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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 does resistance produce?
Heat
Gauge number
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons

2. What are the two generic methods to eliminate static electricity from metal objects?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Energy
Stores electrical charge
Bonding and grounding

3. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Fixed - tapped - variable(all of the above)
Two
Breakdown voltage

4. What is another name for an inductor?
Wire splices
Voltage
Choke
High resistance

5. What type of circuit has two or more paths for current to follow?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Silver
Parallel circuit
Breakdown voltage

6. When reading resistance color codes - what does the fourth band indicate?
Tolerence
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
First digit
Strength of the charge

7. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Ohms
Voltage
A magnetic field
The relationship of potential difference to current

8. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Parallel circuit
Strength of the charge
DC current

9. What is dielectric strength?
12 volts
Secondary cell
How much potential difference can a material withstand before breaking down
Current change in a coil creates a magnetic change

10. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
Relay
By their covering
Bare - covered - insulated - stranded - cable(All of the above)

11. How is the heat production measured in a resistor?
12 volts
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
Symbol

12. What is a type of capacitor?
Produce heat - light - or limit current to control it(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Circular and square mills(Both A and B)
Fixed - Electrolytic - Variable(all of the above)

13. When reading resistance color codes - what does the first band indicate?
Choke
First digit
Opposition to electrical current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

14. What is a common form used in conductors?
High resistance
Cables
5%
15 -000 ohms - 20%

15. Which way is the current going in the circuit shown?(electron flow)
Cell
Volts
From the negative battery terminal to the positive terminal
Common - not rechargable - gradually discharges when in storage(All of the above)

16. What is the fundamental property of insulators?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
5%
Insulation resistance and Dielectric strength(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)

17. What is an arrangement of materials that create a potential difference by chemistry?
Breakdown voltage
20%
Heat and current control(both a and c)
Cell

18. How many kinds of poles do magnets have?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Serial
Two
Moving vehicles

19. What is a type of mechanical transducer?
Magnetic properties
The rate of doing work
Solenoid and Relay(both A and B)
Volts

20. Which type of cell can be recharged?
Current change in a coil creates a magnetic change
Secondary cell
Voltage
Unlike poles attract

21. What is power?
Stranded
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Grounding wire
The rate of doing work

22. What is the purpose of a raceway?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Opposition to movement of free electrons
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Chemical action

23. What do junction boxes protect?
Heat and current control(both a and c)
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)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Wire splices

24. Identify the blueprint symbol for resistors.
--^V^V^V^---
Grounding wire
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)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

25. What does a third band of brown mean?
DC current
Gauge number
10
Symbol

26. What is a property of inductors in electrical circuits?
Composition of the resistor
Opposes any change in the current flowing in a circuit
Moving vehicles
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

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

28. What is a conductor?
DC current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10
10%

29. What is capacitance in electrical terms?
Symbol
Start with the band on the end and read to the center
Ability to store an electric charge
Electromagnetism

30. What is the basic law of magnetic force?
Fixed - Electrolytic - Variable(all of the above)
Unlike poles attract
10
Parallel

31. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Gauge number
Symbol
Voltage
Alternating current

32. What is true about a dry cell?
Current change in a coil creates a magnetic change
Common - not rechargable - gradually discharges when in storage(All of the above)
Composition of the resistor
Fixed - tapped - variable(all of the above)

33. What type of circuit has one path of follow through a load?
Start with the band on the end and read to the center
Resistance value can not be changed
Series circuit
Plastic - Rubber - Friction(all of the above)

34. Where do the fingers point in both Left-Hand Rules?
Symbol
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Relationship between current and potential difference
The direction of the magnetic field

35. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Electromagnetic field
Does not move
Parallel
How much potential difference can a material withstand before breaking down

36. 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
Relationship between current and potential difference
Alternating current
Current change in a coil creates a magnetic change
12 volts

37. Why is the transformer important to AC electricity?

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38. When does a DC circuit oppose current flow?
Purging
Opposition to electrical current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Amperes

39. What is the unit of measurement of resistance?
Resistance increases as the conductor length increases
Heat and current control(both a and c)
Ohms
Opposition to electrical current

40. How do you read resistor color codes?
Amperes
Start with the band on the end and read to the center
Unlike poles attract
Resistance increases as the conductor length increases

41. The generator is what method of creating potential energy?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Purging
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetism

42. What is the name for electrical resistance of insulation?
First digit
Insulation resistance
DC current
Resistance increases as the conductor length increases

43. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Opposes any change in the current flowing in a circuit
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Serial
Relationship between current and potential difference

44. What does an object have if a magnetic field acts on it?
Magnetic properties
Bonding and grounding
Bare - covered - insulated - stranded - cable(All of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

45. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Voltmeter
Battery
Solenoid and Relay(both A and B)

46. What is insulation resistance?
Voltmeter
Magnetic properties
Electrical resistance against the flow of current
Start with the band on the end and read to the center

47. What does static electricity do?
Strength of the charge
The direction of the magnetic field
Does not move
Potential difference - E*I - current times current change from point to point(all of the above)

48. What is the type of cable composed of many fine wires?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Stranded
Series circuit
Cell

49. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Fixed - tapped - variable(all of the above)
A magnetic field
The relationship of potential difference to current

50. In most applications - what remains constant if the current remains constant and flows in one direction?
Serial
Ability to store an electric charge
1/1000th of an inch
Electromagnetic field

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Basic Electricity

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