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This opposition to current flow is known as resistance (R), and the unit of measure is

the ohm

Good conductors will have

a low resistance.

Resistance of the conductor is directly proportional

to its length

If a resistor cross sectional area is doubled and the length is halved the resistance

will be quadruple

Electrical Resistivity: it depends only on the material, and is a property of the material and is

independent of the dimensions of the conductor.

If for an increase in temperature the resistance of a material increases, it is said to have:

a positive temperature coefficient.

Temperature increase most conductors electrical resistance will:

increase

In Color code Resistor the fourth band, which:

is the tolerance

the total circuit resistance (RT) is equal to

the sum of the individual resistances

This ability of resistance dissipate heat caused by the resistance is :

wattage rating

The heat dissipating capability of a resistor is measured in

Watts

Conductance is:

directly proportional to area, and inversely proportional to the length of the material.

The unit of conductance is ........, which is ohm spelled backwards. Wheatstone bridge

the mho (G)

In the Operation of the Wheatstone Bridge to find RX the ratio (

Rx to R2 is equal to the ratio of R3 to R4)

ratio (Rx/R2 =

R3/R4)

Rx =

A potentiometer is

a variable tapped resistor that can be used as a voltage divider (voltage source).

One of the disadvantage of carbon resistor is:

they have a tendency to change value as they age

When voltage exists but current does not flow because the circuit is open:

no work is done.

the basic power formula is :

P = V x I,

If the voltage is increased the power will

increase.

The basic unit of power is the

watt.

Power was expressed by :

alternate pairs three basic quantities V, I, and R.

Maximum power is transfer theorem states; Maximum power is transferred to the load when the internal resistance of the supply is:

equal to the resistance of the load.

2 thermo elements connected in parallel voltage 28v and current 10amp the power is:

560w

The larger the physical size of a carbon resistor:

the higher the wattage rating.

One horsepower is equal to

746 watts.

In a series circuit, the total power is equal to:

the SUM of the power dissipated.

A circuit has a voltage source that delivers 6 volts and the circuit uses 3 watts of power. What is the resistance of the load? R=v²/p

12 ohms

Capacitance is measured in units called

farads.

Factors Affecting the Value of Capacitance The value of capacitance of a capacitor depends on three factors:

The area (A) of the plates1. 2. The distance (d) between the plates. 3. The dielectric constant (permittivity) of the material between the plates.

The specific measure of a material acceptance of magnetic flux is known as:

Permeability

The force between opposite electrical charges

attraction

The lines of force are polarized :

from positive to negative

Capacitors in Series

Ct=c1×c2÷(c1+c2

Capacitors in Parallel

CT = C1 + C2 + C3 +…….Cn

Dielectric breakdown force is measured in :

coulomb per square meter

The type of the capacitor used where large amount of capacitance required is called :

electrolytic

A capacitor is a device that stores electrical energy in

an electrostatic field.

The relation between the distance between the plates and the charge is:

inversely proportional

In A variable capacitor (when the plates are over- lapped the capacitance will be:

maximum and the working voltage is decreases).

When a capacitor is fully charged and the source voltage is equaled by the counter electromotive force (back-EMF) across the capacitor, the electrostatic field between the plates of the capacitor is

maximum.

Since the electrostatic field is maximum the energy stored in the dielectric

is also max.

Magnetism is: the property of a material which enables it

to attract pieces of iron

The two ends which are regain of concentrated lines of force are called:

the poles of the magnet.

One of the following is not the characteristic of magnetic lines of force :

not continuous

Artificial magnets are:

Magnets produced from magnetic materials

Magnetic lines of force pass through :

all materials

What magnetic properties is associated with soft iron :

easily magnetized but readily demagnetized

Through which material will magnetic lines of force pass the most readily?

Iron

The degree of magnetization of a material that responds linearly to an applied magnetic field is:

permeability

In SI units, permeability is measured in

henries per meter (H/m), or Newton's per ampere squared (N/A2).

the permeability of free space is:

4pi×10 ̄ ⁷ H/m

Their relative permeability of a diamagnetic is :

less than 1

When a ferrite core is placed inside a coil, the flux density :

increased due to the relative permeability of the core

The opposition that a material offers to the magnetic lines of force is:

reluctance

The theory of magnetism that corresponds to the direction rotation of Atom within a material is called:

Domain Theory

The area of the Hysteresis Loop indicates:

energy expanded in magnetizing and demagnetizing a material

Magnetic field strength unit is:

amp. Turn/meter

The unit of flux density is the

Tesla (T)

The amount of magnetic flux per unit cross sectional area is known as:

flux density associated with magnetic field measured in tesla

The intensity of a magnetic field is :

directly related to the magnetic force exerted by the field

The relationship between absolute permeability μ and relative permeability, μr and vacuum permeability μ0 is defined by the formula:

μ = μₒ • μr

Relative permeability of steel is in the range:

1000-10,000

Fleming’s Left Hand (Motor) Rule

The thumb indicates the direction of Motion

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問題一覧

This opposition to current flow is known as resistance (R), and the unit of measure is

the ohm

Good conductors will have

a low resistance.

Resistance of the conductor is directly proportional

to its length

If a resistor cross sectional area is doubled and the length is halved the resistance

will be quadruple

Electrical Resistivity: it depends only on the material, and is a property of the material and is

independent of the dimensions of the conductor.

If for an increase in temperature the resistance of a material increases, it is said to have:

a positive temperature coefficient.

Temperature increase most conductors electrical resistance will:

increase

In Color code Resistor the fourth band, which:

is the tolerance

the total circuit resistance (RT) is equal to

the sum of the individual resistances

This ability of resistance dissipate heat caused by the resistance is :

wattage rating

The heat dissipating capability of a resistor is measured in

Watts

Conductance is:

directly proportional to area, and inversely proportional to the length of the material.

The unit of conductance is ........, which is ohm spelled backwards. Wheatstone bridge

the mho (G)

In the Operation of the Wheatstone Bridge to find RX the ratio (

Rx to R2 is equal to the ratio of R3 to R4)

ratio (Rx/R2 =

R3/R4)

Rx =

A potentiometer is

a variable tapped resistor that can be used as a voltage divider (voltage source).

One of the disadvantage of carbon resistor is:

they have a tendency to change value as they age

When voltage exists but current does not flow because the circuit is open:

no work is done.

the basic power formula is :

P = V x I,

If the voltage is increased the power will

increase.

The basic unit of power is the

watt.

Power was expressed by :

alternate pairs three basic quantities V, I, and R.

Maximum power is transfer theorem states; Maximum power is transferred to the load when the internal resistance of the supply is:

equal to the resistance of the load.

2 thermo elements connected in parallel voltage 28v and current 10amp the power is:

560w

The larger the physical size of a carbon resistor:

the higher the wattage rating.

One horsepower is equal to

746 watts.

In a series circuit, the total power is equal to:

the SUM of the power dissipated.

A circuit has a voltage source that delivers 6 volts and the circuit uses 3 watts of power. What is the resistance of the load? R=v²/p

12 ohms

Capacitance is measured in units called

farads.

Factors Affecting the Value of Capacitance The value of capacitance of a capacitor depends on three factors:

The area (A) of the plates1. 2. The distance (d) between the plates. 3. The dielectric constant (permittivity) of the material between the plates.

The specific measure of a material acceptance of magnetic flux is known as:

Permeability

The force between opposite electrical charges

attraction

The lines of force are polarized :

from positive to negative

Capacitors in Series

Ct=c1×c2÷(c1+c2

Capacitors in Parallel

CT = C1 + C2 + C3 +…….Cn

Dielectric breakdown force is measured in :

coulomb per square meter

The type of the capacitor used where large amount of capacitance required is called :

electrolytic

A capacitor is a device that stores electrical energy in

an electrostatic field.

The relation between the distance between the plates and the charge is:

inversely proportional

In A variable capacitor (when the plates are over- lapped the capacitance will be:

maximum and the working voltage is decreases).

When a capacitor is fully charged and the source voltage is equaled by the counter electromotive force (back-EMF) across the capacitor, the electrostatic field between the plates of the capacitor is

maximum.

Since the electrostatic field is maximum the energy stored in the dielectric

is also max.

Magnetism is: the property of a material which enables it

to attract pieces of iron

The two ends which are regain of concentrated lines of force are called:

the poles of the magnet.

One of the following is not the characteristic of magnetic lines of force :

not continuous

Artificial magnets are:

Magnets produced from magnetic materials

Magnetic lines of force pass through :

all materials

What magnetic properties is associated with soft iron :

easily magnetized but readily demagnetized

Through which material will magnetic lines of force pass the most readily?

Iron

The degree of magnetization of a material that responds linearly to an applied magnetic field is:

permeability

In SI units, permeability is measured in

henries per meter (H/m), or Newton's per ampere squared (N/A2).

the permeability of free space is:

4pi×10 ̄ ⁷ H/m

Their relative permeability of a diamagnetic is :

less than 1

When a ferrite core is placed inside a coil, the flux density :

increased due to the relative permeability of the core

The opposition that a material offers to the magnetic lines of force is:

reluctance

The theory of magnetism that corresponds to the direction rotation of Atom within a material is called:

Domain Theory

The area of the Hysteresis Loop indicates:

energy expanded in magnetizing and demagnetizing a material

Magnetic field strength unit is:

amp. Turn/meter

The unit of flux density is the

Tesla (T)

The amount of magnetic flux per unit cross sectional area is known as:

flux density associated with magnetic field measured in tesla

The intensity of a magnetic field is :

directly related to the magnetic force exerted by the field

The relationship between absolute permeability μ and relative permeability, μr and vacuum permeability μ0 is defined by the formula:

μ = μₒ • μr

Relative permeability of steel is in the range:

1000-10,000

Fleming’s Left Hand (Motor) Rule

The thumb indicates the direction of Motion