Electrical Circuits Terms
Card Set Information
Electrical Circuits Terms
basic electronic terms
The voltage drop in an inductor due to opposition is dictated by:
the property of an electric circuit as a result of which an electromotive force is created by a change of current in the same circuit
a property of a conductor by virtue of which the passage of current is opposed, causing electric energy to be transformed into heat:
equal to the voltage across the conductor divided by the current flowing in the conductor
element where voltage and current are in phase w/ peak values
purely resistive element
the opposition of inductance and capacitance to alternating current, expressed in ohms:
equal to the product of the sine of the angular phase difference between current and voltage and the ratio of the effective voltage to the effective current
the total opposition to alternating current by an electric circuit
equal to the square root of the sum of the squares of the resistance and reactance of the circuit and usually expressed in ohms
the flow of current source and magnetic field
current in ac circuits
A measure of the ability of a configuration of materials to store electric charge.
the number of cycles or completed alternations per unit time of a wave or oscillation.
the number of periods or regularly occurring events of any given kind in unit of time, usually in one second.
the number of times that a periodic function or vibration repeats itself in a specified time, often 1 second. It is usually measured in hertz ν, f
electric potential difference between two points of an electric field.
the drop of electrical potential or potential difference on the load in an electrical circuit.
angular velocity measured in radians per second (rad/s)
the rate of energy consumption in an electrical circuit
The power that is used to do the work on the load
P = Vrms Irms cos φ
the power that is wasted and not used to do work on the load
Q = Vrms Irms sin φ
the power that is supplied to the circuit
S = Vrms Irms
P^2 + Q^2 = S^2
Real power, reactive power and apparent power
The ratio of the real power that is used to do work and the apparent power that is supplied to the circuit:
The power factor can get values in the range from 0 to 1.
When all the power is reactive power with no real power (usually inductive load) - the power factor is
When all the power is real power with no reactive power (resistive load) - the power factor is
equal to the absolute value of the cosine of the apparent power phase angle φ (which is also is impedance phase angle):
energy is directly transferred by the movement of electrons or ions
Energy is transferred by electromagnetic field