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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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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. What is the difference between AC and DC?
Unlike poles attract
First digit
DC flows continuously in one direction and AC potential difference and current both change direction
Secondary cell

2. Identify the blueprint symbol for resistors.
Cells can be connected together to make a battery
Opposition to electrical current
Symbol
--^V^V^V^---

3. What types of protective tapes are used?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Plastic - Rubber - Friction(all of the above)
Mutual induction
Does not move

4. What do transducers do in electrical terms?
Heat
Use an effect to produce another effect
Relay
Ability to store an electric charge

5. What is the type of cable composed of many fine wires?
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)
Stranded
Volts
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

6. What is a common cause of static electricity in a shop?
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)
Fixed - tapped - variable(all of the above)
Stranded
Moving vehicles

7. What is induction?
Porcelain
Does not move
Insulation resistance and Dielectric strength(Both A and B)
Current change in a coil creates a magnetic change

8. Why is the transformer important to AC electricity?
Battery
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)
Parallel circuit
Bonding and grounding

9. What is the term for two or more cells attached together?
Battery
Purging
First digit is 9
Current change in a coil creates a magnetic change

10. The generator is what method of creating potential energy?
Potential difference
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)
Electromagnetism

11. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Purging
Current flows in one direction - potential differences across a load does not change(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

12. When does a DC circuit oppose current flow?
Volts
How much potential difference can a material withstand before breaking down
Unlike poles attract
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

13. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Tolerence
10%
Does not move
Silver

14. What does resistance produce?
The direction the negative charge moves
Heat
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
1/1000th of an inch

15. What makes electrons flow?
Potential difference
1/1000th of an inch
Chemical action
--^V^V^V^---

16. What do junction boxes protect?
Wire splices
The direction of the magnetic field
Parallel
Moving vehicles

17. What is the unit of measurement of resistance?
Ohms
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Potential difference
First digit is 9

18. What is the unit of measurement of potential difference?
Volts
A difference in potential energy
Fixed - Electrolytic - Variable(all of the above)
10

19. What results when current is run through a material with high resistance?
Parallel
Heat and current control(both a and c)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Strength of the charge

20. When reading resistance color codes - what does the first band indicate?
High resistance
First digit
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed

21. What is the fundamental property of insulators?
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction the negative charge moves
Gauge number
Insulation resistance and Dielectric strength(Both A and B)

22. What determines the resistance of a resistor?
Composition of the resistor
A magnetic field
Start with the band on the end and read to the center
Ability to store an electric charge

23. How is the heat production measured in a resistor?
DC current
Ohms
Potential difference - E*I - current times current change from point to point(all of the above)
75 Ohms

24. What is a common form used in conductors?
Electromagnetism
Cables
Wire splices
Stranded

25. How many kinds of poles do magnets have?
By their covering
First digit is 9
Two
Potential difference - E*I - current times current change from point to point(all of the above)

26. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Stranded
5%
Heat

27. What is the measure of potential difference?
Volts
Current flows in one direction - potential differences across a load does not change(Both A and B)
Opposition to electrical current
Opposition to movement of free electrons

28. What is the relationship between cells and batteries?
A magnetic field
Heat
Cells can be connected together to make a battery
Two

29. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Heat
Cables
A difference in potential energy

30. What does static electricity do?
Electromagnetic field
Plastic - Rubber - Friction(all of the above)
Does not move
Grounding wire

31. What does an object have if a magnetic field acts on it?
Magnetic properties
Breakdown voltage
How much potential difference can a material withstand before breaking down
Symbol

32. What is the use of the electromagnet?
20%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Battery
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

33. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Current flows in one direction - potential differences across a load does not change(Both A and B)
50 Ohms
Current change in a coil creates a magnetic change
Bonding and grounding

34. What is capacitance in electrical terms?
Ability to store an electric charge
Ohms
Bonding and grounding
The direction of the magnetic field

35. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Symbol
Potential difference
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Purging

36. What is insulation resistance?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Heat
Opposes any change in the current flowing in a circuit
Electrical resistance against the flow of current

37. Given R=E / I and the following information - plug in the data and solve the problem for resistance. 1.5 volt walkman battery - 0.02 amps of current
Bonding and grounding
Moving vehicles
75 Ohms
Serial

38. Identify the blueprint symbol for capacitors.
Symbol
Fixed - tapped - variable(all of the above)
Opposition to electrical current
50 Ohms

39. What are the names of two of the six primary methods of producing a voltage?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Moving vehicles
The rate of doing work

40. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
A magnetic field
20%
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

41. Where do the fingers point in both Left-Hand Rules?
Plastic - Rubber - Friction(all of the above)
The direction of the magnetic field
Solenoid and Relay(both A and B)
1/1000th of an inch

42. What is a characteristic of insulators?
Strength of the charge
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
--^V^V^V^---
Electromagnetism

43. What does a moving charge produce?
Cell
Solenoid and Relay(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
A magnetic field

44. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Start with the band on the end and read to the center
Alternating current
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)

45. What cannot be transformed to higher or lower potential differences?
1 watt
DC current
Cables
10%

46. What is power?
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)
Grounding wire
The rate of doing work
Magnetic properties

47. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
12 volts
Electrical resistance against the flow of current
Voltmeter

48. What is the purpose of a raceway?
Symbol
Breakdown voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Resistance increases as the conductor length increases

49. In most applications - what remains constant if the current remains constant and flows in one direction?
Choke
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relay
Electromagnetic field

50. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Current change in a coil creates a magnetic change
The relationship of potential difference to current
Mutual induction
Produce heat - light - or limit current to control it(all of the above)

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