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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 name for electrical resistance of insulation?
Mutual induction
Resistance value can not be changed
Alternating current
Insulation resistance

2. What is true about a dry cell?
Insulation resistance and Dielectric strength(Both A and B)
1 watt
Parallel circuit
Common - not rechargable - gradually discharges when in storage(All of the above)

3. 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
Insulation resistance
Alternating current
First digit
75 Ohms

4. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
50 Ohms
Produce heat - light - or limit current to control it(all of the above)
Resistance value can not be changed

5. What are the two generic methods to eliminate static electricity from metal objects?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
By their covering
Bonding and grounding
Plastic - Rubber - Friction(all of the above)

6. What is the type of cable composed of many fine wires?
Secondary cell
Stranded
High resistance
Start with the band on the end and read to the center

7. What is a property of inductors in electrical circuits?
American wire gauge(AWG)
Ohms
Stores electrical charge
Opposes any change in the current flowing in a circuit

8. What is another name for an inductor?
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)
Mutual induction
Choke

9. What is the purpose of resistors in electrical circuits?
Relationship between current and potential difference
Produce heat - light - or limit current to control it(all of the above)
Silver
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. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Common - not rechargable - gradually discharges when in storage(All of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Cell

11. 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
Parallel circuit
12 volts
DC current
A difference in potential energy

12. What is a switch that operates by electricity?
The rate of doing work
Gauge number
Relay
Heat

13. Which of the following materials is NOT a good conductor?
Porcelain
Tolerence
Stranded
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

14. What is an electromagnet?
10%
Electromagnetism
How much potential difference can a material withstand before breaking down
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

15. What do we call the ability to do work?
DC flows continuously in one direction and AC potential difference and current both change direction
Insulation resistance
Electromagnetism
Energy

16. What is induction?
Current change in a coil creates a magnetic change
1 watt
Heat
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

17. What instrument measures voltage?
Voltmeter
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Unlike poles attract
First digit is 9

18. When does a DC circuit oppose current flow?
DC flows continuously in one direction and AC potential difference and current both change direction
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Wire splices
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

19. What is a way to classify wires and cables?
Chemical action
By their covering
Voltmeter
Mutual induction

20. What does a moving charge produce?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposes any change in the current flowing in a circuit
A magnetic field
Silver

21. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Insulation resistance and Dielectric strength(Both A and B)
5%
Amperes
10%

22. When reading resistance color codes - what does the first band indicate?
Unlike poles attract
First digit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Series circuit

23. What is the relationship between cells and batteries?
Ability to store an electric charge
Electromagnetic field
Cells can be connected together to make a battery
Serial

24. What does a transformer transform?
Electromagnetism
Potential difference
The rate of doing work
The relationship of potential difference to current

25. The thermocouple uses which method for creating potential energy?
Heat
Bare - covered - insulated - stranded - cable(All of the above)
5%
15 -000 ohms - 20%

26. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Silver
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)

27. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Heat and current control(both a and c)
Moving vehicles
Mutual induction
12 volts

28. What is a common measure of wire diameter?
Gauge number
Insulation resistance and Dielectric strength(Both A and B)
Two
Plastic - Rubber - Friction(all of the above)

29. A resistor is color coded brown - green - orange. What is its resistance?
Alternating current
Cell
15 -000 ohms - 20%
Mutual induction

30. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Gauge number
From the negative battery terminal to the positive terminal
Mutual induction

31. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Mutual induction
5%
The direction of the magnetic field
Parallel

32. What type of circuit has one path of follow through a load?
Series circuit
Ohms
Porcelain
A difference in potential energy

33. What is capacitance in electrical terms?
Magnetic properties
Ability to store an electric charge
Plastic - Rubber - Friction(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

34. What determines the resistance of a resistor?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Composition of the resistor
1/1000th of an inch
Series circuit

35. What are the common units of measurement for round and square conductor cross - sections?
DC current
Circular and square mills(Both A and B)
Solenoid and Relay(both A and B)
The rate of doing work

36. What can permanently break down a capacitor?
Breakdown voltage
Amperes
50 Ohms
--^V^V^V^---

37. What is the basic law of magnetic force?
Gauge number
Two
Composition of the resistor
Unlike poles attract

38. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Mutual induction
Amperes
Alternating current

39. What makes electrons flow?
Ability to store an electric charge
Potential difference
Volts
Alternating current

40. What is insulation resistance?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electrical resistance against the flow of current
Unlike poles attract
Electromagnetism

41. What type of circuit has two or more paths for current to follow?
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)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Parallel circuit
Magnetic properties

42. What do junction boxes protect?
From the negative battery terminal to the positive terminal
Potential difference - E*I - current times current change from point to point(all of the above)
How much potential difference can a material withstand before breaking down
Wire splices

43. What does a third band of brown mean?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Fixed - tapped - variable(all of the above)
10
Fixed - Electrolytic - Variable(all of the above)

44. What is power?
--^V^V^V^---
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The rate of doing work
Gauge number

45. How is the heat production measured in a resistor?
Fixed - tapped - variable(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Ohms
Potential difference

46. What do transducers do in electrical terms?
Use an effect to produce another effect
Magnetic properties
75 Ohms
The direction of the magnetic field

47. Which of the following is a type of resistor?
75 Ohms
Fixed - tapped - variable(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Opposition to movement of free electrons

48. How many kinds of poles do magnets have?
Heat
Two
Parallel
Opposes any change in the current flowing in a circuit

49. What is the difference between AC and DC?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Symbol
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)
DC flows continuously in one direction and AC potential difference and current both change direction

50. How do you read resistor color codes?
Start with the band on the end and read to the center
Moving vehicles
Common - not rechargable - gradually discharges when in storage(All of the above)
Produce heat - light - or limit current to control it(all of the above)

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Basic Electricity

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