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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. What must be large enough to carry the largest current likely to occur?
Alternating current
Grounding wire
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)
Breakdown voltage

2. What is the unit of measurement of electrical current?
Grounding wire
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)
Amperes
By their covering

3. What do transducers do in electrical terms?
Use an effect to produce another effect
Serial
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Amperes

4. What results when current is run through a material with high resistance?
Electrical resistance against the flow of current
Serial
Heat and current control(both a and c)
Strength of the charge

5. What determines whether a spark can be produced?
15 -000 ohms - 20%
Fixed - tapped - variable(all of the above)
Strength of the charge
Produce heat - light - or limit current to control it(all of the above)

6. What is the use of the electromagnet?
Silver
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
5%

7. A resistor is color coded brown - green - orange. What is its resistance?
Heat and current control(both a and c)
--^V^V^V^---
15 -000 ohms - 20%
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

8. What is insulation resistance?
Electrical resistance against the flow of current
American wire gauge(AWG)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Solenoid and Relay(both A and B)

9. What can permanently break down a capacitor?
Bonding and grounding
Silver
Insulation resistance and Dielectric strength(Both A and B)
Breakdown voltage

10. Identify the blueprint symbol for resistors.
Gauge number
Opposes any change in the current flowing in a circuit
--^V^V^V^---
Chemical action

11. What is a rigid metal conduit?
15 -000 ohms - 20%
Stores electrical charge
Alternating current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

12. How do you read resistor color codes?
A difference in potential energy
First digit is 9
Start with the band on the end and read to the center
5%

13. What is a DC circuit characteristic?
Porcelain
Moving vehicles
DC current
Current flows in one direction - potential differences across a load does not change(Both A and B)

14. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Voltmeter
1/1000th of an inch
Amperes

15. What is a type of mechanical transducer?
Choke
Solenoid and Relay(both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
5%

16. What is true about a dry cell?
Bare - covered - insulated - stranded - cable(All of the above)
Magnetic properties
Common - not rechargable - gradually discharges when in storage(All of the above)
Ohms

17. What is a wire classification?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
High resistance
Bare - covered - insulated - stranded - cable(All of the above)
Potential difference

18. When reading resistance color codes - what does the fourth band indicate?
The relationship of potential difference to current
Energy
Volts
Tolerence

19. What is another name for an inductor?
50 Ohms
Silver
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Choke

20. When reading resistance color codes - what does the first band indicate?
First digit
Magnetic properties
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Heat

21. What is voltage?
A difference in potential energy
Opposes any change in the current flowing in a circuit
DC current
Fixed - Electrolytic - Variable(all of the above)

22. What is the basic law of magnetic force?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
Unlike poles attract
10

23. What instrument measures voltage?
Bonding and grounding
Grounding wire
Voltmeter
Relationship between current and potential difference

24. What is an arrangement of materials that create a potential difference by chemistry?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
High resistance
Cell
Secondary cell

25. What makes electrons flow?
Breakdown voltage
Insulation resistance
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Potential difference

26. How is capacitance determined?
Potential difference
Area and spacing of capacitor - static current in the capacitor(both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
10%

27. What is resistance?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to movement of free electrons
Volts
The direction the negative charge moves

28. Which of the following is a type of resistor?
Electromagnetism
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
From the negative battery terminal to the positive terminal
Fixed - tapped - variable(all of the above)

29. What is the purpose of resistors in electrical circuits?
1 watt
Does not move
Produce heat - light - or limit current to control it(all of the above)
10%

30. Identify the blueprint symbol for capacitors.
Chemical action
Does not move
Symbol
Start with the band on the end and read to the center

31. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Electromagnetic field
Unlike poles attract

32. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
From the negative battery terminal to the positive terminal
Electromagnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

33. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
High resistance
The relationship of potential difference to current
Potential difference

34. What is the term for doing work at the rate of joule per second?
1 watt
The direction of the magnetic field
Resistance increases as the conductor length increases
Mutual induction

35. How many kinds of poles do magnets have?
Chemical action
Stores electrical charge
Two
From the negative battery terminal to the positive terminal

36. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Grounding wire
Solenoid and Relay(both A and B)

37. The generator is what method of creating potential energy?
Electromagnetism
Ohms
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Cells can be connected together to make a battery

38. Where does the thumb point in both Left-Hand Rules?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The direction the negative charge moves
Secondary cell
Ohms

39. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Secondary cell
Voltmeter
50 Ohms

40. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol
Ohms
75 Ohms

41. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
1/1000th of an inch
Amperes
Heat and current control(both a and c)

42. What do electrical charges need to cause a fire or explosion?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
20%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

43. How is the heat production measured in a resistor?
Secondary cell
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Potential difference - E*I - current times current change from point to point(all of the above)
Strength of the charge

44. What is the unit of measurement of potential difference?
A difference in potential energy
Volts
Relay
Electromagnetic field

45. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Choke
Current change in a coil creates a magnetic change
Tolerence
Alternating current

46. What is a switch that operates by electricity?
Choke
Unlike poles attract
Relay
Two

47. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Ohms
Cell
5%
By their covering

48. What does a third band of brown mean?
A difference in potential energy
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
10
American wire gauge(AWG)

49. Why is the transformer important to AC electricity?

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50. How do static charges distribute themselves?
DC current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
1/1000th of an inch
Potential difference - E*I - current times current change from point to point(all of the above)