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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 is insulation resistance?
Wire splices
15 -000 ohms - 20%
Electrical resistance against the flow of current
Amperes

2. What are the two generic methods to eliminate static electricity from metal objects?
Voltmeter
Potential difference
Electromagnetism
Bonding and grounding

3. What does a third band of brown mean?
10
1/1000th of an inch
A difference in potential energy
Cell

4. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Ohms
Potential difference - E*I - current times current change from point to point(all of the above)
5%

5. What is a property of inductors in electrical circuits?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Secondary cell
Relationship between current and potential difference
Opposes any change in the current flowing in a circuit

6. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Current change in a coil creates a magnetic change
10%

7. What is the term for two or more cells attached together?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
1/1000th of an inch
Use an effect to produce another effect
Battery

8. What is induction?
Tolerence
Ability to store an electric charge
Relay
Current change in a coil creates a magnetic change

9. What do we call the ability to do work?
Energy
Battery
Electromagnetic field
Parallel

10. What is a wire classification?
Stores electrical charge
Bare - covered - insulated - stranded - cable(All of the above)
Silver
Resistance value can not be changed

11. What is the purpose of resistors in electrical circuits?
Potential difference - E*I - current times current change from point to point(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Fixed - Electrolytic - Variable(all of the above)
Produce heat - light - or limit current to control it(all of the above)

12. What is the unit of measurement of electrical current?
Tolerence
20%
Amperes
Start with the band on the end and read to the center

13. What instrument measures voltage?
Voltmeter
Stores electrical charge
Unlike poles attract
20%

14. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Potential difference
Mutual induction
Battery

15. What must be large enough to carry the largest current likely to occur?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Electromagnetism
Grounding wire
15 -000 ohms - 20%

16. Which type of cell can be recharged?
Secondary cell
Potential difference
Ohms
10%

17. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Potential difference - E*I - current times current change from point to point(all of the above)
Stranded
Serial

18. What is a common measure of wire diameter?
Potential difference
Gauge number
Electrical resistance against the flow of current
Symbol

19. What is the use of the electromagnet?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
20%
Choke

20. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Heat
Parallel
Moving vehicles
Bonding and grounding

21. How do static charges distribute themselves?
1/1000th of an inch
Fixed - tapped - variable(all of the above)
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

22. What is a common form used in conductors?
Silver
Heat and current control(both a and c)
Parallel circuit
Cables

23. Identify the general blueprint symbol for inductors.
Heat
Symbol
The relationship of potential difference to current
1 watt

24. What determines whether a spark can be produced?
Does not move
Heat
Strength of the charge
Purging

25. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
10%
Common - not rechargable - gradually discharges when in storage(All of the above)
Unlike poles attract

26. What is a common cause of static electricity in a shop?
From the negative battery terminal to the positive terminal
Alternating current
Symbol
Moving vehicles

27. What information do the Left-Hand Rules provide?
The direction of the magnetic field
12 volts
Voltmeter
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

28. What is capacitance in electrical terms?
Ability to store an electric charge
Use an effect to produce another effect
Stranded
Moving vehicles

29. What is resistance in electrical terms?
Does not move
Opposition to electrical current
Moving vehicles
The relationship of potential difference to current

30. What results when current is run through a material with high resistance?
Strength of the charge
10
Heat and current control(both a and c)
The relationship of potential difference to current

31. What do junction boxes protect?
75 Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Wire splices
Opposes any change in the current flowing in a circuit

32. What is the relationship between cells and batteries?
Does not move
Cells can be connected together to make a battery
Breakdown voltage
Symbol

33. Identify the blueprint symbol for resistors.
--^V^V^V^---
Voltmeter
Fixed - Electrolytic - Variable(all of the above)
1 watt

34. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
A difference in potential energy
Potential difference
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)

35. What does static electricity do?
Common - not rechargable - gradually discharges when in storage(All of the above)
Silver
High resistance
Does not move

36. What is the name for electrical resistance of insulation?
Insulation resistance
Fixed - tapped - variable(all of the above)
First digit
A magnetic field

37. What do transducers do in electrical terms?
A magnetic field
Electromagnetism
Use an effect to produce another effect
Heat and current control(both a and c)

38. What is the purpose of a raceway?
50 Ohms
Insulation resistance
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

39. What is dielectric strength?
Serial
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
How much potential difference can a material withstand before breaking down
Silver

40. What is the relationship between magnetism and electricity?
50 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
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)

41. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Alternating current
Electromagnetic field
Ability to store an electric charge
50 Ohms

42. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
How much potential difference can a material withstand before breaking down
Ability to store an electric charge
Bare - covered - insulated - stranded - cable(All of the above)

43. What is a characteristic of a fixed resistor?
First digit
Moving vehicles
Choke
Resistance value can not be changed

44. What is resistance?
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons
Fixed - tapped - variable(all of the above)
Moving vehicles

45. The dry cell is what method for creating potential energy?
Unlike poles attract
Chemical action
First digit
Moving vehicles

46. What type of circuit has two or more paths for current to follow?
Parallel circuit
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)
15 -000 ohms - 20%

47. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Silver
First digit is 9
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

48. What can permanently break down a capacitor?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Breakdown voltage
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Secondary cell

49. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Gauge number
Serial
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Choke

50. 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
--^V^V^V^---
75 Ohms
1 watt
Electromagnetism