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Science
Engineering
Electrical Engineering
Basic electricity Progressive 2 Study guide
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Terms in this set (45)
When calculating power in a reactive or inductive ac circuit, the true power is?
less than the apparent power
The basis for transformer operation in the use of alternating current is mutual?
Inductance
When different rated capacitors are connected in parallel in a circuit, the total capacitance is?
equal to the sum of all the capacitors
The term that describes the combined resistive forces in an ac circuit is?
impedance
What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?
The current is stepped down by a 1 to 4 ratio
The opposition offered by a coil to the flow of alternating current is called?
Inductive reactance
In an ac circuit, the effective voltage is
Less than the max instantaneous voltage
An increase in what factors will cause an increase in the inductive reactance of a circuit
Inductance and frequency
The working voltage of a capacitor in an ac circuit should be?
At least 50% greater than the highest applied voltage
The amount of electricity a capacitor can store is directly proportional to the?
plate area and inversely proportional to the distance between the plates
Capacitors are sometimes used in DC circuits to
smooth out slight pulsations in current/voltage
When inductors are connected in series in a circuit, the total inductance is (where the magnetic fields of each inductor do not affect the others)
Equal to the sum of the individual inductances
Transfer of electric energy from one circuit to another without the aid of electrical connections is called
induction
Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be
Effective values
What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively? Note (CT=1 + C2 + C3
.04 microfarad 4UF
State the three factors which determine capacitance
The area of the storage plates , The separation between the plates and The composition of dielectric
Unit of measure for frequency
Hertz (Hz)
The unit of measure of inductance
Henry (H)
The unit of measure of capacitance
Farad ( f)
Unit of measure for sin wave
AC
Impedance unit of measurement
Ohms
Capacitive Reactance measurement
Ohms
What is the opposition to the flow of AC provided by a magnetic field with generated back voltage EMF
Inductive reactance
Electrostatic fields are also known as
Dielectric fields
When different rated capacitors are connected in a series circuit the total capacitance is
less than the capacitance of the lowest rated capacitor
Convert farads to microfarads by
multiplying farads by 10 to the power of 6
Convert farads to picofarads by
multiplying farads by 10 to the power of 12
When more than two inductors of different inductances are connected in a parallel circuit the total inductance is
less than the inductance of the lowest rated inductor.
What is the total capacitance of a circuit containing three capacitors in a parallel with capacitances of .02 microfarad .05 Microfarad and 10
.170 UF and the other is .0125 UF
Which statement is correct when made in reference to a parallel circuit
The total current is equal to the sum of the currents through the individual branches of the circuit.
Which is correct in reference to electrical resistance
If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.
Alternation
one half of a cycle
Period
the time required for one cycle, a complete motion that returns to its starting point
mutual inductance
When alternating current flows in a conductor the changing lines of flux radiate out and cut across other nearby conductors
Capacitance
the ability of a conductor to store energy in the form of electrically separated charges (Electro Chemical process)
Capacitive Reactance
opposition to the flow of current of alternating current caused by the capacitance in a circuit
Apparent Power
Product of effective voltage and effective current.
Expressed in Volt-Amps
phase angle
Angle whose cosine is the power factor
In a capacitive circuit the current leads voltage by 90
...
In an inductive circuit the Voltage leads current by 90
...
Inductance
Creation of a magnetic field around a conductor which generates voltage
Mutual inductance
The Generation of voltage of one conducted by another
Inductive Reactance
The Generation of back voltage inducted by its own coil
Capacitance
The storage of Electricity within an Electristatic field
Frequency resonance
When reactance and capacitance are equal of value
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