BASIC ELECTRICITY Flashcards
The working voltage of a capacitor in an ac circuit should be
at least 50 percent greater than the highest applied voltage
The term that describes the combined resistive forces in an ac circuit is
impedance
The basis for transformer operation in the use of alternating current is mutual
inductance
The opposition offered by a coil to the flow of alternating current is called (disregard resistance)
inductive reactance
An increase in which of the following factors will cause an increase in the inductive reactance of a
circuit?
inductance and frequency
When different rated capacitors are connected in series in a circuit, the total capacitance is
less than the capacitance of the lowest rated capacitor
Capacitors are sometimes used in dc circuits to
smooth out slight pulsations in current/voltage
In an ac circuit, the effective voltage is
Less than the maximum instantaneous 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
Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be
effective values
When different rated capacitors are connected in parallel in a circuit, the total capacitance is
(Note: C(T) = C(1) + C(2) + C(3) . . .)
equal to the sum of all the capacitances
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)
(Note: L(T) = L(1) + L(2) + L(3) . . .)
equal to the sum of the individual inductance
The potential difference between two conductors which are insulated from each other is measured in
volts
A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?
24 volts
When calculating power in a reactive or inductive ac circuit, the true power is
less than the apparent power
The correct way to connect a test voltmeter in a circuit is
in parallel with the unit
Which term means .001 ampere?
milliampere
.002KV equals
2.0 volts
What unit is used to express electrical power?
watt
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 of the following are commonly used as rectifiers in electrical circuits?
1. Anodes.
2. Cathodes.
3. Diodes
3
Diodes are used in electrical power supply circuits primarily as
rectifiers
Transfer of electric energy from one circuit to another without the aid of electrical connections
is called induction
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
