quiz 5

a transformer has a primary coil with 100 turns and a primary voltage of 220 volts if the secondary coil has 50,000 turns the peak voltage across the secondary coil is

110kvp

what is the power rating of an x-ray 1000 ma at 110 kv

110kw 110000 w

a parallel circuit has three elements containing 8 ohms 12 ohms and 15 ohms if the circuit 110 volts what is the total voltage is the circuit

110v

a parallel circuit has three elements containting 8 ohms 12 ohs and 15 ohms if the circuit contains 110 volts what is the total voltage in the circuit.

110v

if a series circuit contains three elements each with 20 amps and 1.5 ohms 2.5 oms and 2 ohms respectively how many total volts are in the circuit

120v

a filament transformer of an xray unit has a turns ratio of 1: 30 if the radiographer activates the 500 ma station how much current is sent to the filament in the x ray

15a

if a series circuit contains 120 volts 20 amps and has three elements with 1.5 ohms 2.5 ohms and 2 ohms what is the total current

20 amps

a 60 ohms and 30 ohms resistors are in parallel what is the equivalent resistance

20 ohms

A string of holiday lights has ten bulbs with equal resistance connected in series when the string is connected to a 120 v outlet the current through the bulbs is 0.06a what is the total resistance of the circuit

200 ohms

a transformer has a turns ratio of 1:20 if 10 volts exit the transformer, how many volts where supplied to it

200 volts

A string of holiday lights has ten bulbs with equal resistance connected in series when the string is connected to a 120 v outlet the current through the bulbs is 0.06a what is the total resistance of the circuit

2000 oms

convert 0.2 seconds to milliseconds

250 milliseconds

if 15 coulombs pass a point in a circuit in 5.0 sec the current in the circuit is

3.0 a

what is the total resistance in a parallel circuit of 20 amps with resistance of 6 10 and 15

3.067 ohms

what is the amperage in in a series circuit of 110 volts with resistances of 5, 10 20 ohms

3.14 A

what is the total resistance in a series of 110 volts with resistances of 5, 10 and 20 ohms

3.14 a

a parallel circuit has three elements containing 12 ohms 8 ohms and 15 ohms if the circuit contains 110 volts what is its total resistance

3.6 ohms

a transformer has a turn ratio of 200:1 if 150 volts are applied to the primary side what is the secondary voltage

30,000

a transformer has a turn ratio of 200:1 if 150 volts are applied to the primary side what is the secondary voltage

30000

what is the total resistance in a series circuit of 110volts with resistance resistance of 5 10 and 20 ohms

35 ohms

if you have a circuit with a 60 volt battery and 12.5 ohm resistors in series what is the current in the circuit

4.80a

a transformer converts 460 v into 230 the power output is 2.3 kw how much current is drawn into the primary coil

5.0a

An electric iron connected to the main power supply of 220 v .when the iron is at the maximum it consumes a power of 840 w calculate the resistance

57.6 ohms

if a series circuit contains 120 volts, 20 amps and three elements with 1.5 ohms, 2.5 ohms and 2 ohms respectively what is the total resistance in the circuit.

6 ohms

an electric circuit contains 100 volts and 15 amps what is the resistances

6.7 ohms

three 20 ohm resistors are connected in a series across a 120 volt generator what is the equivalent resistance of the circuit

60 ohms

what is the voltage in a parallel circuit of 20 amps with resistance of 6, 10, 15 ohms

61.34v

convert 85,000 volts to kilowatts

85kw

if then 9.0 v batteries are connected in a parallel the total potential difference in the circuit will be

9.0v

if then 9.0 v batteries are connected in a series the total potential difference in the circuit will be

90 v

the advantage of AC power over DC power is that.

Ac power can be transmitted at higher voltages

Alessandro Volta

Invented the first battery

Thomas Edison

Invented the light bulb and opened the first electric power plant

what will a changing magnetic field cause to happen in a nearby coiled circuit through the process of electromagnetic induction

it causes alternating current (ac) to flow.

the work per second generated in an electrical circuit with given voltage and current has units of

joules

compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have

less resistance

which device would most likely be classified as a load in an electrical circuit

light bulb

all of the following are true of the laws of electrostatics except ?

only positive charges move along solid conductors

a ball is thrown straight upwards what kind of energy does it have at its highs point

only potential energy

how much power is produced in a circuit containing 110 volts and 20 amps

p=VxI 2.2kw

a circuit has 4 light bulbs one bulb goes out but the other three stays lit this must be a ____ circuit. parallel series

parallel

when the distance between two charges is doubled the force between them is

reduced by a factor of 4

which of the following is not a unit of energy

rem

to give an electrically neutral object a positive charge you must

remove electrons form it

A parallel circuit has three elements containing 8 oms and 15 ohms and 12 ohms if the circuit contains 110 volts what is total current

resistance = 3.63 V/R = current 110v/3.63 30.5 amps

what kind of transformer converts 230,000 v into 11,500 v

step down transformer

a transformer with more primary wingdings than secondary winding

step sown transformer

how is a voltage produced on a transformers secondary coil

the changing magnetic field in the core cuts across the secondary coil inducing a voltage

what is the subsystem of an x ray generator that converts low voltage electrical power to high voltage power through electromagnetic induction?

transformer.

A photon is the smallest amount of any form of electromagnetic radiation true false

true

Two objects will attract one another when they have opposite charges true false

true

a series circuit has only one path for the current to take true flase

true

a solenoid wrapped around an iron core that concentrates the magnetic field is called an electromagnet true false

true

a step-up transformer increases voltage and decreases current. true false

true

a transformer is a device that can change the voltage and current flowing through a circuit true false

true

alternating current is oscillation of electric current. true false

true

alternating current is the type of current required for a transformer true flase

true

an electric motor is a device that converts electrical energy into mechanical energy true false

true

electrodynamics are electrical charges that are in motion true false

true

electromagnetic radiation is radiation that travels in waves true false

true

electrostatics is the study of stationary electric charges true false

true

frequency is the rise and fall of a sine wave true false

true

magnesium is one of the fundamental forces and when a charged particle is in motion a magnetic force field at sixty degrees to the motion will be created. true false

true

objects can be electrified by friction, contact and induction true false

true

power is the rate of energy production or expenditure per unit time true false

true

reification is the process by which alternating current is changed to pulsating direct current true false

true

the attraction of hair to briskly rubbed plastic comb is an example of electrodynamics true false

true

the auto-transformer is used to vary the incoming line voltage to an appropriate level for the high voltage step-up transformer true false

true

the build of electrical charges on an object is called static charges true false

true

the law of magnetism stats that like poles repel, opposite poles attract,and the magnetic force of attraction between poles is determined by the inverse square law true false

true

the total voltage of a parallel circuit is equal to the voltage in each element of the circuit true false

true

the transformer law states that the ratio of the number of coil turns in the primary winding to the number of coil turns in the secondary winding is equal to the ratio of the primary voltage to the secondary voltage true false

true

the unit of resistance is ohm true false

true

the velocity of electromagnetic radiation is the speed of light true false

true

transformers are principal components of generators true false

true

transformers convert low voltage into high voltage through processes of electromagnetic induction true false

true

a transformer has a turn ratio 50:1 if 20 amps are supplied to the transformer what is the secondary current

.4 amps

a 1.5 v battery is attached to 1 ohm and 2-ohm resistors in series. what is the current

0.50a

an electric iron is connected to the main power supply of 220 v when the iron is at the minimum it consumes a power of 360 w calculate the current

1.64 A

what is the kinetic energy of a 500 kg portable x-ray machine traveling at a speed of 2 meters per sec

1000 joules

Current is measured by an

ammeter

why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off

as more resistors are added in parallel the total resistance decrease which causes an increase in the total amount of current

electrical devices with tow terminals that allow current to flow in one direction only

diode

what is the negative charge particle that flows through a circuit.

electron

1 watt of power is consumed when 10 ampere of current flows through a device at a potential difference of 1 volt true false

false

A semiconductor is a device that acts as an insulator only true false

false

a 9v battery in a circuit with three resistors connected in series it the resistance will decrease true false

false

a solenoid is a coil of wire through which electricity can flow true false

false

a substance that inhibits the flow of current is a conductor true false

false

an electric generator converts electrical energy to mechanical energy true false

false

copper is a bad conductor true false

false

the conversion of alternating current into directed current is called transformation true flase

false

Ben Franklin

flew a kite during a thunderstorm to demonstrate that lighting was electrical current.

a copper wire is connected to a 6v battery and has a certain amount of current flowing through it, which of the following changes will result in an increase in the current in the copper wire

increasing the thickness of the wire.

an iron nail can be turned into a temporary magnet if it held in a strong magnetic field this method of magnetization is called

induction

oil is used in many large transforms to

insulate the core

Michael Faraday

invented the first electric motor

why is a transformer core made from iron

iron is very dense