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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. Identify the general blueprint symbol for inductors.
Wire splices
Fixed - Electrolytic - Variable(all of the above)
Symbol
Circular and square mills(Both A and B)

2. What makes electrons flow?
Potential difference
Current change in a coil creates a magnetic change
The rate of doing work
Electromagnetism

3. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Fixed - tapped - variable(all of the above)
Mutual induction
By their covering
Resistance value can not be changed

4. What does a third band of brown mean?
1/1000th of an inch
10
Start with the band on the end and read to the center
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

5. How do you read resistor color codes?
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)
Composition of the resistor
Current flows in one direction - potential differences across a load does not change(Both A and B)
Start with the band on the end and read to the center

6. What is the unit of measurement of resistance?
Common - not rechargable - gradually discharges when in storage(All of the above)
Ohms
Composition of the resistor
Heat and current control(both a and c)

7. What makes electrons flow?
Opposes any change in the current flowing in a circuit
Produce heat - light - or limit current to control it(all of the above)
Start with the band on the end and read to the center
Potential difference

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

9. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(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)
Volts
Electromagnetic field

10. Why is the transformer important to AC electricity?

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11. What is an electromagnet?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Symbol
Insulation resistance

12. 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)
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)
Grounding wire
Voltmeter

13. What must be large enough to carry the largest current likely to occur?
Plastic - Rubber - Friction(all of the above)
Grounding wire
75 Ohms
Tolerence

14. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
1/1000th of an inch
1 watt
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

15. What type of circuit has one path of follow through a load?
Potential difference
Series circuit
Stores electrical charge
75 Ohms

16. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Secondary cell
Mutual induction
American wire gauge(AWG)

17. What is the unit of measurement of potential difference?
Potential difference
Volts
First digit
Breakdown voltage

18. What is needed for electric heating elements and the filaments of light bulbs?
A magnetic field
Amperes
Area and spacing of capacitor - static current in the capacitor(both A and B)
High resistance

19. What is a type of mechanical transducer?
Heat and current control(both a and c)
Heat
Solenoid and Relay(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction

20. When reading resistance color codes - what does the first band indicate?
Insulation resistance and Dielectric strength(Both A and B)
Battery
First digit
Electromagnetic field

21. What does resistance produce?
Opposition to electrical current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Insulation resistance and Dielectric strength(Both A and B)
Heat

22. What do we call the ability to do work?
Insulation resistance and Dielectric strength(Both A and B)
Heat
Alternating current
Energy

23. What is the term for doing work at the rate of joule per second?
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)
1 watt
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

24. What is resistance in electrical terms?
Electromagnetism
High resistance
Opposition to electrical current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

25. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Bare - covered - insulated - stranded - cable(All of the above)
Potential difference
5%

26. Which of the following materials is NOT a good conductor?
DC current
Cells can be connected together to make a battery
Wire splices
Porcelain

27. Where does the thumb point in both Left-Hand Rules?
Resistance increases as the conductor length increases
The direction the negative charge moves
50 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

28. To what measurement do the conductor mills refer?
First digit is 9
1/1000th of an inch
Volts
High resistance

29. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Two
A magnetic field
Opposes any change in the current flowing in a circuit

30. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Electromagnetic field
Purging
Parallel circuit
10

31. What does static electricity do?
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)
Chemical action
Does not move
Gauge number

32. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Composition of the resistor
Heat and current control(both a and c)
Produce heat - light - or limit current to control it(all of the above)

33. What is the use of the electromagnet?
Ability to store an electric charge
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Two
Common - not rechargable - gradually discharges when in storage(All of the above)

34. What results when current is run through a material with high resistance?
Silver
Volts
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Heat and current control(both a and c)

35. What information do the Left-Hand Rules provide?
A magnetic field
Does not move
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Bonding and grounding

36. What is a type of capacitor?
Insulation resistance
Serial
Fixed - Electrolytic - Variable(all of the above)
The direction the negative charge moves

37. What is induction?
Voltmeter
Current change in a coil creates a magnetic change
Secondary cell
Electromagnetic field

38. What is the basic law of magnetic force?
Unlike poles attract
First digit is 9
Serial
Grounding wire

39. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
--^V^V^V^---
A difference in potential energy
The direction the negative charge moves
10%

40. What is true about a dry cell?
Bare - covered - insulated - stranded - cable(All of the above)
Battery
Common - not rechargable - gradually discharges when in storage(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)

41. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Purging
Opposition to movement of free electrons
Heat and current control(both a and c)

42. When does a DC circuit oppose current flow?
Ohms
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
10%
Bare - covered - insulated - stranded - cable(All of the above)

43. Where do the fingers point in both Left-Hand Rules?
A magnetic field
15 -000 ohms - 20%
First digit
The direction of the magnetic field

44. Which material has the lowest resistance at ordinary temperatures?
Ability to store an electric charge
Moving vehicles
Silver
1/1000th of an inch

45. What is the purpose of capacitors in electrical circuits?
Electrical resistance against the flow of current
Strength of the charge
Stores electrical charge
Two

46. What determines the resistance of a resistor?
Resistance increases as the conductor length increases
Unlike poles attract
20%
Composition of the resistor

47. What is an arrangement of materials that create a potential difference by chemistry?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Cell
Composition of the resistor
10%

48. Which type of cell can be recharged?
Alternating current
Serial
Secondary cell
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

49. What is resistance?
Battery
12 volts
Current change in a coil creates a magnetic change
Opposition to movement of free electrons

50. What is the purpose of resistors in electrical circuits?
Wire splices
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
10%
Produce heat - light - or limit current to control it(all of the above)