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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. What makes electrons flow?
Potential difference
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Stranded
Silver

2. What type of circuit has two or more paths for current to follow?
20%
Does not move
Parallel circuit
1 watt

3. 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
Heat
Parallel
Serial
75 Ohms

4. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Resistance increases as the conductor length increases
Volts
--^V^V^V^---

5. What instrument measures voltage?
12 volts
Voltage
Electrical resistance against the flow of current
Voltmeter

6. What is dielectric strength?
The direction the negative charge moves
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)
Potential difference
How much potential difference can a material withstand before breaking down

7. What makes electrons flow?
1 watt
Volts
Ohms
Potential difference

8. What is a common measure of wire diameter?
--^V^V^V^---
Tolerence
Gauge number
Current change in a coil creates a magnetic change

9. Which material has the lowest resistance at ordinary temperatures?
Stores electrical charge
Silver
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat

10. How many kinds of poles do magnets have?
Two
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Stranded
Parallel

11. What determines whether a spark can be produced?
Energy
Wire splices
75 Ohms
Strength of the charge

12. To what measurement do the conductor mills refer?
1/1000th of an inch
By their covering
12 volts
Serial

13. What is a wire classification?
Does not move
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

14. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
DC flows continuously in one direction and AC potential difference and current both change direction
Current flows in one direction - potential differences across a load does not change(Both A and B)
Ohms

15. What does static electricity do?
The direction the negative charge moves
Does not move
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Electromagnetism

16. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Electromagnetic field
Voltage
Cells can be connected together to make a battery

17. Which type of cell can be recharged?
Cables
High resistance
Does not move
Secondary cell

18. Identify the blueprint symbol for capacitors.
12 volts
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)
Symbol
Mutual induction

19. What is a DC circuit characteristic?
First digit is 9
A magnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)

20. What does resistance produce?
Potential difference
Cells can be connected together to make a battery
Gauge number
Heat

21. What is induction?
DC current
Plastic - Rubber - Friction(all of the above)
Current change in a coil creates a magnetic change
First digit is 9

22. What is the type of cable composed of many fine wires?
Plastic - Rubber - Friction(all of the above)
How much potential difference can a material withstand before breaking down
Fixed - tapped - variable(all of the above)
Stranded

23. What is resistance in electrical terms?
Does not move
High resistance
First digit
Opposition to electrical current

24. What is the relationship between cells and batteries?
By their covering
Cells can be connected together to make a battery
Resistance value can not be changed
Opposition to electrical current

25. What is a rigid metal conduit?
Stores electrical charge
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Purging
Alternating current

26. 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)
High resistance
Amperes
Current flows in one direction - potential differences across a load does not change(Both A and B)

27. What does an object have if a magnetic field acts on it?
Solenoid and Relay(both A and B)
20%
Circular and square mills(Both A and B)
Magnetic properties

28. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Chemical action
10%
Gauge number
Choke

29. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
10%
Bonding and grounding
Battery

30. What is a characteristic of a fixed resistor?
1 watt
High resistance
Moving vehicles
Resistance value can not be changed

31. 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)
Secondary cell
5%
Electromagnetism

32. What does a third band of brown mean?
Insulation resistance
The relationship of potential difference to current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10

33. Which of the following materials is NOT a good conductor?
Insulation resistance and Dielectric strength(Both A and B)
Opposition to electrical current
Porcelain
Serial

34. What is the fundamental property of insulators?
The direction of the magnetic field
Insulation resistance and Dielectric strength(Both A and B)
Plastic - Rubber - Friction(all of the above)
Cell

35. What does a moving charge produce?
Cell
First digit
Tolerence
A magnetic field

36. What is the term for doing work at the rate of joule per second?
1/1000th of an inch
Symbol
The relationship of potential difference to current
1 watt

37. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Bare - covered - insulated - stranded - cable(All of the above)
75 Ohms
A difference in potential energy

38. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Purging
15 -000 ohms - 20%
Grounding wire

39. In most applications - what remains constant if the current remains constant and flows in one direction?
Heat
Mutual induction
Tolerence
Electromagnetic field

40. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Chemical action
Start with the band on the end and read to the center
Stores electrical charge

41. What is the unit of measurement of potential difference?
Magnetic properties
Parallel
5%
Volts

42. What is true about a dry cell?
Volts
10%
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

43. What is a property of inductors in electrical circuits?
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts
Opposes any change in the current flowing in a circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

44. Identify the blueprint symbol for resistors.
High resistance
--^V^V^V^---
Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)

45. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Silver
Bare - covered - insulated - stranded - cable(All of the above)
A difference in potential energy

46. How is capacitance determined?
Silver
Area and spacing of capacitor - static current in the capacitor(both A and B)
DC current
Voltmeter

47. What is a switch that operates by electricity?
Relay
A magnetic field
Electromagnetic field
Electrical resistance against the flow of current

48. What is the unit of measurement of resistance?
Relationship between current and potential difference
Ohms
Start with the band on the end and read to the center
Cell

49. What is a way to classify wires and cables?
Current change in a coil creates a magnetic change
Solenoid and Relay(both A and B)
15 -000 ohms - 20%
By their covering

50. What results when current is run through a material with high resistance?
Moving vehicles
Solenoid and Relay(both A and B)
Heat and current control(both a and c)
Cables