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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 is a way to classify wires and cables?
By their covering
Ability to store an electric charge
DC current
Breakdown voltage

2. What does a first band of white mean?
Alternating current
5%
Resistance value can not be changed
First digit is 9

3. What type of circuit has one path of follow through a load?
12 volts
Series circuit
Chemical action
Volts

4. What is a switch that operates by electricity?
Relay
Volts
10
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)

5. What is a common form used in conductors?
Bare - covered - insulated - stranded - cable(All of the above)
Cables
Amperes
The rate of doing work

6. How is capacitance determined?
Symbol
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Fixed - Electrolytic - Variable(all of the above)

7. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
The direction the negative charge moves
Current flows in one direction - potential differences across a load does not change(Both A and B)
Porcelain

8. To what measurement do the conductor mills refer?
1/1000th of an inch
Magnetic properties
Heat
--^V^V^V^---

9. What wire measurement is commonly used in the U.S.?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
American wire gauge(AWG)
Porcelain
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

10. What is the term for doing work at the rate of joule per second?
1 watt
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Gauge number
Insulation resistance and Dielectric strength(Both A and B)

11. How many kinds of poles do magnets have?
Voltmeter
Two
Circular and square mills(Both A and B)
Cells can be connected together to make a battery

12. What does a third band of brown mean?
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)
High resistance
10

13. What types of protective tapes are used?
10%
Relationship between current and potential difference
A difference in potential energy
Plastic - Rubber - Friction(all of the above)

14. What is the basic law of magnetic force?
Unlike poles attract
High resistance
Current change in a coil creates a magnetic change
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

15. What is the relationship between magnetism and electricity?
First digit is 9
By their covering
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)
Bonding and grounding

16. What is a property of inductors in electrical circuits?
Solenoid and Relay(both A and B)
Opposes any change in the current flowing in a circuit
Energy
Grounding wire

17. 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
Breakdown voltage
12 volts
Tolerence
Silver

18. What does a moving charge produce?
A magnetic field
Produce heat - light - or limit current to control it(all of the above)
Magnetic properties
Cell

19. What results when current is run through a material with high resistance?
Insulation resistance and Dielectric strength(Both A and B)
Heat and current control(both a and c)
Symbol
DC flows continuously in one direction and AC potential difference and current both change direction

20. What is the term for two or more cells attached together?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy
Battery

21. What are the two generic methods to eliminate static electricity from metal objects?
Alternating current
Insulation resistance
Bonding and grounding
Mutual induction

22. What is resistance in electrical terms?
Magnetic properties
Circular and square mills(Both A and B)
10%
Opposition to electrical current

23. What is the measure of potential difference?
Series circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Volts
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

24. What is a rigid metal conduit?
Purging
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Electrical resistance against the flow of current
Tolerence

25. What is an electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Current change in a coil creates a magnetic change
--^V^V^V^---

26. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
The relationship of potential difference to current
Mutual induction
Gauge number
Purging

27. What is induction?
High resistance
Current change in a coil creates a magnetic change
Electrical resistance against the flow of current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

28. What determines whether a spark can be produced?
Cells can be connected together to make a battery
Strength of the charge
American wire gauge(AWG)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

29. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Resistance value can not be changed
Tolerence
Current change in a coil creates a magnetic change

30. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
The direction of the magnetic field
15 -000 ohms - 20%
Volts

31. When reading resistance color codes - what does the fourth band indicate?
Tolerence
75 Ohms
Stranded
Voltage

32. What is power?
Purging
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
The rate of doing work
Heat

33. 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
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
75 Ohms
Moving vehicles
Serial

34. What is a type of mechanical transducer?
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Solenoid and Relay(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

35. What is a DC circuit characteristic?
Voltage
20%
Electromagnetic field
Current flows in one direction - potential differences across a load does not change(Both A and B)

36. What is the relationship between cells and batteries?
Ability to store an electric charge
The rate of doing work
Grounding wire
Cells can be connected together to make a battery

37. Which of the following materials is NOT a good conductor?
Energy
5%
Porcelain
Insulation resistance and Dielectric strength(Both A and B)

38. What information do the Left-Hand Rules provide?
20%
Start with the band on the end and read to the center
10
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

39. What is the type of cable composed of many fine wires?
Stranded
DC current
Battery
Heat

40. What is dielectric strength?
How much potential difference can a material withstand before breaking down
5%
Magnetic properties
Circular and square mills(Both A and B)

41. What is needed for electric heating elements and the filaments of light bulbs?
Strength of the charge
High resistance
Current change in a coil creates a magnetic change
Bonding and grounding

42. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Silver
Strength of the charge
Stranded

43. The generator is what method of creating potential energy?
DC flows continuously in one direction and AC potential difference and current both change direction
Strength of the charge
Moving vehicles
Electromagnetism

44. What instrument measures voltage?
Relationship between current and potential difference
Serial
Voltmeter
Battery

45. What is voltage?
A difference in potential energy
The direction the negative charge moves
Porcelain
The rate of doing work

46. How do you read resistor color codes?
50 Ohms
Start with the band on the end and read to the center
The direction of the magnetic field
The direction the negative charge moves

47. Which material has the lowest resistance at ordinary temperatures?
Relay
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Silver
Current flows in one direction - potential differences across a load does not change(Both A and B)

48. A resistor is color coded brown - green - orange. What is its resistance?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Alternating current
15 -000 ohms - 20%
Gauge number

49. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Unlike poles attract
Mutual induction
1 watt
Resistance value can not be changed

50. Identify the general blueprint symbol for inductors.
Symbol
By their covering
Opposition to electrical current
From the negative battery terminal to the positive terminal