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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 purpose of capacitors in electrical circuits?
Energy
Stores electrical charge
Relationship between current and potential difference
Cells can be connected together to make a battery

2. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
1/1000th of an inch
75 Ohms
Moving vehicles

3. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
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)
Does not move
10

4. What is the type of cable composed of many fine wires?
20%
Fixed - tapped - variable(all of the above)
Stranded
Parallel circuit

5. How is capacitance determined?
Bonding and grounding
Electromagnetism
A difference in potential energy
Area and spacing of capacitor - static current in the capacitor(both A and B)

6. Identify the blueprint symbol for capacitors.
Circular and square mills(Both A and B)
DC current
Fixed - tapped - variable(all of the above)
Symbol

7. What is a way to classify wires and cables?
Symbol
By their covering
Opposition to electrical current
Current flows in one direction - potential differences across a load does not change(Both A and B)

8. What makes electrons flow?
Gauge number
Potential difference
Voltmeter
Bare - covered - insulated - stranded - cable(All of the above)

9. What information do the Left-Hand Rules provide?
A magnetic field
Two
DC flows continuously in one direction and AC potential difference and current both change direction
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

10. What is a rigid metal conduit?
Resistance value can not be changed
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Silver
Ohms

11. What is a conductor?
Stores electrical charge
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)
Electromagnetism

12. What does a moving charge produce?
Chemical action
A magnetic field
The relationship of potential difference to current
Circular and square mills(Both A and B)

13. Where does the thumb point in both Left-Hand Rules?
Gauge number
Composition of the resistor
The direction the negative charge moves
Potential difference

14. The thermocouple uses which method for creating potential energy?
High resistance
Energy
Heat
Fixed - tapped - variable(all of the above)

15. What is a wire classification?
Opposition to movement of free electrons
Current flows in one direction - potential differences across a load does not change(Both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Fixed - tapped - variable(all of the above)

16. What is the unit of measurement of electrical current?
Choke
Amperes
Opposition to electrical current
20%

17. What is true about a dry cell?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)
Mutual induction
Cells can be connected together to make a battery

18. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to movement of free electrons
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
50 Ohms

19. Which type of cell can be recharged?
Secondary cell
How much potential difference can a material withstand before breaking down
Electromagnetic field
Resistance value can not be changed

20. What is the unit of measurement of potential difference?
Does not move
Magnetic properties
Volts
Electromagnetism

21. Where do the fingers point in both Left-Hand Rules?
Volts
The direction of the magnetic field
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)
Potential difference

22. What determines the resistance of a resistor?
Does not move
Relationship between current and potential difference
Composition of the resistor
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

23. What does Ohm's Law represent?
Plastic - Rubber - Friction(all of the above)
Stranded
First digit
Relationship between current and potential difference

24. What do we call the ability to do work?
--^V^V^V^---
12 volts
Energy
Battery

25. What cannot be transformed to higher or lower potential differences?
Choke
DC current
Does not move
Electromagnetism

26. What wire measurement is commonly used in the U.S.?
Parallel circuit
Circular and square mills(Both A and B)
American wire gauge(AWG)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

27. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Resistance increases as the conductor length increases
Energy
The direction of the magnetic field

28. What is dielectric strength?
Opposition to movement of free electrons
20%
Wire splices
How much potential difference can a material withstand before breaking down

29. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
10%

30. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Does not move
Electrical resistance against the flow of current
Use an effect to produce another effect

31. What is the relationship between cells and batteries?
Opposition to electrical current
Potential difference - E*I - current times current change from point to point(all of the above)
Cells can be connected together to make a battery
Mutual induction

32. Which material has the lowest resistance at ordinary temperatures?
Amperes
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
From the negative battery terminal to the positive terminal
Silver

33. What is the name for electrical resistance of insulation?
Bonding and grounding
Insulation resistance
Plastic - Rubber - Friction(all of the above)
Ability to store an electric charge

34. What does a first band of white mean?
Cells can be connected together to make a battery
Mutual induction
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)
First digit is 9

35. Why is the transformer important to AC electricity?

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36. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Insulation resistance and Dielectric strength(Both A and B)
How much potential difference can a material withstand before breaking down
Resistance value can not be changed

37. What does resistance produce?
Two
Parallel
10
Heat

38. When reading resistance color codes - what does the fourth band indicate?
Composition of the resistor
Volts
Tolerence
Two

39. The dry cell is what method for creating potential energy?
Chemical action
Stores electrical charge
American wire gauge(AWG)
Does not move

40. What does static electricity do?
Does not move
By their covering
1/1000th of an inch
Volts

41. What is a characteristic of insulators?
Mutual induction
Series circuit
Voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

42. To what measurement do the conductor mills refer?
Plastic - Rubber - Friction(all of the above)
Start with the band on the end and read to the center
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
1/1000th of an inch

43. How do static charges distribute themselves?
Plastic - Rubber - Friction(all of the above)
Potential difference
Opposition to electrical current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

44. Identify the general blueprint symbol for inductors.
Symbol
Current change in a coil creates a magnetic change
Volts
Mutual induction

45. What is a common form used in conductors?
Cables
Electromagnetism
Electromagnetic field
Voltage

46. What does a third band of brown mean?
Insulation resistance and Dielectric strength(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
10

47. What is an arrangement of materials that create a potential difference by chemistry?
Cell
The relationship of potential difference to current
Cables
Stranded

48. What is capacitance in electrical terms?
Electromagnetic field
Ability to store an electric charge
Fixed - tapped - variable(all of the above)
Secondary cell

49. What is the unit of measurement of resistance?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Porcelain
Amperes
Ohms

50. What is a DC circuit characteristic?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Circular and square mills(Both A and B)
50 Ohms
Current flows in one direction - potential differences across a load does not change(Both A and B)

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Basic Electricity

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