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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. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
1/1000th of an inch
Relay
Two
Voltage

2. What is a wire classification?
DC flows continuously in one direction and AC potential difference and current both change direction
Bare - covered - insulated - stranded - cable(All of the above)
The direction the negative charge moves
Volts

3. What is the name for electrical resistance of insulation?
Resistance value can not be changed
A magnetic field
Insulation resistance
First digit

4. What is needed for electric heating elements and the filaments of light bulbs?
Breakdown voltage
Stranded
High resistance
Opposition to movement of free electrons

5. How is capacitance determined?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy
Insulation resistance and Dielectric strength(Both A and B)

6. Why is the transformer important to AC electricity?

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7. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Energy
5%
The direction of the magnetic field
Electromagnetism

8. What do junction boxes protect?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10%
Wire splices
Insulation resistance and Dielectric strength(Both A and B)

9. What does an object have if a magnetic field acts on it?
Choke
High resistance
Magnetic properties
--^V^V^V^---

10. What is the measure of potential difference?
Mutual induction
Alternating current
Volts
Insulation resistance and Dielectric strength(Both A and B)

11. What do we call the ability to do work?
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)
Magnetic properties
Energy
American wire gauge(AWG)

12. What does a third band of brown mean?
First digit
10
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Potential difference

13. What does a transformer transform?
Symbol
American wire gauge(AWG)
Magnetic properties
The relationship of potential difference to current

14. What is the term for doing work at the rate of joule per second?
Strength of the charge
Stores electrical charge
50 Ohms
1 watt

15. What determines the resistance of a resistor?
Breakdown voltage
Symbol
Fixed - tapped - variable(all of the above)
Composition of the resistor

16. What determines whether a spark can be produced?
Fixed - tapped - variable(all of the above)
Volts
Insulation resistance
Strength of the charge

17. The thermocouple uses which method for creating potential energy?
Unlike poles attract
Heat
Gauge number
Opposition to movement of free electrons

18. What is a characteristic of a fixed resistor?
Potential difference
Resistance value can not be changed
By their covering
Parallel circuit

19. 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)
Resistance value can not be changed
Stranded
Ohms

20. What is a switch that operates by electricity?
Does not move
Potential difference - E*I - current times current change from point to point(all of the above)
5%
Relay

21. What does a moving charge produce?
First digit
A magnetic field
Voltage
Stores electrical charge

22. What is resistance?
DC flows continuously in one direction and AC potential difference and current both change direction
Symbol
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons

23. What does resistance produce?
Symbol
Purging
DC flows continuously in one direction and AC potential difference and current both change direction
Heat

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

25. Identify the general blueprint symbol for inductors.
Opposes any change in the current flowing in a circuit
Purging
Symbol
Serial

26. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Composition of the resistor
Serial
Opposition to electrical current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

27. What are the two generic methods to eliminate static electricity from metal objects?
Gauge number
Insulation resistance and Dielectric strength(Both A and B)
75 Ohms
Bonding and grounding

28. What is the unit of measurement of resistance?
Fixed - Electrolytic - Variable(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Resistance value can not be changed
Ohms

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

30. What is the basic law of magnetic force?
Relationship between current and potential difference
1 watt
Unlike poles attract
Parallel

31. How do you read resistor color codes?
10%
High resistance
Fixed - Electrolytic - Variable(all of the above)
Start with the band on the end and read to the center

32. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Insulation resistance
Solenoid and Relay(both A and B)
Opposition to electrical current

33. What is a common measure of wire diameter?
Volts
Gauge number
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
--^V^V^V^---

34. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Opposition to electrical current
Volts
Start with the band on the end and read to the center

35. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
A difference in potential energy
Fixed - Electrolytic - Variable(all of the above)
10%
How much potential difference can a material withstand before breaking down

36. In most applications - what remains constant if the current remains constant and flows in one direction?
Bonding and grounding
Bare - covered - insulated - stranded - cable(All of the above)
Electromagnetic field
Resistance increases as the conductor length increases

37. What is a common cause of static electricity in a shop?
Strength of the charge
75 Ohms
The direction of the magnetic field
Moving vehicles

38. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
20%
Resistance increases as the conductor length increases
Volts

39. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Chemical action
Voltmeter
Heat and current control(both a and c)

40. Identify the blueprint symbol for capacitors.
Silver
Symbol
Common - not rechargable - gradually discharges when in storage(All of the above)
50 Ohms

41. How do static charges distribute themselves?
Solenoid and Relay(both A and B)
Breakdown voltage
Resistance value can not be changed
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

42. What is the purpose of capacitors in electrical circuits?
Breakdown voltage
Stores electrical charge
Wire splices
Secondary cell

43. What is resistance in electrical terms?
Parallel
Porcelain
Opposition to electrical current
Wire splices

44. What is the relationship between cells and batteries?
Heat
Purging
1 watt
Cells can be connected together to make a battery

45. What can permanently break down a capacitor?
By their covering
Breakdown voltage
Strength of the charge
The rate of doing work

46. What is a property of inductors in electrical circuits?
Series circuit
10
Opposes any change in the current flowing in a circuit
The rate of doing work

47. What type of circuit has one path of follow through a load?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Series circuit
High resistance
Purging

48. 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
Magnetic properties
Resistance increases as the conductor length increases
12 volts
Stranded

49. What results when current is run through a material with high resistance?
Volts
High resistance
The rate of doing work
Heat and current control(both a and c)

50. What is voltage?
Bare - covered - insulated - stranded - cable(All of the above)
A difference in potential energy
Opposition to electrical current
Stranded

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Basic Electricity

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