another.

Answer 29

power

Question 30

Which statement is correct regarding electric power.

Answer 30

Electric power = current x potential difference

Question 31

The mechanism of a complete circuit that converts electrical energy to other forms of energy is

Answer 31

electrical load

Question 32

If the voltage impressed across a circuit is constant but the resistance doubles, what change occurs in the circuit?

Answer 32

Current is reduced by half.

Question 33

Electrical resistance is measured in

Answer 33

ohms

Question 34

Is electrical resistance greater in a short thick wire or a long thin wire?

Answer 34

long thin

Question 35

Which of the following is a unit of power?

Answer 35

joule per second

Question 36

A circuit breaker is designed to limit the amount of ____________ in a circuit.

Answer 36

current

Question 37

Three lamps are arranged as shown above. Which single lamp must burn out to cause all of the lamps to go out?

Answer 37

lamp 2

Question 38

What arrangement would make the brightest light?

Answer 38

2 bulbs connected in parallel with 2 batteries

Question 39

What happens when one light goes out or is removed in a series circuit?

Answer 39

All the lights go out

Question 40

Which type of circuit is characterized by the fact that there are multiple pathways by which charge can travel?

Answer 40

parallel

Question 41

What happens when one light goes out or is removed in a parallel circuit?

Answer 41

Only that light goes out

Question 42

Several resistors are wired in a circuit so that there is a single path for the flow of electric current. What type of circuit is this?

Answer 42

series

Question 43

A short circuit is

Answer 43

potentially hazardous, a circuit without a load that presents little resistance to electron flow

Question 44

Which of the schematics shown above conducts electricity through the lamp?

Answer 44

A and C

Question 45

What can you say about the voltages in a parallel circuit?

Answer 45

It is the same across each branch as the supply voltage

Question 46

Because household devices are connected in parallel in a circuit, ____________ as new devices are connected.

Answer 46

the potential difference (voltage) remains the same in each branch