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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10%
20%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

2. What does a moving charge produce?
The direction of the magnetic field
Resistance increases as the conductor length increases
Porcelain
A magnetic field

3. What is a common measure of wire diameter?
Ability to store an electric charge
Gauge number
Produce heat - light - or limit current to control it(all of the above)
Bonding and grounding

4. What is a common form used in conductors?
Composition of the resistor
Circular and square mills(Both A and B)
Voltage
Cables

5. What is the measure of potential difference?
The rate of doing work
Serial
A magnetic field
Volts

6. What makes electrons flow?
From the negative battery terminal to the positive terminal
10%
Resistance increases as the conductor length increases
Potential difference

7. How many kinds of poles do magnets have?
Two
Energy
Current flows in one direction - potential differences across a load does not change(Both A and B)
Bare - covered - insulated - stranded - cable(All of the above)

8. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
The direction the negative charge moves
Electromagnetic field
Tolerence

9. What is power?
Two
Volts
The rate of doing work
Volts

10. What do junction boxes protect?
Symbol
Start with the band on the end and read to the center
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Wire splices

11. What is an arrangement of materials that create a potential difference by chemistry?
Plastic - Rubber - Friction(all of the above)
Cables
Cell
Insulation resistance

12. What is a type of capacitor?
Cell
Bonding and grounding
Fixed - Electrolytic - Variable(all of the above)
A magnetic field

13. What is the purpose of capacitors in electrical circuits?
First digit is 9
Parallel
Stores electrical charge
Opposition to movement of free electrons

14. What are the common units of measurement for round and square conductor cross - sections?
Magnetism produces a field and the field exerts force on a moving charge - every moving electrical charge produces a magnetic field - and the magnetic field is strong when the electrical charge is strong and moves rapidly(all of the above are true)
A magnetic field
Electrical resistance against the flow of current
Circular and square mills(Both A and B)

15. What is the purpose of resistors in electrical circuits?
75 Ohms
Produce heat - light - or limit current to control it(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
It increases or decreases the potential difference of AC electricity - It is effective with almost no loss of power - It's use- cost is very low(All of the above)

16. What is a property of inductors in electrical circuits?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposes any change in the current flowing in a circuit
Electromagnetic field
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

17. What does a third band of brown mean?
Bare - covered - insulated - stranded - cable(All of the above)
Gauge number
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10

18. What is induction?
12 volts
Potential difference - E*I - current times current change from point to point(all of the above)
Current change in a coil creates a magnetic change
10%

19. Which of the following is a type of resistor?
Volts
A magnetic field
Fixed - tapped - variable(all of the above)
Grounding wire

20. When reading resistance color codes - what does the fourth band indicate?
Electrical resistance against the flow of current
Common - not rechargable - gradually discharges when in storage(All of the above)
Tolerence
Grounding wire

21. What do electrical charges need to cause a fire or explosion?
--^V^V^V^---
Series circuit
Silver
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

22. What is the term for two or more cells attached together?
Fixed - tapped - variable(all of the above)
Breakdown voltage
Magnetic properties
Battery

23. What is the relationship between magnetism and electricity?
Magnetism produces a field and the field exerts force on a moving charge - every moving electrical charge produces a magnetic field - and the magnetic field is strong when the electrical charge is strong and moves rapidly(all of the above are true)
Bare - covered - insulated - stranded - cable(All of the above)
Stranded
DC current

24. Given E=I X R and the following information - plug in the data and solve the problem for voltage. 0.015 ohms - 800 amps of current
Bare - covered - insulated - stranded - cable(All of the above)
Resistance increases as the conductor length increases
12 volts
Gauge number

25. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
10
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Strength of the charge
Serial

26. What is the unit of measurement of electrical current?
Heat and current control(both a and c)
Electromagnetic field
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Amperes

27. What cannot be transformed to higher or lower potential differences?
The direction the negative charge moves
DC current
Voltage
Start with the band on the end and read to the center

28. What must be large enough to carry the largest current likely to occur?
First digit is 9
Serial
From the negative battery terminal to the positive terminal
Grounding wire

29. In most applications - what remains constant if the current remains constant and flows in one direction?
Unlike poles attract
Electromagnetic field
DC current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

30. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)
Start with the band on the end and read to the center
5%

31. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy
10

32. What is a way to classify wires and cables?
DC current
Fixed - tapped - variable(all of the above)
By their covering
12 volts

33. What is the fundamental property of insulators?
Symbol
Insulation resistance and Dielectric strength(Both A and B)
Electromagnetic field
Plastic - Rubber - Friction(all of the above)

34. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
American wire gauge(AWG)
Opposes any change in the current flowing in a circuit
Voltage

35. What does a transformer transform?
Electromagnetism
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
--^V^V^V^---
The relationship of potential difference to current

36. What is the difference between AC and DC?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Use an effect to produce another effect
Silver
DC flows continuously in one direction and AC potential difference and current both change direction

37. What is resistance in electrical terms?
Opposition to electrical current
Current flows in one direction - potential differences across a load does not change(Both A and B)
Cells can be connected together to make a battery
Unlike poles attract

38. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
From the negative battery terminal to the positive terminal
Breakdown voltage
20%
15 -000 ohms - 20%

39. What is the name for electrical resistance of insulation?
Insulation resistance
First digit
Common - not rechargable - gradually discharges when in storage(All of the above)
Electrical resistance against the flow of current

40. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Unlike poles attract
Stores electrical charge
Voltmeter

41. What do transducers do in electrical terms?
Resistance increases as the conductor length increases
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference
Use an effect to produce another effect

42. What is a characteristic of a fixed resistor?
10
Resistance value can not be changed
Fixed - Electrolytic - Variable(all of the above)
Heat

43. What is insulation resistance?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Two
Electrical resistance against the flow of current
Fixed - Electrolytic - Variable(all of the above)

44. What is the purpose of a raceway?
American wire gauge(AWG)
75 Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

45. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Moving vehicles
Gauge number
Voltage
Resistance increases as the conductor length increases

46. What is a conductor?
Electromagnetism
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Start with the band on the end and read to the center
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

47. Identify the blueprint symbol for capacitors.
Symbol
Volts
12 volts
75 Ohms

48. To what measurement do the conductor mills refer?
Does not move
1/1000th of an inch
Battery
Symbol

49. What information do the Left-Hand Rules provide?
Cables
Electrical resistance against the flow of current
Heat
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

50. What is resistance?
Opposition to movement of free electrons
Mutual induction
Produce heat - light - or limit current to control it(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)