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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 unit of measurement of potential difference?
1 watt
Volts
Resistance increases as the conductor length increases
Plastic - Rubber - Friction(all of the above)

2. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
75 Ohms
Stranded
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

3. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
Solenoid and Relay(both A and B)
First digit is 9
Start with the band on the end and read to the center

4. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
A difference in potential energy
Solenoid and Relay(both A and B)
Potential difference

5. What do junction boxes protect?
Insulation resistance and Dielectric strength(Both A and B)
Wire splices
Potential difference
1 watt

6. What is the fundamental property of insulators?
First digit is 9
Insulation resistance and Dielectric strength(Both A and B)
First digit
Voltage

7. What are the two generic methods to eliminate static electricity from metal objects?
Cell
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding
Heat and current control(both a and c)

8. Identify the blueprint symbol for resistors.
--^V^V^V^---
The direction the negative charge moves
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Start with the band on the end and read to the center

9. How do you read resistor color codes?
First digit is 9
Ability to store an electric charge
Potential difference
Start with the band on the end and read to the center

10. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Opposition to electrical current
Amperes
Purging
Silver

11. What is needed for electric heating elements and the filaments of light bulbs?
Porcelain
High resistance
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)
Produce heat - light - or limit current to control it(all of the above)

12. What is a conductor?
Does not move
Composition of the resistor
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

13. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Electromagnetism
Two
Heat

14. What makes electrons flow?
Fixed - Electrolytic - Variable(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Potential difference
Opposition to movement of free electrons

15. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Resistance value can not be changed
Symbol
Purging

16. In most applications - what remains constant if the current remains constant and flows in one direction?
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)
Electromagnetic field
Grounding wire
By their covering

17. What does static electricity do?
Does not move
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Porcelain
Ability to store an electric charge

18. When reading resistance color codes - what does the first band indicate?
First digit
Mutual induction
Volts
Series circuit

19. Identify the general blueprint symbol for inductors.
Area and spacing of capacitor - static current in the capacitor(both A and B)
Opposition to movement of free electrons
Symbol
75 Ohms

20. What is voltage?
Volts
Secondary cell
A difference in potential energy
Mutual induction

21. 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
Current change in a coil creates a magnetic change
75 Ohms
Stores electrical charge
Does not move

22. What does a first band of white mean?
Heat
Grounding wire
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
First digit is 9

23. What is the basic law of magnetic force?
Unlike poles attract
Voltmeter
Cell
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

24. What makes electrons flow?
DC current
Potential difference
Gauge number
Magnetic properties

25. What information do the Left-Hand Rules provide?
Current change in a coil creates a magnetic change
Breakdown voltage
Grounding wire
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

26. How do static charges distribute themselves?
Plastic - Rubber - Friction(all of the above)
Circular and square mills(Both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The relationship of potential difference to current

27. To what measurement do the conductor mills refer?
The direction the negative charge moves
Grounding wire
Bare - covered - insulated - stranded - cable(All of the above)
1/1000th of an inch

28. The generator is what method of creating potential energy?
Electromagnetism
Heat
Electrical resistance against the flow of current
Opposition to electrical current

29. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Two
Bonding and grounding
75 Ohms

30. What is the name for electrical resistance of insulation?
Insulation resistance
Energy
First digit
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

31. A resistor is color coded brown - green - orange. What is its resistance?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Plastic - Rubber - Friction(all of the above)
A magnetic field
15 -000 ohms - 20%

32. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
From the negative battery terminal to the positive terminal
Two
5%

33. What are the names of two of the six primary methods of producing a voltage?
Circular and square mills(Both A and B)
Two
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Parallel circuit

34. What is the type of cable composed of many fine wires?
Stranded
Energy
Unlike poles attract
Fixed - Electrolytic - Variable(all of the above)

35. When reading resistance color codes - what does the fourth band indicate?
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)
Cables
Tolerence
Cell

36. What do we call the ability to do work?
Ability to store an electric charge
Energy
--^V^V^V^---
Choke

37. What do transducers do in electrical terms?
Relationship between current and potential difference
Unlike poles attract
Use an effect to produce another effect
Strength of the charge

38. The dry cell is what method for creating potential energy?
Start with the band on the end and read to the center
Chemical action
Volts
Energy

39. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Strength of the charge
Current change in a coil creates a magnetic change

40. What is the relationship of conductor size and length to resistance?
Energy
Produce heat - light - or limit current to control it(all of the above)
--^V^V^V^---
Resistance increases as the conductor length increases

41. What is the term for doing work at the rate of joule per second?
Serial
1 watt
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
First digit

42. What is the relationship between cells and batteries?
A magnetic field
Amperes
Cells can be connected together to make a battery
Electromagnetic field

43. What is an arrangement of materials that create a potential difference by chemistry?
Cell
50 Ohms
Energy
First digit is 9

44. What is a type of mechanical transducer?
Opposition to electrical current
Resistance increases as the conductor length increases
Solenoid and Relay(both A and B)
Ability to store an electric charge

45. What is the term for two or more cells attached together?
Battery
Current flows in one direction - potential differences across a load does not change(Both A and B)
Circular and square mills(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)

46. What is power?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
American wire gauge(AWG)
The rate of doing work
Purging

47. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Cell
Voltage
Secondary cell
Alternating current

48. What is resistance?
Opposition to movement of free electrons
A magnetic field
Resistance value can not be changed
Volts

49. What must be large enough to carry the largest current likely to occur?
10
Grounding wire
Symbol
Common - not rechargable - gradually discharges when in storage(All of the above)

50. What is the relationship between magnetism and electricity?
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to electrical current
--^V^V^V^---
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)

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Basic Electricity

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