Test your basic knowledge |

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 characteristic of insulators?
Battery
Resistance value can not be changed
15 -000 ohms - 20%
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

2. Which of the following materials is NOT a good conductor?
Porcelain
Magnetic properties
Start with the band on the end and read to the center
Cell

3. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Electromagnetism
DC current
Potential difference

4. Identify the general blueprint symbol for inductors.
Porcelain
Symbol
Chemical action
The rate of doing work

5. What does resistance produce?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference
5%
Heat

6. What results when current is run through a material with high resistance?
Wire splices
Heat and current control(both a and c)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Amperes

7. What type of circuit has one path of follow through a load?
Electromagnetic field
Series circuit
Ability to store an electric charge
Resistance value can not be changed

8. What is voltage?
The relationship of potential difference to current
Electromagnetism
A difference in potential energy
Solenoid and Relay(both A and B)

9. What type of circuit has two or more paths for current to follow?
DC flows continuously in one direction and AC potential difference and current both change direction
Cables
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel circuit

10. What does an object have if a magnetic field acts on it?
Battery
Magnetic properties
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke

11. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
The direction the negative charge moves
Heat
Grounding wire

12. What is the relationship between magnetism and electricity?
Start with the band on the end and read to the center
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)
Cells can be connected together to make a battery
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

13. What is a common form used in conductors?
Opposition to movement of free electrons
Relay
Gauge number
Cables

14. What is the fundamental property of insulators?
75 Ohms
10%
Insulation resistance and Dielectric strength(Both A and B)
Relationship between current and potential difference

15. What is a DC circuit characteristic?
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
Cells can be connected together to make a battery
Silver

16. What must be large enough to carry the largest current likely to occur?
Grounding wire
Electromagnetism
Potential difference
Silver

17. What is resistance?
Insulation resistance and Dielectric strength(Both A and B)
Electrical resistance against the flow of current
Porcelain
Opposition to movement of free electrons

18. What is the term for two or more cells attached together?
10
High resistance
Electrical resistance against the flow of current
Battery

19. What is power?
Voltage
Stores electrical charge
Stranded
The rate of doing work

20. What determines whether a spark can be produced?
How much potential difference can a material withstand before breaking down
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Strength of the charge

21. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance increases as the conductor length increases
Magnetic properties
High resistance

22. What is needed for electric heating elements and the filaments of light bulbs?
Volts
Volts
High resistance
Mutual induction

23. What is another name for an inductor?
Unlike poles attract
Choke
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)

24. What information do the Left-Hand Rules provide?
50 Ohms
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Ohms
15 -000 ohms - 20%

25. What do we call the ability to do work?
Cells can be connected together to make a battery
15 -000 ohms - 20%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy

26. Which of the following is a type of resistor?
Moving vehicles
Fixed - tapped - variable(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltmeter

27. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Strength of the charge
Silver
Purging

28. What is dielectric strength?
Volts
How much potential difference can a material withstand before breaking down
Insulation resistance and Dielectric strength(Both A and B)
Symbol

29. What does a moving charge produce?
A magnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
10%
Volts

30. What is a way to classify wires and cables?
First digit
By their covering
Current flows in one direction - potential differences across a load does not change(Both A and B)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

31. What makes electrons flow?
Strength of the charge
Potential difference
DC current
Plastic - Rubber - Friction(all of the above)

32. What are the two generic methods to eliminate static electricity from metal objects?
Porcelain
12 volts
Bonding and grounding
Start with the band on the end and read to the center

33. What is a rigid metal conduit?
Tolerence
Resistance increases as the conductor length increases
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
From the negative battery terminal to the positive terminal

34. What is a conductor?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Voltmeter
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

35. What is the purpose of resistors in electrical circuits?
First digit is 9
Purging
Produce heat - light - or limit current to control it(all of the above)
Voltage

36. What cannot be transformed to higher or lower potential differences?
Heat
Relay
DC current
Volts

37. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Cell
Heat and current control(both a and c)
50 Ohms
Potential difference

38. What is the measure of potential difference?
Electromagnetic field
Volts
Wire splices
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

39. The generator is what method of creating potential energy?
Ability to store an electric charge
Electromagnetism
A difference in potential energy
20%

40. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
A magnetic field
Tolerence
Mutual induction

41. When reading resistance color codes - what does the first band indicate?
Opposition to movement of free electrons
Area and spacing of capacitor - static current in the capacitor(both A and B)
First digit
Fixed - tapped - variable(all of the above)

42. How many kinds of poles do magnets have?
Relationship between current and potential difference
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Two
Current change in a coil creates a magnetic change

43. How do you read resistor color codes?
Electromagnetism
Heat
Start with the band on the end and read to the center
Voltmeter

44. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Stores electrical charge
Tolerence
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

45. What is a common cause of static electricity in a shop?
Breakdown voltage
The relationship of potential difference to current
Moving vehicles
Bonding and grounding

46. What is the relationship between cells and batteries?
A difference in potential energy
Cells can be connected together to make a battery
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Circular and square mills(Both A and B)

47. 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
Opposes any change in the current flowing in a circuit
12 volts
A magnetic field
Potential difference

48. What is the type of cable composed of many fine wires?
Stranded
Battery
A magnetic field
--^V^V^V^---

49. What can permanently break down a capacitor?
Electrical resistance against the flow of current
Breakdown voltage
Energy
How much potential difference can a material withstand before breaking down

50. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
20%
Ohms
Wire splices