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 type of circuit has one path of follow through a load?
First digit
Bare - covered - insulated - stranded - cable(All of the above)
Cables
Series circuit

2. The dry cell is what method for creating potential energy?
Chemical action
1/1000th of an inch
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction of the magnetic field

3. What does a transformer transform?
Relationship between current and potential difference
Strength of the charge
Serial
The relationship of potential difference to current

4. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Relationship between current and potential difference
How much potential difference can a material withstand before breaking down
Voltage

5. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Stranded
5%
American wire gauge(AWG)
Voltage

6. How do static charges distribute themselves?
Electromagnetic field
Bare - covered - insulated - stranded - cable(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

7. What does a first band of white mean?
Alternating current
Cells can be connected together to make a battery
Electromagnetism
First digit is 9

8. What do we call the ability to do work?
Electromagnetism
Opposition to movement of free electrons
Cell
Energy

9. What is the use of the electromagnet?
10
1 watt
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Heat

10. What is a conductor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
DC current
Breakdown voltage
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

11. How many kinds of poles do magnets have?
1 watt
Parallel circuit
Two
Parallel

12. What must be large enough to carry the largest current likely to occur?
Grounding wire
Insulation resistance
Fixed - tapped - variable(all of the above)
Opposition to movement of free electrons

13. What is the term for two or more cells attached together?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to electrical current
1 watt
Battery

14. In most applications - what remains constant if the current remains constant and flows in one direction?
1/1000th of an inch
Electromagnetic field
Chemical action
Wire splices

15. What do junction boxes protect?
The direction the negative charge moves
Wire splices
Stranded
Unlike poles attract

16. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Parallel
Lifting devices - chucks and clutches - brakes and pulleys(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)

17. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Grounding wire
Silver
How much potential difference can a material withstand before breaking down
Alternating current

18. How do you read resistor color codes?
Start with the band on the end and read to the center
Energy
Produce heat - light - or limit current to control it(all of the above)
Battery

19. What is a common cause of static electricity in a shop?
Volts
5%
From the negative battery terminal to the positive terminal
Moving vehicles

20. What is the unit of measurement of potential difference?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts
Grounding wire
Battery

21. What types of protective tapes are used?
Circular and square mills(Both A and B)
Plastic - Rubber - Friction(all of the above)
How much potential difference can a material withstand before breaking down
Ability to store an electric charge

22. What is a common form used in conductors?
Cables
Ohms
Cells can be connected together to make a battery
20%

23. What is capacitance in electrical terms?
Ability to store an electric charge
Fixed - Electrolytic - Variable(all of the above)
Electrical resistance against the flow of current
Parallel circuit

24. Which way is the current going in the circuit shown?(electron flow)
Resistance increases as the conductor length increases
Symbol
Resistance value can not be changed
From the negative battery terminal to the positive terminal

25. Identify the blueprint symbol for capacitors.
20%
Insulation resistance
Symbol
Heat

26. Which type of cell can be recharged?
Circular and square mills(Both A and B)
Secondary cell
How much potential difference can a material withstand before breaking down
Unlike poles attract

27. What information do the Left-Hand Rules provide?
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)
10%

28. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Strength of the charge
High resistance
The relationship of potential difference to current

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
Battery
75 Ohms
Opposes any change in the current flowing in a circuit
American wire gauge(AWG)

30. What is another name for an inductor?
Stores electrical charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Choke
Solenoid and Relay(both A and B)

31. When reading resistance color codes - what does the first band indicate?
10%
First digit
Heat
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

32. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Tolerence
First digit is 9

33. 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)
1 watt
Magnetic properties
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

34. Which material has the lowest resistance at ordinary temperatures?
20%
Series circuit
Silver
Resistance value can not be changed

35. What is voltage?
A difference in potential energy
Mutual induction
Voltmeter
Bare - covered - insulated - stranded - cable(All of the above)

36. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Strength of the charge
10%
Choke

37. What is the measure of potential difference?
DC flows continuously in one direction and AC potential difference and current both change direction
Volts
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Cables

38. When reading resistance color codes - what does the fourth band indicate?
Does not move
A difference in potential energy
Tolerence
10%

39. 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
10
Opposes any change in the current flowing in a circuit
12 volts
Volts

40. What can permanently break down a capacitor?
Breakdown voltage
10%
Purging
Unlike poles attract

41. What is the fundamental property of insulators?
Does not move
Insulation resistance and Dielectric strength(Both A and B)
Potential difference
First digit

42. Which of the following materials is NOT a good conductor?
High resistance
Ohms
5%
Porcelain

43. What is the term for doing work at the rate of joule per second?
1 watt
Ohms
Solenoid and Relay(both A and B)
Parallel

44. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
DC flows continuously in one direction and AC potential difference and current both change direction
High resistance
Symbol

45. What is a DC circuit characteristic?
Magnetic properties
American wire gauge(AWG)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance

46. 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)
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to movement of free electrons

47. What results when current is run through a material with high resistance?
Potential difference
Purging
Heat and current control(both a and c)
Volts

48. What is an electromagnet?
15 -000 ohms - 20%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Chemical action
Insulation resistance and Dielectric strength(Both A and B)

49. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to movement of free electrons
Plastic - Rubber - Friction(all of the above)

50. What cannot be transformed to higher or lower potential differences?
DC current
50 Ohms
Volts
Heat and current control(both a and c)