Definition and Formula

Ohm's Law
Mathematical relationship between currrent, votage, and resistance,discovered by Geoge Simon Ohm.



I =V/R

Apparent Power ---Power apparently used in a circuit as a product of current multiplied by voltage.
 Henry(H):  Unit of measurement for inductance.


Impedance(Z):  Total re resistance to flow of an alternating current as a result of resistance and reactance.


Inductive Reactance(Xl):..Opposition to an AC current as a result of inductance.


Inductor: An electronic component used to produce inductance in a circuit.


Lenz's Law: Induced EMF in any circuit is always in such a direction as to oppose the effect that it produces.
Mutual Inductance: Two coils located so the magnetic flux of one coil can like with turns of the other coil. The change in flux of one coil will cause an EMF in the other.


Phase Angle(Q); The angle between vector Z and vector R in an AC circuit.

Power Factor(PF): Relationship between the true power and apparent power of a circuit.


Pythagorean Theorem: The square of the length of the hypotenuse of a right triangle equals the sum of the squares of the length of the other two sides.


Reactance (X): Opposition to alternating current as a result of inductance or capacitance.


Reactive Power: Power used by a reactive component of a circuit.


RL Circuit: A circuit that has resistance and inductance.


Self Induction: Emf-induced when it is in a current-carrying conductor.


Time constant: The period required for the the voltage of acircuit to increase to 63.2% of maximun value or decrease to 36.7% of maximun value.


Transient Response: Response to momentary signal or force.


True Power: Actual power absorbed on a circuit.


Volt-Ampere-Reactive(VAR): Unit of measure of reactive power.


Volt-Amperes(VA): Unit of measure of apparent power.




 



RCL Circuits

Acceptor:

Aseries-tuned circuit with resonace.

Attenuation:

Adecrease in amplitude or intensity.

Band -Rejecter Filter:

A filter circuit designed to reject currents in a continuous band of frequency, but to pass frequencies above or below the band.

Band Pass Filter:

A filter circuit designed to pass currents in a continuous band freqency, but to re ject or attenuate freequencies above or below the band.

Band

with:

Band of frequencises allowed for transmitting a modulated signal.

Damping Resistor:

Broadens the frequency response of the circuit by carrying a part of the line current which cannot be canceled at resonance.

Filter:

Circuit used to attenuate a specific band or bands of frequencies.

Flywheel Action:

Periodic current changes in a circuit.

Half-Power Points:

Points at which power is half of the maximun.

High-Pass Filter:

Passes high-frequency current while rejection low frequencies.

Low-Pass Filter:

A circuit intended to pass low frequency current while opposing high frequency current.

Oscillation:

Electronic tube generator of alternating current voltages.

Quality Factor:

Link between inductance, resistance, and capacitance.

RCL Network:

AC circuit that has resistors, capacitors, and inductors in a circuit to pass ,reject, or control current.

Reject Circuit:

Parallel tuned circuit with resonance.

Resonant Frequency:

Frequency at which a tuned circuit oscillates.

Selectively:

Relative ability of a receiver to select one signal while rejecting all other signals.

Tank Circuit:

Parallel resonant circuit.

Tuned Circuit:

Circuit containing capacitance, inductance and resistance in series or parallel. When engergized at a specific frequency known as its resonant frequency, an interchange of energy occurs between the coil and capacitor.