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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 characteristic of insulators?
Silver
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
American wire gauge(AWG)
Does not move

2. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Battery
DC current
Mutual induction

3. How many kinds of poles do magnets have?
Two
Potential difference
The rate of doing work
Parallel circuit

4. What wire measurement is commonly used in the U.S.?
Heat
American wire gauge(AWG)
Potential difference - E*I - current times current change from point to point(all of the above)
Unlike poles attract

5. To what measurement do the conductor mills refer?
Parallel circuit
15 -000 ohms - 20%
1/1000th of an inch
75 Ohms

6. What does an object have if a magnetic field acts on it?
Grounding wire
Moving vehicles
Magnetic properties
Bonding and grounding

7. What is the purpose of resistors in electrical circuits?
Grounding wire
Produce heat - light - or limit current to control it(all of the above)
Series circuit
Plastic - Rubber - Friction(all of the above)

8. 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
Secondary cell
75 Ohms
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
DC current

9. What cannot be transformed to higher or lower potential differences?
Symbol
Volts
DC current
Opposition to electrical current

10. In most applications - what remains constant if the current remains constant and flows in one direction?
--^V^V^V^---
Silver
Electromagnetic field
Composition of the resistor

11. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
DC current
Voltmeter
Parallel

12. A resistor is color coded brown - green - orange. What is its resistance?
Cells can be connected together to make a battery
American wire gauge(AWG)
High resistance
15 -000 ohms - 20%

13. The dry cell is what method for creating potential energy?
Electrical resistance against the flow of current
Opposition to electrical current
Chemical action
Mutual induction

14. 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)
Cables
1/1000th of an inch
Gauge number

15. What is induction?
Current change in a coil creates a magnetic change
Opposes any change in the current flowing in a circuit
Gauge number
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

16. What is the basic law of magnetic force?
Plastic - Rubber - Friction(all of the above)
Heat and current control(both a and c)
Two
Unlike poles attract

17. What is a common cause of static electricity in a shop?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
First digit
Moving vehicles
Porcelain

18. What is the fundamental property of insulators?
50 Ohms
Insulation resistance and Dielectric strength(Both A and B)
Battery
Plastic - Rubber - Friction(all of the above)

19. What is the term for two or more cells attached together?
5%
Two
Battery
Opposes any change in the current flowing in a circuit

20. Where do the fingers point in both Left-Hand Rules?
Opposition to movement of free electrons
Gauge number
Moving vehicles
The direction of the magnetic field

21. What are the names of two of the six primary methods of producing a voltage?
Unlike poles attract
75 Ohms
1 watt
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

22. What does a third band of brown mean?
10
Start with the band on the end and read to the center
Battery
Electrical resistance against the flow of current

23. What is a common form used in conductors?
Stranded
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cables
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

24. What types of protective tapes are used?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Choke
10%
Plastic - Rubber - Friction(all of the above)

25. How do you read resistor color codes?
Symbol
Start with the band on the end and read to the center
Volts
The rate of doing work

26. What makes electrons flow?
Porcelain
Stores electrical charge
Potential difference
Parallel circuit

27. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
10
Bonding and grounding
By their covering
Alternating current

28. What does Ohm's Law represent?
A magnetic field
Relationship between current and potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)

29. What is the name for electrical resistance of insulation?
Insulation resistance
15 -000 ohms - 20%
Symbol
10

30. What is power?
Heat and current control(both a and c)
12 volts
The rate of doing work
Circular and square mills(Both A and B)

31. What is a DC circuit characteristic?
Electromagnetism
Current flows in one direction - potential differences across a load does not change(Both A and B)
10%
Current change in a coil creates a magnetic change

32. What is the relationship of conductor size and length to resistance?
Choke
5%
Produce heat - light - or limit current to control it(all of the above)
Resistance increases as the conductor length increases

33. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
High resistance
DC current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

34. Where does the thumb point in both Left-Hand Rules?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The direction the negative charge moves
Relay
Opposition to movement of free electrons

35. What does a transformer transform?
Cell
The relationship of potential difference to current
The direction of the magnetic field
20%

36. What is a type of mechanical transducer?
50 Ohms
Solenoid and Relay(both A and B)
Electrical resistance against the flow of current
Porcelain

37. 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
Does not move
DC current
Use an effect to produce another effect

38. What results when current is run through a material with high resistance?
Bare - covered - insulated - stranded - cable(All of the above)
Heat and current control(both a and c)
Current flows in one direction - potential differences across a load does not change(Both A and B)
10

39. The generator is what method of creating potential energy?
Insulation resistance and Dielectric strength(Both A and B)
Battery
Electromagnetism
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

40. What are the common units of measurement for round and square conductor cross - sections?
The direction the negative charge moves
Circular and square mills(Both A and B)
American wire gauge(AWG)
Ohms

41. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Wire splices
Does not move
Parallel
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

42. What is a common measure of wire diameter?
Gauge number
15 -000 ohms - 20%
Start with the band on the end and read to the center
Bonding and grounding

43. What is an arrangement of materials that create a potential difference by chemistry?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
1/1000th of an inch
Moving vehicles
Cell

44. What is the relationship between cells and batteries?
Mutual induction
Amperes
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Cells can be connected together to make a battery

45. What is the relationship between magnetism and electricity?
Battery
Porcelain
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)
5%

46. What can permanently break down a capacitor?
Breakdown voltage
Series circuit
Serial
Stranded

47. When reading resistance color codes - what does the fourth band indicate?
Moving vehicles
Potential difference
Electromagnetism
Tolerence

48. How do static charges distribute themselves?
Relay
Electromagnetism
Parallel
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

49. What is the term for doing work at the rate of joule per second?
1 watt
Tolerence
Current flows in one direction - potential differences across a load does not change(Both A and B)
Solenoid and Relay(both A and B)

50. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Start with the band on the end and read to the center
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Magnetic properties