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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 the use of the electromagnet?
Does not move
American wire gauge(AWG)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Circular and square mills(Both A and B)

2. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Relationship between current and potential difference
Current change in a coil creates a magnetic change

3. What instrument measures voltage?
Cables
Voltmeter
Unlike poles attract
The rate of doing work

4. What is the name for electrical resistance of insulation?
1 watt
Cells can be connected together to make a battery
Insulation resistance
Grounding wire

5. 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
Unlike poles attract
Symbol
75 Ohms
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)

6. The dry cell is what method for creating potential energy?
Cells can be connected together to make a battery
Cables
Chemical action
Heat

7. What is resistance in electrical terms?
Opposition to electrical current
High resistance
Electrical resistance against the flow of current
Bare - covered - insulated - stranded - cable(All of the above)

8. What is power?
The rate of doing work
Alternating current
Parallel circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

9. What does a third band of brown mean?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Heat
10

10. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The rate of doing work
Ohms

11. What do junction boxes protect?
Wire splices
The direction the negative charge moves
Alternating current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

12. What is a common measure of wire diameter?
The direction of the magnetic field
American wire gauge(AWG)
Common - not rechargable - gradually discharges when in storage(All of the above)
Gauge number

13. What type of circuit has two or more paths for current to follow?
Parallel circuit
Battery
Plastic - Rubber - Friction(all of the above)
Stranded

14. What are the common units of measurement for round and square conductor cross - sections?
It increases or decreases the potential difference of AC electricity - It is effective with almost no loss of power - It's use- cost is very low(All of the above)
Cell
Circular and square mills(Both A and B)
Heat and current control(both a and c)

15. 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)
Insulation resistance
5%
DC flows continuously in one direction and AC potential difference and current both change direction

16. What is a property of inductors in electrical circuits?
Heat
American wire gauge(AWG)
Opposes any change in the current flowing in a circuit
Alternating current

17. What is another name for an inductor?
A difference in potential energy
Choke
Purging
5%

18. Which type of cell can be recharged?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Secondary cell
Current flows in one direction - potential differences across a load does not change(Both A and B)
Chemical action

19. 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
10
Cell
Bonding and grounding

20. Why is the transformer important to AC electricity?

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21. What is a DC circuit characteristic?
Current change in a coil creates a magnetic change
Heat
Magnetic properties
Current flows in one direction - potential differences across a load does not change(Both A and B)

22. The thermocouple uses which method for creating potential energy?
Voltmeter
Heat
Symbol
DC flows continuously in one direction and AC potential difference and current both change direction

23. Identify the general blueprint symbol for inductors.
Amperes
Purging
Stranded
Symbol

24. What are the two generic methods to eliminate static electricity from metal objects?
10
From the negative battery terminal to the positive terminal
Bonding and grounding
Ohms

25. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Mutual induction
Potential difference
Energy

26. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Series circuit
Produce heat - light - or limit current to control it(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

27. What does static electricity do?
A magnetic field
Insulation resistance
Does not move
The rate of doing work

28. What is a characteristic of a fixed resistor?
Start with the band on the end and read to the center
Serial
Resistance value can not be changed
The relationship of potential difference to current

29. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Current flows in one direction - potential differences across a load does not change(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference
50 Ohms

30. How many kinds of poles do magnets have?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
1 watt
Strength of the charge
Two

31. What is a switch that operates by electricity?
Opposition to electrical current
First digit is 9
DC flows continuously in one direction and AC potential difference and current both change direction
Relay

32. Identify the blueprint symbol for capacitors.
Silver
Stores electrical charge
Parallel
Symbol

33. Where does the thumb point in both Left-Hand Rules?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
First digit
The direction the negative charge moves
--^V^V^V^---

34. What type of circuit has one path of follow through a load?
Voltmeter
Insulation resistance
Series circuit
Produce heat - light - or limit current to control it(all of the above)

35. What types of protective tapes are used?
DC flows continuously in one direction and AC potential difference and current both change direction
20%
Chemical action
Plastic - Rubber - Friction(all of the above)

36. What does resistance produce?
Heat
Ability to store an electric charge
Insulation resistance and Dielectric strength(Both A and B)
Purging

37. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Breakdown voltage
The direction of the magnetic field
Heat and current control(both a and c)
Mutual induction

38. What is the purpose of resistors in electrical circuits?
Relay
Produce heat - light - or limit current to control it(all of the above)
From the negative battery terminal to the positive terminal
Cell

39. What is the unit of measurement of resistance?
15 -000 ohms - 20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Ohms
Relay

40. What is a common form used in conductors?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Cables
--^V^V^V^---
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

41. What makes electrons flow?
Opposes any change in the current flowing in a circuit
First digit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Potential difference

42. Which of the following is a type of resistor?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
By their covering
Fixed - tapped - variable(all of the above)
Insulation resistance

43. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Serial
Ability to store an electric charge
10%
Unlike poles attract

44. What do we call the ability to do work?
Fixed - Electrolytic - Variable(all of the above)
Energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Resistance increases as the conductor length increases

45. When reading resistance color codes - what does the first band indicate?
Start with the band on the end and read to the center
Cell
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

46. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Bare - covered - insulated - stranded - cable(All of the above)
By their covering
Wire splices
Purging

47. Where do the fingers point in both Left-Hand Rules?
Serial
The direction of the magnetic field
Symbol
It increases or decreases the potential difference of AC electricity - It is effective with almost no loss of power - It's use- cost is very low(All of the above)

48. What is voltage?
A difference in potential energy
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Volts
Start with the band on the end and read to the center

49. What is a way to classify wires and cables?
Start with the band on the end and read to the center
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
From the negative battery terminal to the positive terminal
By their covering

50. How do you read resistor color codes?
Potential difference - E*I - current times current change from point to point(all of the above)
Start with the band on the end and read to the center
Moving vehicles
Energy

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Basic Electricity

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