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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
5%
Electromagnetism
Breakdown voltage
50 Ohms

2. What does Ohm's Law represent?
Stranded
Relay
How much potential difference can a material withstand before breaking down
Relationship between current and potential difference

3. The generator is what method of creating potential energy?
High resistance
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
75 Ohms
Electromagnetism

4. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
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)
DC flows continuously in one direction and AC potential difference and current both change direction
Mutual induction
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

5. What is the relationship between cells and batteries?
Heat
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cells can be connected together to make a battery
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

6. What is a characteristic of a fixed 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)
10
Opposition to movement of free electrons
Resistance value can not be changed

7. What does resistance produce?
1 watt
Breakdown voltage
Heat
Volts

8. What is the unit of measurement of resistance?
15 -000 ohms - 20%
Electromagnetism
Opposes any change in the current flowing in a circuit
Ohms

9. What is a way to classify wires and cables?
Relay
Produce heat - light - or limit current to control it(all of the above)
By their covering
Composition of the resistor

10. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Magnetic properties
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

11. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Secondary cell
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Magnetic properties

12. What are the common units of measurement for round and square conductor cross - sections?
Insulation resistance
Circular and square mills(Both A and B)
Magnetic properties
Does not move

13. What is the term for doing work at the rate of joule per second?
Produce heat - light - or limit current to control it(all of the above)
Ohms
1 watt
Stores electrical charge

14. What is a type of capacitor?
20%
Stores electrical charge
Opposition to electrical current
Fixed - Electrolytic - Variable(all of the above)

15. What is a DC circuit characteristic?
Insulation resistance
Current flows in one direction - potential differences across a load does not change(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
Does not move

16. What is a common form used in conductors?
Electromagnetic field
Cables
Voltage
Gauge number

17. What results when current is run through a material with high resistance?
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Ohms
Heat and current control(both a and c)

18. Where do the fingers point in both Left-Hand Rules?
DC current
Tolerence
First digit is 9
The direction of the magnetic field

19. What type of circuit has one path of follow through a load?
DC flows continuously in one direction and AC potential difference and current both change direction
Silver
Series circuit
First digit is 9

20. Identify the blueprint symbol for resistors.
Insulation resistance and Dielectric strength(Both A and B)
The rate of doing work
Resistance increases as the conductor length increases
--^V^V^V^---

21. The thermocouple uses which method for creating potential energy?
Heat
American wire gauge(AWG)
From the negative battery terminal to the positive terminal
Symbol

22. What does a transformer transform?
75 Ohms
DC current
Symbol
The relationship of potential difference to current

23. When reading resistance color codes - what does the first band indicate?
First digit
Gauge number
Energy
12 volts

24. What does static electricity do?
Electromagnetism
Does not move
Electrical resistance against the flow of current
50 Ohms

25. What does an object have if a magnetic field acts on it?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
15 -000 ohms - 20%
50 Ohms
Magnetic properties

26. What is the relationship between magnetism and electricity?
A difference in potential energy
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)
Mutual induction
How much potential difference can a material withstand before breaking down

27. 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)
Serial
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10

28. What do transducers do in electrical terms?
Use an effect to produce another effect
50 Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10

29. What are the names of two of the six primary methods of producing a voltage?
Strength of the charge
A magnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

30. What is the use of the electromagnet?
Strength of the charge
Two
Stranded
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

31. What is the unit of measurement of potential difference?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Volts
Electromagnetism
Fixed - Electrolytic - Variable(all of the above)

32. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Electrical resistance against the flow of current
Unlike poles attract
Volts

33. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Common - not rechargable - gradually discharges when in storage(All of the above)
The rate of doing work
Ohms
10%

34. What makes electrons flow?
Insulation resistance
Potential difference
Stores electrical charge
Magnetic properties

35. Identify the blueprint symbol for capacitors.
Wire splices
Parallel circuit
Symbol
A difference in potential energy

36. What is an arrangement of materials that create a potential difference by chemistry?
Breakdown voltage
Fixed - Electrolytic - Variable(all of the above)
Cell
Heat

37. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
The rate of doing work
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Circular and square mills(Both A and B)

38. What is needed for electric heating elements and the filaments of light bulbs?
Bare - covered - insulated - stranded - cable(All of the above)
DC current
12 volts
High resistance

39. What do junction boxes protect?
A difference in potential energy
Wire splices
Silver
Volts

40. What is the measure of potential difference?
Symbol
Insulation resistance
Volts
Common - not rechargable - gradually discharges when in storage(All of the above)

41. What can permanently break down a capacitor?
Insulation resistance and Dielectric strength(Both A and B)
Electrical resistance against the flow of current
15 -000 ohms - 20%
Breakdown voltage

42. What is an electromagnet?
Produce heat - light - or limit current to control it(all of the above)
Opposition to electrical current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

43. What is induction?
Does not move
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)
How much potential difference can a material withstand before breaking down
Current change in a coil creates a magnetic change

44. What instrument measures voltage?
DC current
Magnetic properties
Voltmeter
Series circuit

45. What is the type of cable composed of many fine wires?
Heat
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
Stranded

46. What is the name for electrical resistance of insulation?
Opposition to movement of free electrons
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Insulation resistance
Heat

47. 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
The direction the negative charge moves
Bare - covered - insulated - stranded - cable(All of the above)
Magnetic properties

48. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Current flows in one direction - potential differences across a load does not change(Both A and B)
Use an effect to produce another effect
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

49. What type of circuit has two or more paths for current to follow?
Parallel circuit
The direction the negative charge moves
50 Ohms
Purging

50. What is a common cause of static electricity in a shop?
Moving vehicles
Relationship between current and potential difference
High resistance
Electromagnetic field

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Basic Electricity

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