Physics 22-23 test review

Electric energy is transferred from generating stations to consumers' premises at extremely low voltage

false

a circuit breaker is a short peice of metal that melts when a current that is too large passes through it

false

a fuse is an automatic switch that opens when the current reaches a threshold value

false

a parallel connection is a type of electric circuit in which there is a single current path

false

a resistor is a device that converts chemical energy into electric energy

false

a series connection is a type of electric circuit in which there are multiple paths

false

ammeters have a very high resistance so as to cause the smallest possible change in currents and voltages in the circuit

false

an ampere is a unit used by electric companies to measure electrical energy use

false

one kilowatt-hour is equal to the energy consumed by an electric device of 1 W for 1 hour

false

using a 1-kW heater for one hour consumes more energy than using a 100-W bulb for one day

false

a short peice of metal that melts when a large current passes thorugh it is a

fuse

an ________ is described as a peice of metal that acts as a saftey device in a circut which metls and stops the flow of current

fuse

an __________ is described as a device that detects current differnces and then opens the circuit preventing electrocution

ground fault intupreter

if a resistor is added to a series circuit, the equivilent resistance

increases

a _____________ is equal to 1000 watts delivered continuously for 3,600 seconds

killowatt-hour

an ____________ is an energy unit used to measure electric energy use by power companies

kilowatt-hour

what is the effect on the current in a simple circuit when both the voltage and the resistance are divided by 2?

no change

the number of current paths in a series circuit is

one

an _____________ is described as a type of circuit in which there are several current paths

parallel circuit

an _____________ is a type of electric circuit in which there are multiple paths, whereas an ____________ is a type of electric circuit in which there is a single current path

parallel connection ; series connection

_____________ is described as a property that determines how much current will flow for a given battery voltage

resistance

________________ is a property that determines how much current will flow for a given source voltage, whereas a _______________ is a device that controls the current in a circuit

resistance ; resistor

a _________ is described as a device w specific resistance and is used to control current

resistor

A _____________ is described as a device with specific resistance and is used to control current, whereas a ______________ converts chemical energy to electrical energy

resistor ; battery

an _________________ is described as a type of circiut in which there is only a single current path

series circuit

an ___________ is a type of electric circuit in which there is a single current path

series connection

an _________ occurs when a very low resistance circuit is formed and can easily start a fire

short circuit

a circuit, which includes series and parallel branches, is called a combined series-parallel circuit

true

a conventional current is the flow of positive charges that move from a higher to lower potential energy

true

a ground-fault interrupter in an electric outlet prevents injuries because it contains an electronic circuit that detects differnsences in current caused by an extra path and opens the circuit

true

a resistor is a device that controls current in electric circuits

true

a short circuit occours when a circuit with a very low resistance is formed

true

all household devices are connnected in parallel bc they are designed to operate at the same voltage

true

an electric circuit is a closed loop or pathway that allows electric charges to flow

true

arc fault circuit interruperts use electronic detectors to respond to the electric signals associated with arcing ; they can shut down a circuit in many cases where a circuit breaker would react

true

as current moves through any circuit, the net change in potenial must be zero

true

circuit breakers are connected in series so that the circuit will open in case of dangerously high current

true

fuses and ciruit breakers protect against the large currents created by a short circuit

true

in an electric circuit fuses and circuit breakers act as safety devices

true

in order to measure the current through a resistor, an ammeter is placed in series with the resistor

true

it is necessary to understand series and parallel circuits to fully understand residential wiring

true

resistance is a property that determines how much current will flow in a circuit

true

the cables used to transfer electric energy from the generating station to the consumers must be of low resistance to reduce losses due to joule heating

true

the flow of electric charge or current that is equal to one coulomb per second is an ampere

true

to measure the potential drop across a resistor, a voltmeter is connected in parallel with a resistor

true

voltage dividers are often used with sensors such as photosensors

true

voltmeters are designed to have a very high resistance so as to cause the smallest possible change in currents and voltages in the circuit

true

without a fuse or circuit breaker the current caused by a short circuit easily could start a fire

true

an _____________ is described as a series circuit that is used to produce a lower voltage from a higher voltage battery

voltage driver

an _________ is used to measure the voltage drop across a portion of a circuit

voltmeter

an __________ is described as a device that is used to measure voltage drop across any part of a circuit

voltmeter

ideally, the resistance of an ammeter should be

zero

a car panel lamp has a resistance of 33 ohms when it is placed across a 12 V battery. what is the current through the circuit ?

.36 A

A flashlight bulb is rated at 0.90 W. if the electric potenital drop across the lightbulb is 3.0 V, how much current goes through it ?

0.30 A

a lamp uses 15 W of power when it is connected across 25 V. What is the current through the lamp?

0.60 A

a lightbulb uses 75 W of power when it is connected across a 125 V source. what cuurent does the lamp draw?

0.60A

a lighbulb uses 100 W of power when connected across 120 V. WHAT Is the current drawn by the lightbulb?

0.8 A

a motor with an operating resistance of 32 ohms is connected to a voltage source. the current in the circuit is 3.8 A. what is the voltage of the source?

1.2 x 10(2)V

a sensor uses 2.0x10(-4) A of current when it is operated by 3.0 V battery. What is the resistance of the sensor circuit?

1.5 x 10(4) ohms

a lamp draws a current of 0.50 A when it is connected to a 120 V source. what is the resistance of the lamp?

2.4x10(2) ohms

the current going through a car starter is 210 A. If the battery maintains 12 V across the motor , how much electric energy is delivered to the starter in 10.0 s?

2.52 x 10(4) J

a car battery causes a current of 2.0 A through a lamp and produces 12 V across it. what is the power used by the lamp?

24 W

the current through a lightbulb connected across the terminals of a 125 V outlet is 0.50 A. assuming 100% effeciancy, at which rate does the bulb convert electric energy to light?

63 W

a 50 ohm resistor is connected to a 9.0 V battery. how much thermal energy is produced in 7.5 minuets?

7.3 x 10(2) J

a series circuit has four resistors. the current through one resitor is 810 mA. how much current is supplied by the source?

810 mA

an __________ is descirbed as a low resistance device connected in series that is used to measure current

ammeter

an _____________ is a deivce that is used to measure the current in any branch or part of a circuit

ammeter

which device measures the current in a circuit

ammeter

an _______________ is described as the flow of electric charge or current equal to one coulumb per second

ampere

the flow of electric charge or current equal to one coulumb per second is a __________

ampere

a _____________ is described as a device that converts chemical energy into electric energy

battery

an automatic switch that opens when the current reaches a set value is called

circuit breaker

an _____________ is decribed as an automatic switch that acts as a safeguard in an electric current

circuit brekaer

an ________________ is described as the flow of positive charges the move from a higher to lower potential energy

conventional current

an ______________ is the flow of positive charges that move from higher to lower potential energy, whereas an ____________ is described as a flow of charged particles

conventional current ; electric current

in a series circuit, each cirucit element has the same

current

if a resistor is added to a parallel circuit, the equivlent resistance

decreases

an ______________ is described as a closed loop or pathway that allows electric charges to flow

electric circuit

an ________________ is described as a closed loop or pathway that allows electric charges to flow. whereas an _______________ is described as a flow of charged particles

electric circuit ; electric current

an ____________ is described as a flow of charged particles

electric current

an _______________ is described as the flow of charged particles

electric current

________ is descirbed as the sum of all the individual restances in a series

equivilent resistance