MTE Electrical 1

A transformer that has one winding, that is used for both the primary and secondary is called a(n) ______________.

autotransformer

In a series circuit, the sum of the voltage drops is ____________ the applied voltage.

equal to

In a capacitive circuit, the voltage leads the current by 90 electric degrees.

false

What is the basic unit of capacitance?

farad (F)

A charge curve for a capacitor is divided into _________ time constants.

five

The number of cycles completed in 1 second is called a ______________.

frequency

What color used as a multiplier band means to divide the combined first two numbers by 10?

gold

The neutral conductor is also referred to as the __________ conductor.

grounded

The unit of inductance is the __________.

henry (H)

What is the unit of measurement for inductance?

henry (H)

Frequency is measured in _____________.

hertz

A voltmeter has a very ____________ resistance connected in series with the meter movement.

high

Increasing the surface area of the plates will cause the capacitance of a capacitor to ____________.

increase

The valence shell of an atom is the ____________ shell.

outer

Most devices such as a light receptacle at home and office buildings are connected in ____________ circuits.

parallel

The maximum point of a waveform is called the ___________.

peak

The measure of a materials ability to be magnetized is called ____________.

permeability

During normal operation of a typical 120V appliance circuit, current flows through the hot, grounding, and neutral conductors.

False

Magnetic lines of force are referred to as ______________.

flux

A transformer in which the secondary voltage is more than the primary voltage is called a(n) ____________ transformer.

step-up

What meter measures true power in a circuit?

wattmeter

The amount of electrical power being used in a circuit is measured in ____________.

watts

Of the different power values in an RC circuit, which is known as apparent power?

VA

The power in a capacitor is reactive power. What is the unit for reactive power?

VAR

The symbol for reactive power of an inductor is ___________.

VARs

A three resistor circuit has a total power of 25 W. Two of the resistors dissipate 10 W & 5 W, respectively. How much power does the third resistor dissipate?

10 W

An electrical circuit has a voltage of 50V and a resistance of 5 ohm. What is the value of the current?

10 amps

An electrical circuit has a resistance of 20 ohms. The current is measured to be 6A. How many volts are applied to the circuit?

120 V

A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?

60 V

To test wire insulation, a special type of ohmmeter called a(n) ___________ is used.

MEGGER

The current, voltage, power, and resistance in a series circuit can be calculated using _____________ law.

Ohm's

The time required for current in an inductor to reach its full Ohm's law value is called the __________ time constant.

R-L

When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the ____________.

RC time constant

A circuit that has only one path for current flow is a __________circuit.

Series

A grounding conductor helps prevent a shock hazard in the event that an ungrounded, or hot, conductor comes in contact with the case or frame of an appliance.

True

Earth contains magnetic poles.

True

What is the applied voltage in a series circuit with two resistors of 25V and 60V, respectively.

85 V

When a capacitor is connected to a(n) ___________ circuit, current appears to flow through the capacitor.

AC

The grounding prong of a plug should never be cut off or bypassed.

True

The value of a resistor can often be determined by the "color code."

True

In the National Electrical Code, the current carrying abilities of conductors are called the ____________.

ampacities

One coulomb per second is equal to one ___________.

ampere

What meter measures resistance?

an ohmmeter

What meter must never be connected to a circuit when the circuit power is turned on?

an ohmmeter

A test meter that uses a scale and pointer to indicate values is a(n) ____________ meter.

analog

In parallel circuits, the voltage drop across any branch is the same as the _____________.

applied voltage

Static electricity refers to electrons that ____________ moving.

are not

What force is demonstrated in objects with unlike charges?

attraction

Alternating current is described as ___________________.

bidirectional

A combination circuit is a circuit that contains _________________.

both series and parallel components

A point that is used as a common connection for other parts of a circuit not actually driven into the ground is called a _____________ ground.

chassis

When a circuit has only one path, the ___________ is the same at any point.

current

Each complete waveform of 360 degrees is called a ______________.

cycle

If an object is placed in the field of a strong electromagnet connected to an AC line, the object will be ______________.

demagnetized

A voltage ____________ is used to provide different voltages between certain points in a circuit.

divider

Losses in the core of iron core inductors include ___________ and ___________.

eddy current; hysteresis

Polarized capacitors are also known as ____________ capacitors.

electrolytic

What type of magnet depends on flowing current to produce a magnetic field?

electromagnet

When a conductor cuts magnetic lines of force, a voltage is induced into the conductor. This principle is called ____________.

electromagnetic induction

The theory concerning current flow that is most widely accepted as being correct is the _______________ flow.

electron

What are the three principle parts of an atom?

electron, neutron, proton

Electrical current is the flow of ___________.

electrons

Energy in a capacitor is stored as a(n) ____________.

electrostatic charge

When a magnetic field continually changes magnitude and direction, a voltage is continually being induced in the coil. This voltage is called ___________ voltage.

induced

The amount of current that flows into a transformer primary when voltage is first applied is called ____________ current.

inrush

What is the nonconductive covering around a wire?

insulation

In a pure inductive circuit, the current _____________________.

lags voltage by 90 degrees

In a pure capacitive circuit, the current __________ the applied voltage by ___________.

leads; 90 degrees

In a parallel circuit, the total resistance is __________ value resistor.

less than the lowest

Conventional current theory states that current flows from the most positive point to the most ___________.

negative

A transformer supplying a house with 240/120 V has a secondary that is center tapped. The conductor connected to the center is called the ____________ conductor.

neutral

A junction of current paths is often called a ___________.

node

The shock that results from walking across a carpet and touching a doorknob is a(n) ___________ static charge.

nuisance

The unit of resistance to current flow is the ___________.

ohm

What is the unit for capacitive reactance?

ohm

A series circuit has ___________ path(s) for current flow.

one

Inductors always ___________ a change of current.

oppose

A capacitor is constructed by separating two metal conductors known as __________ with an insulating material known as a(n) ___________.

plates; dielectric

By observing the direction of current flow through the circuit, voltage __________ can be determined.

polarity

What is another term for a variable resistor?

potentiometer

The power input winding of a transformer is called the ____________ winding.

primary

The basic law of physics state that like charges ______________ and opposite charges _____________.

repel; attract

What force is demonstrated in objects with like charges?

repulsion

In a series circuit, the total _____________ is equal to the sum of the individual resistors.

resistance

The longer the conductor, the more ___________ it will have.

resistance

What type of load contains pure resistance?

resistive

When AC voltage is rectified and converted into DC, the resulting waveform is normally not pure, flat DC. The pulses that occur are called ___________.

ripples

The output winding of a transformer is called the ____________ winding.

secondary

An ammeter is connected in ____________ with the load to permit the load to limit current flow.

series

There is very little resistance and a large amount of current flows in a(n) ____________ circuit.

short

The voltage rating of a capacitor _________________.

should never be exceeded

Rotating machines normally produce a waveform called a ___________ wave.

sine

The ___________ effect occurs when AC induces eddy currents in to the conductor, which causes the electrons to be repelled toward the outer surface of the conductor.

skin

A transformer in which the secondary voltage is less than the primary voltage is call a(n) ____________ transformer.

step-down

In a parallel circuit, the total current flow is equal to the ___________ of the currents through all the branches.

sum

How many color bands are used on resistors that have a tolerance of +/- 20% ?

three

What is indicated by the fourth color band on a 4-band resistor?

tolerance

An isolation transformer has the same input and output voltages.

true

In a DC circuit, the product of (volts) x (amperes) is called the _________ power.

true

In a transformer, the turns of primary wire compared to the turns of secondary wire is called the ___________ ratio.

turns

Direct current is described as _________________.

unidirectional

A resistor whose values can be varied over a range of values is called a ____________ resistor.

variable

What is another term for electromotive force (EMF).

voltage

What meter is designed to be connected directly across the power source?

voltmeter

The amplitude of a waveform is measured from _______________.

zero to the highest value obtained in either direction

A two resistor series circuit has an an applied voltage of 100V. The voltage across one of the resistors is 40V. What is the voltage across the other resistor?

60 V

What letter symbolizes the farad?

F

What is the symbol for capacitive reactance?

XC

The symbol for inductive reactance is __________.

XL

What is a device that opposes a change of voltage?

a capacitor

Circuits that have more than one path for current flow are __________ circuits.

parrallel