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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 is the unit of measurement of potential difference?
Use an effect to produce another effect
Solenoid and Relay(both A and B)
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)
Volts

2. What is the fundamental property of insulators?
Potential difference
Series circuit
Insulation resistance and Dielectric strength(Both A and B)
Ability to store an electric charge

3. What is the purpose of a raceway?
Wire splices
Volts
Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

4. What is induction?
Ability to store an electric charge
Current change in a coil creates a magnetic change
Volts
Insulation resistance

5. What type of circuit has one path of follow through a load?
Voltage
Magnetic properties
High resistance
Series circuit

6. What does an object have if a magnetic field acts on it?
Energy
Grounding wire
Magnetic properties
High resistance

7. What does a first band of white mean?
Mutual induction
Opposition to electrical current
First digit is 9
Stranded

8. What is a common cause of static electricity in a shop?
DC flows continuously in one direction and AC potential difference and current both change direction
12 volts
The direction of the magnetic field
Moving vehicles

9. What is a characteristic of insulators?
Voltage
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Bare - covered - insulated - stranded - cable(All of the above)

10. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Wire splices
Alternating current
Magnetic properties
High resistance

11. What is a type of capacitor?
Ability to store an electric charge
Silver
Fixed - Electrolytic - Variable(all of the above)
Cells can be connected together to make a battery

12. In most applications - what remains constant if the current remains constant and flows in one direction?
The rate of doing work
American wire gauge(AWG)
Electromagnetic field
Potential difference - E*I - current times current change from point to point(all of the above)

13. What is a type of mechanical transducer?
Resistance value can not be changed
The direction of the magnetic field
Solenoid and Relay(both A and B)
How much potential difference can a material withstand before breaking down

14. What does a transformer transform?
Gauge number
The relationship of potential difference to current
Parallel
From the negative battery terminal to the positive terminal

15. What is an electromagnet?
Relationship between current and potential difference
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electrical resistance against the flow of current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

16. What is the use of the electromagnet?
The direction of the magnetic field
Symbol
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel

17. What is a property of inductors in electrical circuits?
Potential difference
Opposes any change in the current flowing in a circuit
The relationship of potential difference to current
Insulation resistance

18. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
By their covering
10%

19. How do you read resistor color codes?
Opposition to electrical current
Potential difference
1 watt
Start with the band on the end and read to the center

20. Identify the blueprint symbol for resistors.
Breakdown voltage
--^V^V^V^---
Resistance increases as the conductor length increases
Wire splices

21. What is a rigid metal conduit?
Start with the band on the end and read to the center
Potential difference - E*I - current times current change from point to point(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Current change in a coil creates a magnetic change

22. 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
Gauge number
The direction of the magnetic field
12 volts
Opposition to movement of free electrons

23. What is a wire classification?
Bonding and grounding
Bare - covered - insulated - stranded - cable(All of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Potential difference - E*I - current times current change from point to point(all of the above)

24. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Resistance increases as the conductor length increases
Relationship between current and potential difference
Tolerence
Parallel

25. What is dielectric strength?
Current flows in one direction - potential differences across a load does not change(Both A and B)
How much potential difference can a material withstand before breaking down
1/1000th of an inch
Two

26. What do electrical charges need to cause a fire or explosion?
Breakdown voltage
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

27. What does Ohm's Law represent?
First digit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

28. Why is the transformer important to AC electricity?

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29. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Magnetic properties
Purging
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Opposes any change in the current flowing in a circuit

30. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
20%
Solenoid and Relay(both A and B)

31. What is insulation resistance?
Electrical resistance against the flow of current
Solenoid and Relay(both A and B)
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)
Stores electrical charge

32. What is another name for an inductor?
Electrical resistance against the flow of current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke

33. What is an arrangement of materials that create a potential difference by chemistry?
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)
Potential difference
Amperes
Cell

34. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
From the negative battery terminal to the positive terminal
Mutual induction
Chemical action
Resistance value can not be changed

35. What must be large enough to carry the largest current likely to occur?
Voltmeter
Grounding wire
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Insulation resistance

36. What is resistance?
Chemical action
Opposition to movement of free electrons
Wire splices
From the negative battery terminal to the positive terminal

37. What is the name for electrical resistance of insulation?
Common - not rechargable - gradually discharges when in storage(All of the above)
First digit
Insulation resistance
Stranded

38. What does a moving charge produce?
Relationship between current and potential difference
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
A magnetic field
Battery

39. What is a common measure of wire diameter?
A magnetic field
Electromagnetic field
Gauge number
50 Ohms

40. When does a DC circuit oppose current flow?
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)
Insulation resistance
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A difference in potential energy

41. Which material has the lowest resistance at ordinary temperatures?
Use an effect to produce another effect
Silver
Resistance value can not be changed
Does not move

42. What makes electrons flow?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference
Alternating current
Opposition to electrical current

43. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Silver
Energy
Parallel

44. What does a third band of brown mean?
10
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Does not move
1/1000th of an inch

45. What results when current is run through a material with high resistance?
10%
Heat and current control(both a and c)
Fixed - Electrolytic - Variable(all of the above)
Choke

46. What is the basic law of magnetic force?
Energy
Unlike poles attract
DC flows continuously in one direction and AC potential difference and current both change direction
15 -000 ohms - 20%

47. What is resistance in electrical terms?
Opposition to electrical current
First digit
The direction the negative charge moves
Wire splices

48. What is the unit of measurement of resistance?
Serial
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Ohms
Secondary cell

49. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Start with the band on the end and read to the center
Choke
50 Ohms
Resistance value can not be changed

50. To what measurement do the conductor mills refer?
1/1000th of an inch
Use an effect to produce another effect
Relay
Wire splices

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Basic Electricity

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