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