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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 true about a dry cell?
Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Fixed - tapped - variable(all of the above)

2. What is the type of cable composed of many fine wires?
Two
Fixed - tapped - variable(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stranded

3. What must be large enough to carry the largest current likely to occur?
Bonding and grounding
Grounding wire
Magnetic properties
50 Ohms

4. A resistor is color coded brown - green - orange. What is its resistance?
Opposition to movement of free electrons
15 -000 ohms - 20%
Insulation resistance
Silver

5. What are the common units of measurement for round and square conductor cross - sections?
The rate of doing work
Stranded
Circular and square mills(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

6. Which type of cell can be recharged?
Does not move
Secondary cell
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposition to movement of free electrons

7. What does Ohm's Law represent?
Relationship between current and potential difference
Electrical resistance against the flow of current
Parallel
A difference in potential energy

8. Which of the following is a type of resistor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
By their covering
Opposes any change in the current flowing in a circuit
Fixed - tapped - variable(all of the above)

9. What is a switch that operates by electricity?
Symbol
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Cell
Relay

10. Why is the transformer important to AC electricity?

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11. What is induction?
The rate of doing work
Current change in a coil creates a magnetic change
Ohms
Current flows in one direction - potential differences across a load does not change(Both A and B)

12. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Volts
Ohms
Potential difference

13. What are the two generic methods to eliminate static electricity from metal objects?
High resistance
Bonding and grounding
Silver
Resistance increases as the conductor length increases

14. The thermocouple uses which method for creating potential energy?
Symbol
How much potential difference can a material withstand before breaking down
Chemical action
Heat

15. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Secondary cell
Voltmeter
Cell

16. What is a DC circuit characteristic?
First digit
Electromagnetism
Current change in a coil creates a magnetic change
Current flows in one direction - potential differences across a load does not change(Both A and B)

17. What makes electrons flow?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference
Moving vehicles
Insulation resistance

18. What is voltage?
Silver
A difference in potential energy
Unlike poles attract
How much potential difference can a material withstand before breaking down

19. What is the fundamental property of insulators?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cables
Insulation resistance and Dielectric strength(Both A and B)
First digit is 9

20. What is a common cause of static electricity in a shop?
Grounding wire
Moving vehicles
Silver
Porcelain

21. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Breakdown voltage
Potential difference - E*I - current times current change from point to point(all of the above)
Volts
Alternating current

22. What makes electrons flow?
Potential difference
Start with the band on the end and read to the center
--^V^V^V^---
Bare - covered - insulated - stranded - cable(All of the above)

23. What is the term for doing work at the rate of joule per second?
High resistance
10
1 watt
The relationship of potential difference to current

24. What does a moving charge produce?
The direction the negative charge moves
High resistance
Parallel circuit
A magnetic field

25. To what measurement do the conductor mills refer?
Insulation resistance and Dielectric strength(Both A and B)
Heat
1/1000th of an inch
Choke

26. What is an arrangement of materials that create a potential difference by chemistry?
Energy
Secondary cell
High resistance
Cell

27. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
The relationship of potential difference to current
Cell
Bonding and grounding

28. How do you read resistor color codes?
Start with the band on the end and read to the center
75 Ohms
American wire gauge(AWG)
The direction the negative charge moves

29. When reading resistance color codes - what does the fourth band indicate?
Resistance value can not be changed
Tolerence
Wire splices
50 Ohms

30. What do junction boxes protect?
Wire splices
Use an effect to produce another effect
Fixed - Electrolytic - Variable(all of the above)
10

31. What is insulation resistance?
How much potential difference can a material withstand before breaking down
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electrical resistance against the flow of current

32. What does an object have if a magnetic field acts on it?
The direction the negative charge moves
Silver
Magnetic properties
Produce heat - light - or limit current to control it(all of the above)

33. What is resistance in electrical terms?
Opposition to electrical 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)
Ohms
Opposes any change in the current flowing in a circuit

34. What is resistance?
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
Bonding and grounding
Opposition to movement of free electrons

35. What is a common form used in conductors?
Magnetic properties
Cables
Battery
Heat

36. Identify the general blueprint symbol for inductors.
Fixed - Electrolytic - Variable(all of the above)
Stranded
Symbol
Parallel

37. What is capacitance in electrical terms?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
First digit is 9
Heat
Ability to store an electric charge

38. What type of circuit has one path of follow through a load?
The relationship of potential difference to current
Series circuit
Symbol
Opposes any change in the current flowing in a circuit

39. When does a DC circuit oppose current flow?
Potential difference
Voltmeter
Fixed - Electrolytic - Variable(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

40. Which material has the lowest resistance at ordinary temperatures?
Strength of the charge
Silver
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Produce heat - light - or limit current to control it(all of the above)

41. What is needed for electric heating elements and the filaments of light bulbs?
Ohms
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Use an effect to produce another effect
High resistance

42. What is power?
Start with the band on the end and read to the center
The rate of doing work
Choke
50 Ohms

43. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance
Insulation resistance and Dielectric strength(Both A and B)

44. What is the name for electrical resistance of insulation?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
50 Ohms
Insulation resistance
Voltage

45. What is a way to classify wires and cables?
By their covering
The relationship of potential difference to current
Series circuit
Voltmeter

46. What determines the resistance of a resistor?
Heat and current control(both a and c)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Composition of the resistor
Stranded

47. Identify the blueprint symbol for resistors.
Mutual induction
--^V^V^V^---
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Strength of the charge

48. How do static charges distribute themselves?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Electromagnetic field

49. What is the unit of measurement of potential difference?
Volts
Use an effect to produce another effect
DC current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

50. What do transducers do in electrical terms?
--^V^V^V^---
Use an effect to produce another effect
From the negative battery terminal to the positive terminal
Solenoid and Relay(both A and B)

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Basic Electricity

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