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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. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
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)
Solenoid and Relay(both A and B)
Electromagnetism
5%

2. What does an object have if a magnetic field acts on it?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Relay
Magnetic properties
Amperes

3. 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)
Solenoid and Relay(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Mutual induction

4. What do we call the ability to do work?
Parallel circuit
Stores electrical charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Energy

5. What types of protective tapes are used?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cells can be connected together to make a battery
Start with the band on the end and read to the center
Plastic - Rubber - Friction(all of the above)

6. The generator is what method of creating potential energy?
Does not move
5%
Moving vehicles
Electromagnetism

7. What is the purpose of resistors in electrical circuits?
1/1000th of an inch
From the negative battery terminal to the positive terminal
Produce heat - light - or limit current to control it(all of the above)
Plastic - Rubber - Friction(all of the above)

8. What is the purpose of a raceway?
The relationship of potential difference to current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
DC current
Battery

9. What is a common cause of static electricity in a shop?
Alternating current
Moving vehicles
Electromagnetic field
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)

10. What is the unit of measurement of resistance?
Circular and square mills(Both A and B)
Ohms
First digit is 9
A difference in potential energy

11. What is the term for two or more cells attached together?
The direction of the magnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
Plastic - Rubber - Friction(all of the above)
Battery

12. What is the use of the electromagnet?
Choke
12 volts
The relationship of potential difference to current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

13. What is resistance?
High resistance
Opposition to movement of free electrons
1/1000th of an inch
Tolerence

14. What type of circuit has one path of follow through a load?
From the negative battery terminal to the positive terminal
Series circuit
Solenoid and Relay(both A and B)
Breakdown voltage

15. What makes electrons flow?
Purging
Gauge number
Potential difference
1 watt

16. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Parallel circuit
Volts
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

17. When reading resistance color codes - what does the fourth band indicate?
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)
Tolerence
Fixed - Electrolytic - Variable(all of the above)
Produce heat - light - or limit current to control it(all of the above)

18. What do junction boxes protect?
Wire splices
Resistance value can not be changed
Chemical action
Current flows in one direction - potential differences across a load does not change(Both A and B)

19. The thermocouple uses which method for creating potential energy?
Bare - covered - insulated - stranded - cable(All of the above)
Heat
Voltmeter
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

20. What is another name for an inductor?
Does not move
Composition of the resistor
20%
Choke

21. Which material has the lowest resistance at ordinary temperatures?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Volts
Silver
Bare - covered - insulated - stranded - cable(All of the above)

22. What is induction?
First digit is 9
Bare - covered - insulated - stranded - cable(All of the above)
Current change in a coil creates a magnetic change
Resistance increases as the conductor length increases

23. How do static charges distribute themselves?
Stores electrical charge
1/1000th of an inch
5%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

24. What does Ohm's Law represent?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Relationship between current and potential difference
Heat and current control(both a and c)
Grounding wire

25. How many kinds of poles do magnets have?
Current change in a coil creates a magnetic change
Symbol
Two
Amperes

26. The dry cell is what method for creating potential energy?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Chemical action
Cell
15 -000 ohms - 20%

27. What is power?
Symbol
Use an effect to produce another effect
Porcelain
The rate of doing work

28. What does resistance produce?
Common - not rechargable - gradually discharges when in storage(All of the above)
Tolerence
Heat
Breakdown voltage

29. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Relay
Produce heat - light - or limit current to control it(all of the above)
Moving vehicles

30. What wire measurement is commonly used in the U.S.?
Moving vehicles
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)
American wire gauge(AWG)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

31. What is the basic law of magnetic force?
The direction the negative charge moves
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Unlike poles attract
Mutual induction

32. When reading resistance color codes - what does the first band indicate?
Gauge number
75 Ohms
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)
First digit

33. When does a DC circuit oppose current flow?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
12 volts

34. What is a type of capacitor?
Two
Tolerence
Stores electrical charge
Fixed - Electrolytic - Variable(all of the above)

35. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Composition of the resistor
Electromagnetism
Resistance value can not be changed

36. Which of the following materials is NOT a good conductor?
Stranded
20%
Porcelain
Solenoid and Relay(both A and B)

37. What does a moving charge produce?
Produce heat - light - or limit current to control it(all of the above)
Potential difference
First digit is 9
A magnetic field

38. What is voltage?
Does not move
A difference in potential energy
Ability to store an electric charge
5%

39. What is the relationship of conductor size and length to resistance?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
20%
Resistance increases as the conductor length increases
Heat

40. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
The rate of doing work
Purging
DC current
1 watt

41. What is a wire classification?
Use an effect to produce another effect
Circular and square mills(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

42. What is the relationship between cells and batteries?
DC current
Cells can be connected together to make a battery
Potential difference
10%

43. Where does the thumb point in both Left-Hand Rules?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Voltage
The direction the negative charge moves
Electromagnetism

44. What is a type of mechanical transducer?
Fixed - Electrolytic - Variable(all of the above)
Insulation resistance
Composition of the resistor
Solenoid and Relay(both A and B)

45. What are the two generic methods to eliminate static electricity from metal objects?
Energy
Secondary cell
Ohms
Bonding and grounding

46. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Voltage
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

47. Which way is the current going in the circuit shown?(electron flow)
First digit
From the negative battery terminal to the positive terminal
Magnetic properties
Tolerence

48. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Produce heat - light - or limit current to control it(all of the above)
10%
Start with the band on the end and read to the center
American wire gauge(AWG)

49. How is the heat production measured in a resistor?
Opposition to electrical current
Potential difference - E*I - current times current change from point to point(all of the above)
Chemical action
Magnetic properties

50. What is an arrangement of materials that create a potential difference by chemistry?
Parallel circuit
How much potential difference can a material withstand before breaking down
Cell
10

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Basic Electricity

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