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Physics > Electricity and Circuits > Flashcards

Electricity and Circuits Flashcards

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1
Q

An electric field is a force field caused by?

A

Charges

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2
Q

Electric force and gravitational force are alike in that both forces

A

are field forces

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3
Q

Objects become electrically charged as a result of the transfer of

A

electrons

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4
Q

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

A

electromagnetic force

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5
Q

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

A

negative

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6
Q

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

A

positive

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7
Q

The term used to describe electrical pressure is __________.

A

voltage

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8
Q

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

A

electrons

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9
Q

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

A

closed

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10
Q

current

A

amperes

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11
Q

voltage

A

volts

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12
Q

resistance

A

ohms

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13
Q

charge

A

coloumbs

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14
Q

Substances whose atoms have more free electrons are called ________.

A

conductors

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15
Q

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

A

insulators

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16
Q

Electric current in a wire is the

A

rate at which electric charges move through a wire.

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17
Q

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

A

closed

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18
Q

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

A

complete conducting path connecting two terminals

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19
Q

What is Ohm’s Law?

A

V=IR

20
Q

voltage is the

A

potential difference between two points in a circuit.

21
Q

Power outlets in our homes generally have a potential difference of

A

120 V

22
Q

squiggly line

A

AC

23
Q

dotted/straight line

A

DC

24
Q

A Battery makes this type of current.

A

DC

25
Q

A generator makes this type of current.

A

AC

26
Q

AC flows

A

back and forth

27
Q

DC flows

A

in one direction

28
Q

Electrical resistance in a wire depends on the wire’s

A

all of these (temp, length, thickness)

29
Q

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

A

power

30
Q

Which statement is correct regarding electric power.

A

Electric power = current x potential difference

31
Q

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

A

electrical load

32
Q

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

A

Current is reduced by half.

33
Q

Electrical resistance is measured in

A

ohms

34
Q

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

A

long thin

35
Q

Which of the following is a unit of power?

A

joule per second

36
Q

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

A

current

37
Q

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

A

lamp 2

38
Q

What arrangement would make the brightest light?

A

2 bulbs connected in parallel with 2 batteries

39
Q

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

A

All the lights go out

40
Q

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

A

parallel

41
Q

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

A

Only that light goes out

42
Q

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?

A

series

43
Q

A short circuit is

A

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

44
Q

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

A

A and C

45
Q

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

A

It is the same across each branch as the supply voltage

46
Q

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

A

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

Physics (9 decks)

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