Electric
A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be
equal to the voltage across the 20-watt light.
2.0 volts
.002KV equals. A KV is a kilovolt or 1000 volts
A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? (Note: 1 horsepower = 746 watts )
1,000 watts
(Refer to figure 13.) determine the total current flow in the circuit
1.4 amperes.
(Refer to figure 5.) what is the impedance of an ac-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms and a resistor with a resistance of 8 ohms
10 ohms The total reactance in this circuit is the difference between the inductive reactance and the capacitive reactance. Total reactance is 10-4= 6 ohms. The impedance is the square root of the resistance squared plus the reactance squared. This is the square root of 64 plus 36, or the square root of 100. The circuit impedance of 10 ohms.
A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?
10 volts
In a parallel circuit with three 6-ohm resistors across a 12- volt battery, what is the total current (It) value in the circuit?
2 amps
(Refer to figure 64.) A 24 volt source is required to furnish 48 watts to a parallel circuit consisting of two resistors of equal value. What is the value of each resistor? (Note: R(t) = e ^ 2/P
24 ohms
(Refer to Figure 11.) Find the voltage across the 8-ohm resistor.
24 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
How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?
25.23 amperes
What is the operating resistance of a 30-watt light bulb designed for a 28-volt system? R = E ^ 2 / P
26 ohms
(Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B?
3.0 volts
A 1-horsepower, 24-volt dc electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12-volt dc electric motor that is 75 percent efficient require?
994.6 watts. (746/0.75= watts)
Which requires the most electrical power?
A 1/5 horsepower, 24 volt moto which is 75 percent efficient
At least 35 milliwatts
A 14 ohm resistor is to be installed in a series circuit carrying 0.05 ampere. How much power will the resistor be required to dissipate
36 ohms.
A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?
Heavy power circuits
A circuit protection device called a current limiter is essentially a slow- blow fuse and is designed to be used in
Dielectric fields
A field of force exists around a charged body
Guarded switched
Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ
Which of these will cause the resistance of a conductor to decrease?
Decrease the length or increase the cross-sectional area.
Electrostatic fields are also known as
Dielectric fields
450 watts
How much power must a 24 volt generator furnish to a system which contains the following loads? Unit rating One motor (75 percent efficient) 1/5 hp Three position lights 20 watts each One heating element 5 amp One anti collision light 3 amp
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.
How should a voltmeter be connected?
In parallel with the load
The amperage of the circuit
The voltage drop in a circuit of known resistance is dependent on what?
What is the advantage of a current limiter?
It will take overload for a short period
21.2 ohms
Refer to figure 12 Find the total resistance of the circuit
17 ohms
Refer to figure 14. The total resistance of the circuit is
Infinite resistance
Refer to figure 7 if resistor r (3) is disconnected at terminal D, what will the ohmmeter read?
Single pole, single throw (Spst), two position switch
The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. The switch is referred to as a
Volts
The potential difference between two conductors which are insulated from each other is measured in
What are two things that determine voltage drop across a circuit?
The resistance of the conductor and the amount of current flowing through it (amperage)
What referencing resistance in a parallel DC circuit, which of the following statements is true?
The total current is equal to the sum of the currents through the individual branches of the circuit.
Which is correct concerning a parallel circuit ?
Total resistance will be smaller than the smaller resistor
Which requires the most electrical power during operation?
Two lights requiring 3 amperes each in 24 volt parallel system
Watt
What unit is used to express electrical power?
Series with the light
When adding a rheostat to a light circuit to control the light intensity, it should be connected in
Ground reference
When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
static energy
Which effect does not apply to the movement of electrons "flowing in a conductor?"