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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 makes electrons flow?
Cell
Resistance increases as the conductor length increases
Breakdown voltage
Potential difference

2. What is a property of inductors in electrical circuits?
Amperes
Opposes any change in the current flowing in a circuit
Relay
How much potential difference can a material withstand before breaking down

3. Which of the following materials is NOT a good conductor?
Choke
Porcelain
American wire gauge(AWG)
Symbol

4. What is the relationship between cells and batteries?
DC flows continuously in one direction and AC potential difference and current both change direction
Insulation resistance and Dielectric strength(Both A and B)
Cells can be connected together to make a battery
Porcelain

5. What is the purpose of capacitors in electrical circuits?
Gauge number
Porcelain
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Stores electrical charge

6. Identify the general blueprint symbol for inductors.
Solenoid and Relay(both A and B)
Symbol
Opposition to electrical current
Electromagnetism

7. What do transducers do in electrical terms?
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)
First digit is 9
Cells can be connected together to make a battery
Use an effect to produce another effect

8. What is an arrangement of materials that create a potential difference by chemistry?
Current change in a coil creates a magnetic change
Gauge number
Cell
Use an effect to produce another effect

9. What does Ohm's Law represent?
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
Volts
Relationship between current and potential difference

10. Which type of cell can be recharged?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Secondary cell
Produce heat - light - or limit current to control it(all of the above)
Fixed - Electrolytic - Variable(all of the above)

11. A resistor is color coded brown - green - orange. What is its resistance?
Electromagnetism
10
15 -000 ohms - 20%
Potential difference - E*I - current times current change from point to point(all of the above)

12. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
75 Ohms
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to electrical current

13. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
12 volts
75 Ohms
Volts

14. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Gauge number
First digit
The direction of the magnetic field

15. What do we call the ability to do work?
Wire splices
American wire gauge(AWG)
Energy
15 -000 ohms - 20%

16. When reading resistance color codes - what does the fourth band indicate?
Wire splices
Tolerence
Cells can be connected together to make a battery
Opposition to movement of free electrons

17. What is the use of the electromagnet?
Insulation resistance and Dielectric strength(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts
Battery

18. What is a type of capacitor?
Stores electrical charge
Fixed - Electrolytic - Variable(all of the above)
Opposition to electrical current
Two

19. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Bare - covered - insulated - stranded - cable(All of the above)
Solenoid and Relay(both A and B)
Symbol
10%

20. How do static charges distribute themselves?
Mutual induction
Opposition to movement of free electrons
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Electrical resistance against the flow of current

21. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Tolerence
Heat
The direction of the magnetic field

22. What is the difference between AC and DC?
Opposition to movement of free electrons
Heat
--^V^V^V^---
DC flows continuously in one direction and AC potential difference and current both change direction

23. What does a third band of brown mean?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

24. What does a first band of white mean?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
First digit is 9
Fixed - Electrolytic - Variable(all of the above)
Electrical resistance against the flow of current

25. What is the term for doing work at the rate of joule per second?
Common - not rechargable - gradually discharges when in storage(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
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)
1 watt

26. What is the term for two or more cells attached together?
Opposes any change in the current flowing in a circuit
How much potential difference can a material withstand before breaking down
Cables
Battery

27. What is insulation resistance?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Symbol
Electrical resistance against the flow of current
75 Ohms

28. What is power?
Produce heat - light - or limit current to control it(all of the above)
The rate of doing work
Cell
Electromagnetic field

29. 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
Relay
75 Ohms
Cables
First digit

30. How many kinds of poles do magnets have?
Two
Bonding and grounding
DC flows continuously in one direction and AC potential difference and current both change direction
Parallel circuit

31. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Use an effect to produce another effect
Voltage
By their covering
A magnetic field

32. What information do the Left-Hand Rules provide?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Ohms
Secondary cell
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

33. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Does not move
Volts
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

34. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Porcelain
The relationship of potential difference to current
Plastic - Rubber - Friction(all of the above)
Alternating current

35. What are the common units of measurement for round and square conductor cross - sections?
Composition of the resistor
Grounding wire
Ohms
Circular and square mills(Both A and B)

36. 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
12 volts
Ability to store an electric charge
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
High resistance

37. What type of circuit has two or more paths for current to follow?
Insulation resistance
Parallel circuit
Magnetic properties
Electromagnetic field

38. What can permanently break down a capacitor?
Potential difference
Stranded
Breakdown voltage
Current flows in one direction - potential differences across a load does not change(Both A and B)

39. What do junction boxes protect?
Voltmeter
Wire splices
Heat
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

40. When does a DC circuit oppose current flow?
Two
Electrical resistance against the flow of current
Gauge number
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

41. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Symbol
First digit
Potential difference

42. What is another name for an inductor?
Choke
From the negative battery terminal to the positive terminal
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Moving vehicles

43. What determines the resistance of a resistor?
Composition of the resistor
A magnetic field
Cells can be connected together to make a battery
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

44. What cannot be transformed to higher or lower potential differences?
Cells can be connected together to make a battery
DC current
The relationship of potential difference to current
American wire gauge(AWG)

45. What is dielectric strength?
Current flows in one direction - potential differences across a load does not change(Both A and B)
First digit is 9
Plastic - Rubber - Friction(all of the above)
How much potential difference can a material withstand before breaking down

46. What determines whether a spark can be produced?
Bare - covered - insulated - stranded - cable(All of the above)
Strength of the charge
Silver
The direction the negative charge moves

47. What does a transformer transform?
The relationship of potential difference to current
How much potential difference can a material withstand before breaking down
Symbol
Insulation resistance and Dielectric strength(Both A and B)

48. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Resistance value can not be changed
The rate of doing work
Relationship between current and potential difference

49. Which material has the lowest resistance at ordinary temperatures?
Silver
1 watt
Purging
Current flows in one direction - potential differences across a load does not change(Both A and B)

50. How do you read resistor color codes?
Start with the band on the end and read to the center
Gauge number
Electromagnetism
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)