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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 needed for electric heating elements and the filaments of light bulbs?
Bonding and grounding
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
10%
High resistance

2. Which material has the lowest resistance at ordinary temperatures?
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)
Silver
Fixed - tapped - variable(all of the above)
Grounding wire

3. What is a common form used in conductors?
DC flows continuously in one direction and AC potential difference and current both change direction
Cables
Heat
Stranded

4. What is the unit of measurement of resistance?
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)
Volts
Ohms

5. What is voltage?
Produce heat - light - or limit current to control it(all of the above)
Grounding wire
Current change in a coil creates a magnetic change
A difference in potential energy

6. What cannot be transformed to higher or lower potential differences?
Opposes any change in the current flowing in a circuit
Cell
Symbol
DC current

7. What makes electrons flow?
First digit is 9
Parallel circuit
Potential difference
Electromagnetism

8. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
12 volts
A magnetic field
Purging
--^V^V^V^---

9. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Ohms
Breakdown voltage
Choke

10. To what measurement do the conductor mills refer?
1/1000th of an inch
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
A magnetic field
The rate of doing work

11. Where does the thumb point in both Left-Hand Rules?
Cell
High resistance
Volts
The direction the negative charge moves

12. 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
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Mutual induction
The direction of the magnetic field
75 Ohms

13. What is the use of the electromagnet?
Parallel circuit
Electromagnetic field
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposes any change in the current flowing in a circuit

14. What is an electromagnet?
Symbol
Current change in a coil creates a magnetic change
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

15. What are the two generic methods to eliminate static electricity from metal objects?
Cells can be connected together to make a battery
Voltmeter
Bonding and grounding
American wire gauge(AWG)

16. What type of circuit has one path of follow through a load?
Opposes any change in the current flowing in a circuit
Start with the band on the end and read to the center
Bare - covered - insulated - stranded - cable(All of the above)
Series circuit

17. What is the name for electrical resistance of insulation?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Voltmeter
Parallel circuit
Insulation resistance

18. What is a wire classification?
First digit is 9
Bare - covered - insulated - stranded - cable(All of the above)
Secondary cell
Chemical action

19. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Heat
Alternating current
Current flows in one direction - potential differences across a load does not change(Both A and B)
Opposes any change in the current flowing in a circuit

20. What is the purpose of capacitors in electrical circuits?
Electrical resistance against the flow of current
The direction of the magnetic field
Stores electrical charge
Does not move

21. What is the term for doing work at the rate of joule per second?
1 watt
Potential difference - E*I - current times current change from point to point(all of the above)
Parallel
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

22. When reading resistance color codes - what does the fourth band indicate?
Wire splices
Tolerence
Purging
American wire gauge(AWG)

23. What are the names of two of the six primary methods of producing a voltage?
Two
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Composition of the resistor
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

24. What is the type of cable composed of many fine wires?
75 Ohms
Wire splices
Stranded
10

25. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Breakdown voltage
Strength of the charge
15 -000 ohms - 20%

26. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Electromagnetic field
The direction of the magnetic field
Serial
Fixed - tapped - variable(all of the above)

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

28. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
10%
Cables
Stores electrical charge
50 Ohms

29. What do transducers do in electrical terms?
Potential difference
Use an effect to produce another effect
Relay
Symbol

30. What do electrical charges need to cause a fire or explosion?
Parallel
Voltage
Cables
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

31. How is the heat production measured in a resistor?
12 volts
Potential difference - E*I - current times current change from point to point(all of the above)
Symbol
Two

32. What results when current is run through a material with high resistance?
Start with the band on the end and read to the center
Heat and current control(both a and c)
Symbol
Alternating current

33. What is the relationship between magnetism and electricity?
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)
Heat
Resistance value can not be changed
Series circuit

34. What is a characteristic of insulators?
Heat
50 Ohms
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Ohms

35. What information do the Left-Hand Rules provide?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

36. What is a characteristic of a fixed resistor?
20%
Area and spacing of capacitor - static current in the capacitor(both A and B)
Resistance value can not be changed
Composition of the resistor

37. What is the fundamental property of insulators?
--^V^V^V^---
Resistance increases as the conductor length increases
Cables
Insulation resistance and Dielectric strength(Both A and B)

38. What is a common cause of static electricity in a shop?
Energy
Chemical action
Parallel
Moving vehicles

39. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Stores electrical charge
1/1000th of an inch
Symbol

40. What must be large enough to carry the largest current likely to occur?
Grounding wire
5%
Resistance increases as the conductor length increases
Purging

41. What is the unit of measurement of potential difference?
1 watt
Volts
Moving vehicles
First digit is 9

42. What makes electrons flow?
Voltmeter
Potential difference
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Voltage

43. What type of circuit has two or more paths for current to follow?
--^V^V^V^---
Parallel circuit
Stores electrical charge
Amperes

44. What is the relationship of conductor size and length to resistance?
The relationship of potential difference to current
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed
Resistance increases as the conductor length increases

45. What is the basic law of magnetic force?
1 watt
The rate of doing work
12 volts
Unlike poles attract

46. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
A magnetic field
Silver
20%

47. Which type of cell can be recharged?
15 -000 ohms - 20%
Secondary cell
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
--^V^V^V^---

48. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Mutual induction
DC flows continuously in one direction and AC potential difference and current both change direction
Use an effect to produce another effect

49. What is the term for two or more cells attached together?
Voltage
Porcelain
Cells can be connected together to make a battery
Battery

50. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Secondary cell
Electromagnetic field
10
Voltage