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The potential difference between two conductors which are insulated from each other is measured in
Volts
(8023) (Refer to Figure 4.) How much power is being furnished to the circuit?
2,645 watts
Which term means .001 ampere?
Milliampere
.002KV equals
2.0 volts.
What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?
26 ohms.
Through which material will magnetic lines of force pass the most readily?
Iron
The voltage drop in a circuit of known resistance is dependent on
the amperage of the circuit.
Which symbol represents a variable resistor?
2
The unit of electrical pressure is the
volt
Which wire has the larger area, a 20-gage wire or a 10-gage wire?
A 10 gage wire.
A switch that can select either of two conditions for two circuits is called a ____ pole, ___ throw switch.
Double, double
The unit of electrical current is the
amp
The difference between a relay and a solenoid is in the core. A solenoid has _____ core.
movable
Fuses and circuit breakers are rated in the ____ they can take.
amps
The unit of electrical resistance is the
ohm
One ____ of electrical pressure will force one __ of current flow through a resistance of one ____
volt, amp, ohm
Five forms of energy that can be converted into electricity are: \n A. coal \n B. light \n C. magnetism \n D. nuclear \n E. pressure \n F. heat \n G. chemical action
B, C, E, F, G
The resistance of a light bulb may be found by _____ the voltage across the bulb by the current through it.
dividing
Electrical movement in a conductor is considered to be at the speed of
light
Electrons leave a source of electrical pressure at its ___ terminal and return at the ____ terminal.
negative, positive
The two metals which are the best conductors of electricity are; a. _____ b. _____
copper, silver
Four things that affect the resistance of a conductor are; \n A. length \n B. height \n C. density \n D. temperature \n E. ground \n F. cross-sectional area \n G. material \n H. weight \n I. color
A, D, F, G
Name the three components necessary in all electrical circuits.
Power, source, conductor.
Concerning Ohm’s law identify which statements are incorrect
Current is directly proportional to resistance
Resistance is directly proportional to voltage
Current is directly proportional to voltage
Resistance is inversely proportional to current
1, 2
100,000 ohms = ______ megohms.
0.1
0.005 A = ______ microamps
5000
The outer shell of an atom is called the _________ shell.
valance
What is the resistance of this resistor
630000
Which requires the most electrical power during operation?
Two lights requiring 3 amperes each in a 24 volt parallel systems.
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 \n Three position lights 20 watts each \n One heating element 5 amp \n One anticollision light 3 amp
450 watts.
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?
1,000 watts.
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.
Find the amount of power used by each of these components:
a. A 12 volt motor requiring 8 amperes = ___ watts.
b. Four 30 watt lamps in a 12 volt circuit = ___ watts.
c. Two light requiring 3 amperes each in a 24 volt parallel system = ____ watts.
d. A 1/10 horsepower, 24 volt motor which is 75% efficient = ___ watts.
96, 120, 144, 99.5
The power used by a bulb may be found by ______ the voltage across the bulb by the current through it.
multiplying
1 Horsepower = _____ watts
746
Note
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