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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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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. Identify the general blueprint symbol for inductors.
Symbol
Composition of the resistor
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)
10%

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
Potential difference
Solenoid and Relay(both A and B)
Strength of the charge

3. What does a moving charge produce?
Choke
75 Ohms
5%
A magnetic field

4. Which material has the lowest resistance at ordinary temperatures?
Potential difference - E*I - current times current change from point to point(all of the above)
Silver
Bare - covered - insulated - stranded - cable(All of the above)
Insulation resistance and Dielectric strength(Both A and B)

5. What is capacitance in electrical terms?
DC flows continuously in one direction and AC potential difference and current both change direction
Magnetic properties
Potential difference - E*I - current times current change from point to point(all of the above)
Ability to store an electric charge

6. What is an arrangement of materials that create a potential difference by chemistry?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Current flows in one direction - potential differences across a load does not change(Both A and B)
Cell
Opposition to electrical current

7. What do we call the ability to do work?
15 -000 ohms - 20%
5%
Grounding wire
Energy

8. What is another name for an inductor?
Choke
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction of the magnetic field
Tolerence

9. What is a common cause of static electricity in a shop?
Gauge number
Heat and current control(both a and c)
Moving vehicles
Electrical resistance against the flow of current

10. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Fixed - tapped - variable(all of the above)
Purging
Stranded

11. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Cells can be connected together to make a battery
Series circuit
DC flows continuously in one direction and AC potential difference and current both change direction

12. When reading resistance color codes - what does the fourth band indicate?
10
Tolerence
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding

13. What makes electrons flow?
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)
10
High resistance
Potential difference

14. What type of circuit has two or more paths for current to follow?
Voltmeter
Battery
Solenoid and Relay(both A and B)
Parallel circuit

15. What is needed for electric heating elements and the filaments of light bulbs?
Fixed - tapped - variable(all of the above)
American wire gauge(AWG)
High resistance
Opposes any change in the current flowing in a circuit

16. How is the heat production measured in a resistor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Bonding and grounding
Potential difference - E*I - current times current change from point to point(all of the above)
Energy

17. Why is the transformer important to AC electricity?
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)
Fixed - tapped - variable(all of the above)
Relay
Bare - covered - insulated - stranded - cable(All of the above)

18. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Insulation resistance
20%
Electromagnetic field
Cell

19. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
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)
The rate of doing work
Alternating current
Choke

20. Which type of cell can be recharged?
DC flows continuously in one direction and AC potential difference and current both change direction
Secondary cell
Voltage
Cells can be connected together to make a battery

21. What is a common measure of wire diameter?
Ohms
Gauge number
First digit is 9
Secondary cell

22. What is a conductor?
Secondary cell
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
American wire gauge(AWG)
Parallel

23. What wire measurement is commonly used in the U.S.?
50 Ohms
American wire gauge(AWG)
Two
Breakdown voltage

24. What is the unit of measurement of resistance?
Ohms
Insulation resistance
1/1000th of an inch
Battery

25. What is the type of cable composed of many fine wires?
Ability to store an electric charge
Stranded
Plastic - Rubber - Friction(all of the above)
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)

26. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Symbol
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposition to electrical current

27. What is a characteristic of a fixed resistor?
Stranded
Chemical action
Resistance value can not be changed
Volts

28. What is power?
Two
DC flows continuously in one direction and AC potential difference and current both change direction
Symbol
The rate of doing work

29. What do junction boxes protect?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Solenoid and Relay(both A and B)
Wire splices
Circular and square mills(Both A and B)

30. Which of the following materials is NOT a good conductor?
Resistance increases as the conductor length increases
Current flows in one direction - potential differences across a load does not change(Both A and B)
Porcelain
Produce heat - light - or limit current to control it(all of the above)

31. What is a property of inductors in electrical circuits?
Potential difference
Choke
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Opposes any change in the current flowing in a circuit

32. The generator is what method of creating potential energy?
Electromagnetic field
Symbol
Heat
Electromagnetism

33. What does a transformer transform?
The relationship of potential difference to current
Voltage
Opposition to electrical current
Heat and current control(both a and c)

34. What is dielectric strength?
Potential difference - E*I - current times current change from point to point(all of the above)
75 Ohms
How much potential difference can a material withstand before breaking down
Resistance increases as the conductor length increases

35. The dry cell is what method for creating potential energy?
Cables
Heat and current control(both a and c)
5%
Chemical action

36. What is a switch that operates by electricity?
Relay
Parallel
Secondary cell
Magnetic properties

37. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Moving vehicles
Electromagnetic field
Volts

38. What instrument measures voltage?
Voltmeter
Opposition to electrical current
75 Ohms
Insulation resistance and Dielectric strength(Both A and B)

39. What are the common units of measurement for round and square conductor cross - sections?
Electromagnetic field
--^V^V^V^---
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Circular and square mills(Both A and B)

40. What can permanently break down a capacitor?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Mutual induction
Breakdown voltage
Heat and current control(both a and c)

41. What does a third band of brown mean?
Fixed - Electrolytic - Variable(all of the above)
20%
Use an effect to produce another effect
10

42. What is the unit of measurement of potential difference?
Insulation resistance
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to movement of free electrons
Volts

43. What is a common form used in conductors?
Cables
Stores electrical charge
Opposition to movement of free electrons
Ohms

44. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)
The direction the negative charge moves

45. What is true about a dry cell?
Voltmeter
Electromagnetic field
A difference in potential energy
Common - not rechargable - gradually discharges when in storage(All of the above)

46. How do you read resistor color codes?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
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)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Start with the band on the end and read to the center

47. What is voltage?
DC flows continuously in one direction and AC potential difference and current both change direction
20%
A difference in potential energy
75 Ohms

48. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Common - not rechargable - gradually discharges when in storage(All of the above)
High resistance
Grounding wire

49. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Gauge number
Current flows in one direction - potential differences across a load does not change(Both A and B)
Moving vehicles

50. What is the relationship of conductor size and length to resistance?
Volts
Resistance increases as the conductor length increases
Fixed - tapped - variable(all of the above)
First digit

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