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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. What does a third band of brown mean?
Bare - covered - insulated - stranded - cable(All of the above)
Heat
10
Solenoid and Relay(both A and B)

2. What is the measure of potential difference?
Heat
Produce heat - light - or limit current to control it(all of the above)
Volts
Stores electrical charge

3. What is the type of cable composed of many fine wires?
Heat and current control(both a and c)
Serial
12 volts
Stranded

4. What determines the resistance of a resistor?
Composition of the resistor
50 Ohms
Fixed - Electrolytic - Variable(all of the above)
Battery

5. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
High resistance
Amperes
Series circuit

6. When reading resistance color codes - what does the first band indicate?
Ability to store an electric charge
First digit
Heat and current control(both a and c)
Electrical resistance against the flow of current

7. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Volts
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)
Choke
20%

8. What is a common measure of wire diameter?
By their covering
Area and spacing of capacitor - static current in the capacitor(both A and B)
Gauge number
Chemical action

9. How do you read resistor color codes?
Start with the band on the end and read to the center
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
Use an effect to produce another effect

10. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Insulation resistance and Dielectric strength(Both A and B)
Alternating current
Volts
Produce heat - light - or limit current to control it(all of the above)

11. What is a characteristic of a fixed resistor?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance value can not be changed
Current flows in one direction - potential differences across a load does not change(Both A and B)
Fixed - tapped - variable(all of the above)

12. Where does the thumb point in both Left-Hand Rules?
Opposition to electrical current
The direction the negative charge moves
Ohms
Area and spacing of capacitor - static current in the capacitor(both A and B)

13. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Moving vehicles
Purging
Bare - covered - insulated - stranded - cable(All of the above)

14. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Produce heat - light - or limit current to control it(all of the above)
A difference in potential energy

15. A resistor is color coded brown - green - orange. What is its resistance?
Relay
Bonding and grounding
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)

16. What is the unit of measurement of electrical current?
Amperes
Composition of the resistor
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge

17. What is the term for doing work at the rate of joule per second?
Relationship between current and potential difference
1 watt
Magnetic properties
First digit is 9

18. Which of the following materials is NOT a good conductor?
75 Ohms
Porcelain
The direction the negative charge moves
Produce heat - light - or limit current to control it(all of the above)

19. What do junction boxes protect?
Porcelain
Chemical action
Volts
Wire splices

20. To what measurement do the conductor mills refer?
Battery
Volts
How much potential difference can a material withstand before breaking down
1/1000th of an inch

21. What does resistance produce?
Common - not rechargable - gradually discharges when in storage(All of the above)
Current change in a coil creates a magnetic change
Heat
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

22. What cannot be transformed to higher or lower potential differences?
Heat
Use an effect to produce another effect
DC current
Opposition to electrical current

23. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
How much potential difference can a material withstand before breaking down
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
1/1000th of an inch

24. What is power?
Chemical action
The rate of doing work
Ability to store an electric charge
First digit is 9

25. What is a common cause of static electricity in a shop?
How much potential difference can a material withstand before breaking down
Use an effect to produce another effect
Volts
Moving vehicles

26. How do static charges distribute themselves?
DC flows continuously in one direction and AC potential difference and current both change direction
12 volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposes any change in the current flowing in a circuit

27. Which type of cell can be recharged?
Resistance increases as the conductor length increases
The relationship of potential difference to current
Secondary cell
Cables

28. What type of circuit has one path of follow through a load?
Series circuit
10
12 volts
Composition of the resistor

29. What is true about a dry cell?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Insulation resistance and Dielectric strength(Both A and B)
Series circuit
Common - not rechargable - gradually discharges when in storage(All of the above)

30. 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
75 Ohms
Start with the band on the end and read to the center
Cell
Heat

31. What is resistance in electrical terms?
Opposition to electrical current
DC flows continuously in one direction and AC potential difference and current both change direction
Cables
1 watt

32. What do electrical charges need to cause a fire or explosion?
Insulation resistance
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The rate of doing work
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

33. What do we call the ability to do work?
Series circuit
20%
Energy
Fixed - tapped - variable(all of the above)

34. 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
Does not move
From the negative battery terminal to the positive terminal
Insulation resistance
12 volts

35. What is the term for two or more cells attached together?
Start with the band on the end and read to the center
First digit is 9
Plastic - Rubber - Friction(all of the above)
Battery

36. What is the fundamental property of insulators?
Purging
Insulation resistance and Dielectric strength(Both A and B)
Heat and current control(both a and c)
Unlike poles attract

37. What is the basic law of magnetic force?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Chemical action
Potential difference
Unlike poles attract

38. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Produce heat - light - or limit current to control it(all of the above)
5%
Serial
Moving vehicles

39. What is a switch that operates by electricity?
Relay
First digit is 9
Mutual induction
Parallel circuit

40. What is the name for electrical resistance of insulation?
Symbol
Insulation resistance
The direction of the magnetic field
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

41. What is a characteristic of insulators?
Alternating current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat

42. How many kinds of poles do magnets have?
Mutual induction
Two
The relationship of potential difference to current
1/1000th of an inch

43. What are the two generic methods to eliminate static electricity from metal objects?
Start with the band on the end and read to the center
Heat
Bonding and grounding
Volts

44. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Symbol
The direction of the magnetic field
Grounding wire
50 Ohms

45. What is an arrangement of materials that create a potential difference by chemistry?
Relationship between current and potential difference
Cell
Electromagnetic field
Porcelain

46. What is another name for an inductor?
Use an effect to produce another effect
10
Alternating current
Choke

47. In most applications - what remains constant if the current remains constant and flows in one direction?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Electromagnetic field
Potential difference

48. What does a transformer transform?
Does not move
Electromagnetism
The relationship of potential difference to current
Cables

49. What does static electricity do?
--^V^V^V^---
Does not move
Fixed - tapped - variable(all of the above)
Current change in a coil creates a magnetic change

50. What determines whether a spark can be produced?
50 Ohms
Ability to store an electric charge
Use an effect to produce another effect
Strength of the charge

Can you answer 50 questions in 15 minutes?

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Basic Electricity

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