Test 2 Bishop 2nd year

1

Which Scientist discovered that a magnetic field always surrounds a conductor in which an electric current is flowing?

1

The Magnetic Field will only exist around a wire while the electric current _________ flowing.

1

No Electric Current = No Magnetic Field

1

The Magnetic Field collapses when the current is __________________.

1

If the switch is ____________, there will be no current.

1

If the switch is _____________, there will be a current flowing.

1

Magnetic Field lines form ______________ around the wire.

1

The closer to the wire, the _____________ the Magnetic Field.

1

If the wire is a loop, the Magnetic Field lines are concentrated (strongest) on the ____________ of the loop.

1

If you stack many loops together (coil) with an electric current flowing, the Magnetic Field ______________.

1

A coil of wire with an electric current is a _______________.

1

The Magnetic Field can be intensified further by wrapping a coil of wire around a _________________ material.

1

The majority of the magnetic field lines are ____________ the coil.

1

"The Magnetic Field can be intensified further by wrapping a coil of wire around a ferromagnetic material (iron)". This is considered _____________________.

1

A(n) ________________ is a current-carrying coil of wire wrapped around an iron-core, which intensifies the Magnetic Field.

1

A Solenoid can be used as a remote control magnet.

1

In Radiography, a _______________ is used as a tube stand lock and bucky tray lock.

1

When you open and close a switch an electric current starts and ______________.

1

What did Faraday want to prove?

1

Faraday concluded that an electric current _________ be induced by the presence of a magnet.

1

When a magnet is in motion, the intensity changes, an electric current is ________________.

1

The changing of the Magnetic Field to produce an electric current is _______________________.

1

Electromagnetic Induction is AKA ______________________ law.

1

The basis of Faraday's Law was that ____________ Magnetic Field intensity induces an electric current.

1

The magnitude of the induced current depends on four factors. The strength of the magnetic field is one of them.

1

Select the following factors that induce the magnitude of the current:

1

Electric Motors and Generators are NOT good examples of Oersted's and Faraday's Laws.

1

In Radiography, an electric induction motor is used to _____________________.

1

Within the Electric motor, what is considered the "Fixed Electromagnetic's"?

1

The Electric Motor is a good example of __________________ Law(s).

1

Within the Electric Motor, what is considered "copper bars and iron core"?

1

_______________________ is supplied to the AC induction motor.

1

In an AC induction motor the EXTERNAL Magnetic Field is supplied by an _________ number of fixed electromagnets called a stator.

1

A ___________ is placed inside this arrangement of stators as the armature.

1

The AC current supplying one opposite pair of coils is ___________ phase with the current supplying the next pair of coils.

1

In the production of diagnostic x-rays, it is necessary to ______________ the incoming line voltage of 110 or 220 into the kilovoltage range.

1

A transformer does convert one energy to another.

1

Electric Potential AKA ____________________.

1

Current AKA ____________________.

1

A Transformer transforms electric potential (voltage) and current (flow of electrons) into higher or lower intensity.

1

A transformer changes the intensity of alternating __ and _.

1

Consider an electromagnet with a FERROMAGNETIC core bent around so that it forms a continuous loop.

1

Transformers.
There are no end surfaces from which the field lines can escape.

1

Transformers.
The __________________ tends to be confined to the loop of the magnetic core material.

1

Another coil wound around the other side of the loop of core material.

1

Will the Magnetic Field produced by the PRIMARY coil pass through the center of the SECONDARY coil?

1

A good _____________ is created between the magnetic field produced by the primary coil and the secondary coil.

1

The PRIMARY (input) coil is supplied with ____________________. *Establishing a magnetic field around the coil.

1

Which coil is responsible for establishing a magnetic field around the coil?

1

The Primary Magnetic Field will cut the __________________ coil and induce an Electromagnetic Field (EMF) and alternating current (AC).

1

A changing current in the primary coil induces a changing current in the secondary coil.

1

A Transformer will operate only with changing current, ________________________.

1

The transformer is used to change the magnitude of _____________ and current in an AC circuit.

1

The change in voltage is _____________ proportional to the ratio of number of turns (winding's) of the secondary coil (Ns) to the number of turns in the primary coil (Np).

1

Voltage is induced in each of the turns of the _________________ coil.

1

Turns Ratio:

1

Secondary coil turns are 10 times more than the Primary coil turns.

1

The turns ratio is part of the _________________ Law Formula.

1

What is the Transformer Law?

1

A step-up transformer ____________ the potential difference.

1

A step-up transformer will have a turn ratio greater than ___________.

1

Does a step-up transformer have more turns in the secondary coil or primary coil?

1

Step-Up transformer:
_________________ EMF (voltage)

1

Step-Up transformer:
________________ current

1

Step-Up transformer:
___ is doubled, is halved.

1

A Step-Down transformer _________________ the potential difference.

1

A Step-Down transformer will have a turn ratio of less than ___________.

1

With the Step-Down transformer there are more turns in the __ coil than the _ coil.

1

Step-Down Transformer:
________________ EMF (voltage)

1

Step-Down Transformer:
__________________ current

1

Step-Down Transformer:
_____ is halved, _ doubles

1

In a Step-Up transformer, the current on the secondary side is ______________ than the current on the primary side.

1

In a Step-Down transformer, the secondary current is _____________ than the primary current.

1

According to ______________'s Law, Voltage and Current are inversely proportional.

1

The # of transformer turns and induced amperage must also be inversely proportional.

1

The Effect of Transformer Law on Current may be written as:

1

A _________________-core transformer consists of heavily insulated coils wound around a square or circular iron core.

1

The ___________________ core is not a single piece but rather built up of laminated layers of iron.

1

Laminated layers help reduce ______________ loses, resulting in greater efficiency.

1

An AUTO-TRANSFORMER consists of an iron core with ____________ winding wire around it.

1

The single wire on the AUTO-TRANSFORMER acts as __________________.

1

Which transformer operates using self-induction?

1

Autotransformer:
Connections are made at ___________ points on the coil for both the primary and secondary sides.

1

Autotransformers are usually larger than regular transformers.

1

Autotransformers are generally used when a ___________ step-up or step-down in voltage is required.

1

A _______________ transformer consists of a laminated silicon steel core with two rectangular holes and a central section.

1

The insulated coils on a Shell-Type transformer are wound around the ________________ section of the core.

1

Shell-Type Transformer:
Insulated coils are wound around the central section of the core to __________ the distance magnetic flux has to travel between the two coils.

1

A Shell-Type Transformer reduces the distance the magnetic flux has to travel and therefore decreases the leakage flux.

1

Which transformer is the most currently used type of transformer?

1

Which transformer is more efficient?

1

The effectiveness of _____________ induction is increased with Shell-type Transformer.

1

Quiz am Test 2 Bishop 2nd year, erstellt von Analisa Olivarez am 03/10/2016.

Test 2 Bishop 2nd year

Which Scientist discovered that a magnetic field always surrounds a conductor in which an electric current is flowing?

The Magnetic Field will only exist around a wire while the electric current _________ flowing.

No Electric Current = No Magnetic Field

The Magnetic Field collapses when the current is __________________.

If the switch is ____________, there will be no current.

If the switch is _____________, there will be a current flowing.

Magnetic Field lines form ______________ around the wire.

The closer to the wire, the _____________ the Magnetic Field.

If the wire is a loop, the Magnetic Field lines are concentrated (strongest) on the ____________ of the loop.

If you stack many loops together (coil) with an electric current flowing, the Magnetic Field ______________.

A coil of wire with an electric current is a _______________.

The Magnetic Field can be intensified further by wrapping a coil of wire around a _________________ material.

The majority of the magnetic field lines are ____________ the coil.

"The Magnetic Field can be intensified further by wrapping a coil of wire around a ferromagnetic material (iron)". This is considered _____________________.

A(n) ________________ is a current-carrying coil of wire wrapped around an iron-core, which intensifies the Magnetic Field.

A Solenoid can be used as a remote control magnet.

In Radiography, a _______________ is used as a tube stand lock and bucky tray lock.

When you open and close a switch an electric current starts and ______________.

What did Faraday want to prove?

Faraday concluded that an electric current _________ be induced by the presence of a magnet.