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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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 determines whether a spark can be produced?
Strength of the charge
Magnetic properties
Voltage
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

2. What determines the resistance of a resistor?
Porcelain
Composition of the resistor
Fixed - Electrolytic - Variable(all of the above)
Voltmeter

3. What is a common form used in conductors?
First digit is 9
From the negative battery terminal to the positive terminal
Cables
Use an effect to produce another effect

4. What is the purpose of resistors in electrical circuits?
Amperes
Produce heat - light - or limit current to control it(all of the above)
Current change in a coil creates a magnetic change
5%

5. What is resistance?
Fixed - Electrolytic - Variable(all of the above)
Ohms
DC current
Opposition to movement of free electrons

6. Which of the following materials is NOT a good conductor?
Plastic - Rubber - Friction(all of the above)
Magnetic properties
Potential difference
Porcelain

7. What is the measure of potential difference?
Volts
Circular and square mills(Both A and B)
Wire splices
Magnetic properties

8. What do we call the ability to do work?
Unlike poles attract
5%
Common - not rechargable - gradually discharges when in storage(All of the above)
Energy

9. What is power?
The rate of doing work
Voltmeter
Potential difference
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

10. What instrument measures voltage?
Choke
Voltmeter
Two
Resistance value can not be changed

11. What is the term for doing work at the rate of joule per second?
Potential difference - E*I - current times current change from point to point(all of the above)
1 watt
5%
Stranded

12. Where do the fingers point in both Left-Hand Rules?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The direction of the magnetic field
Cells can be connected together to make a battery
Volts

13. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Current flows in one direction - potential differences across a load does not change(Both A and B)
Magnetic properties
Relay

14. What is the use of the electromagnet?
10
Mutual induction
Current flows in one direction - potential differences across a load does not change(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

15. What can permanently break down a capacitor?
Symbol
Breakdown voltage
A magnetic field
Voltmeter

16. What is a type of capacitor?
10%
Breakdown voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Fixed - Electrolytic - Variable(all of the above)

17. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
First digit is 9
Start with the band on the end and read to the center
How much potential difference can a material withstand before breaking down

18. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Resistance increases as the conductor length increases
By their covering
Two
5%

19. What cannot be transformed to higher or lower potential differences?
--^V^V^V^---
DC current
By their covering
Choke

20. 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
Voltage
Mutual induction
Common - not rechargable - gradually discharges when in storage(All of the above)

21. How do you read resistor color codes?
Moving vehicles
Plastic - Rubber - Friction(all of the above)
Magnetic properties
Start with the band on the end and read to the center

22. What is a type of mechanical transducer?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Mutual induction
First digit is 9
Solenoid and Relay(both A and B)

23. What results when current is run through a material with high resistance?
Two
Heat and current control(both a and c)
Fixed - Electrolytic - Variable(all of the above)
Moving vehicles

24. How is capacitance determined?
Cables
Electromagnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)
Tolerence

25. What are the common units of measurement for round and square conductor cross - sections?
How much potential difference can a material withstand before breaking down
DC flows continuously in one direction and AC potential difference and current both change direction
Circular and square mills(Both A and B)
Energy

26. What type of circuit has one path of follow through a load?
Symbol
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Series circuit

27. Why is the transformer important to AC electricity?

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28. 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)
15 -000 ohms - 20%
Strength of the charge
Heat

29. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
The rate of doing work
Insulation resistance
10

30. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Circular and square mills(Both A and B)
Resistance value can not be changed
50 Ohms
Heat

31. Where does the thumb point in both Left-Hand Rules?
Potential difference - E*I - current times current change from point to point(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Opposes any change in the current flowing in a circuit
The direction the negative charge moves

32. What is another name for an inductor?
50 Ohms
Secondary cell
Electromagnetism
Choke

33. What does a first band of white mean?
First digit is 9
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Opposes any change in the current flowing in a circuit
Parallel

34. Identify the blueprint symbol for resistors.
Purging
--^V^V^V^---
Volts
Potential difference - E*I - current times current change from point to point(all of the above)

35. What do junction boxes protect?
20%
The relationship of potential difference to current
Wire splices
Chemical action

36. Which type of cell can be recharged?
Electrical resistance against the flow of current
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)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Secondary cell

37. Which material has the lowest resistance at ordinary temperatures?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Silver
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
First digit

38. What is the unit of measurement of electrical current?
Amperes
Produce heat - light - or limit current to control it(all of the above)
Plastic - Rubber - Friction(all of the above)
Potential difference

39. What is the purpose of capacitors in electrical circuits?
Start with the band on the end and read to the center
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Composition of the resistor
Stores electrical charge

40. The generator is what method of creating potential energy?
From the negative battery terminal to the positive terminal
Potential difference
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Electromagnetism

41. When reading resistance color codes - what does the fourth band indicate?
Amperes
Produce heat - light - or limit current to control it(all of the above)
Tolerence
Cells can be connected together to make a battery

42. What is a conductor?
Purging
Potential difference
Energy
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

43. What is a wire classification?
Amperes
Start with the band on the end and read to the center
Symbol
Bare - covered - insulated - stranded - cable(All of the above)

44. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Does not move
Area and spacing of capacitor - static current in the capacitor(both A and B)
Heat

45. What makes electrons flow?
12 volts
Moving vehicles
Potential difference
Symbol

46. What is the unit of measurement of potential difference?
Purging
The rate of doing work
Volts
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

47. What is the relationship between cells and batteries?
Ability to store an electric charge
From the negative battery terminal to the positive terminal
Cells can be connected together to make a battery
12 volts

48. What is an arrangement of materials that create a potential difference by chemistry?
Wire splices
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Cell
Ability to store an electric charge

49. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Volts
Alternating current
Porcelain
Stores electrical charge

50. What do electrical charges need to cause a fire or explosion?
Unlike poles attract
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltage
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside