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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 do junction boxes protect?
Wire splices
10
Stranded
20%

2. What is the difference between AC and DC?
American wire gauge(AWG)
Energy
DC flows continuously in one direction and AC potential difference and current both change direction
Two

3. Which type of cell can be recharged?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Secondary cell
Series circuit
Magnetic properties

4. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Purging
Fixed - tapped - variable(all of the above)

5. What is another name for an inductor?
Composition of the resistor
Choke
Use an effect to produce another effect
50 Ohms

6. What is the basic law of magnetic force?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cell
Unlike poles attract
Voltage

7. What are the two generic methods to eliminate static electricity from metal objects?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Bonding and grounding
10%
Heat and current control(both a and c)

8. What is the relationship of conductor size and length to resistance?
Stores electrical charge
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Resistance increases as the conductor length increases
First digit

9. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Stranded
DC current
The direction the negative charge moves

10. What is a characteristic of a fixed resistor?
Tolerence
Resistance value can not be changed
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)

11. What does resistance produce?
Parallel
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Heat
5%

12. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Wire splices
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat
50 Ohms

13. What is a characteristic of insulators?
Common - not rechargable - gradually discharges when in storage(All of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Amperes
Fixed - tapped - variable(all of the above)

14. Where does the thumb point in both Left-Hand Rules?
Voltmeter
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The direction the negative charge moves
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

15. 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
Serial
Potential difference
75 Ohms
--^V^V^V^---

16. What is dielectric strength?
Strength of the charge
Use an effect to produce another effect
15 -000 ohms - 20%
How much potential difference can a material withstand before breaking down

17. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
Breakdown voltage

18. What is true about a dry cell?
Heat
10
Common - not rechargable - gradually discharges when in storage(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

19. What is the type of cable composed of many fine wires?
Stranded
Cell
Volts
1 watt

20. What is the use of the electromagnet?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

21. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Volts
Plastic - Rubber - Friction(all of the above)
Strength of the charge

22. Identify the blueprint symbol for capacitors.
Symbol
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The relationship of potential difference to current
Unlike poles attract

23. What does Ohm's Law represent?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Composition of the resistor
Relationship between current and potential difference
Relay

24. 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
12 volts
DC current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Fixed - tapped - variable(all of the above)

25. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Resistance value can not be changed
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons
Purging

26. What is the term for doing work at the rate of joule per second?
Symbol
Electromagnetism
Heat
1 watt

27. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Amperes
Choke
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

28. What does static electricity do?
A magnetic field
50 Ohms
Volts
Does not move

29. Identify the general blueprint symbol for inductors.
Heat and current control(both a and c)
Symbol
Energy
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)

30. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Cells can be connected together to make a battery
20%
50 Ohms
Energy

31. What does a third band of brown mean?
10
Grounding wire
Potential difference
Parallel circuit

32. What is the measure of potential difference?
Fixed - tapped - variable(all of the above)
Volts
Use an effect to produce another effect
Relay

33. What is insulation resistance?
Electrical resistance against the flow of current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Heat
Secondary cell

34. What is a common measure of wire diameter?
Use an effect to produce another effect
Magnetic properties
Symbol
Gauge number

35. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
12 volts
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

36. What is an arrangement of materials that create a potential difference by chemistry?
Produce heat - light - or limit current to control it(all of the above)
The rate of doing work
Bare - covered - insulated - stranded - cable(All of the above)
Cell

37. What information do the Left-Hand Rules provide?
Electromagnetism
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Breakdown voltage

38. What do electrical charges need to cause a fire or explosion?
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)
Wire splices
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
50 Ohms

39. What is voltage?
A difference in potential energy
Energy
Start with the band on the end and read to the center
Cell

40. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Insulation resistance
Mutual induction
Parallel circuit

41. How do static charges distribute themselves?
Gauge number
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cell
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)

42. What is a conductor?
15 -000 ohms - 20%
Electromagnetism
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Cables

43. What is the purpose of resistors in electrical circuits?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Ohms
Volts
Produce heat - light - or limit current to control it(all of the above)

44. What instrument measures voltage?
The rate of doing work
Voltmeter
Electromagnetism
DC flows continuously in one direction and AC potential difference and current both change direction

45. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltage
5%
Amperes

46. What is a property of inductors in electrical circuits?
Heat
Secondary cell
Opposes any change in the current flowing in a circuit
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

47. What types of protective tapes are used?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Plastic - Rubber - Friction(all of the above)
Porcelain
Does not move

48. What is capacitance in electrical terms?
Resistance increases as the conductor length increases
Ability to store an electric charge
Voltage
The rate of doing work

49. What do transducers do in electrical terms?
Use an effect to produce another effect
Volts
Opposition to electrical current
Insulation resistance

50. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Fixed - tapped - variable(all of the above)
Ability to store an electric charge
Voltmeter

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Basic Electricity

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