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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. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Opposition to electrical current
Potential difference
10%
Cables

2. What determines whether a spark can be produced?
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
5%
Symbol

3. What is the term for two or more cells attached together?
By their covering
Series circuit
Battery
The relationship of potential difference to current

4. What must be large enough to carry the largest current likely to occur?
Fixed - Electrolytic - Variable(all of the above)
Grounding wire
Electromagnetism
Gauge number

5. What is capacitance in electrical terms?
Ability to store an electric charge
Potential difference
Composition of the resistor
Bonding and grounding

6. Which way is the current going in the circuit shown?(electron flow)
Grounding wire
From the negative battery terminal to the positive terminal
50 Ohms
Area and spacing of capacitor - static current in the capacitor(both A and B)

7. What is voltage?
Purging
Potential difference - E*I - current times current change from point to point(all of the above)
A difference in potential energy
Unlike poles attract

8. What is the measure of potential difference?
75 Ohms
Alternating current
Insulation resistance
Volts

9. What is the type of cable composed of many fine wires?
Stranded
Opposition to movement of free electrons
Volts
From the negative battery terminal to the positive terminal

10. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
By their covering
Insulation resistance and Dielectric strength(Both A and B)
Voltage
Porcelain

11. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Symbol
1/1000th of an inch
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

12. What can permanently break down a capacitor?
Resistance increases as the conductor length increases
Fixed - tapped - variable(all of the above)
From the negative battery terminal to the positive terminal
Breakdown voltage

13. What is a type of capacitor?
High resistance
Volts
Voltage
Fixed - Electrolytic - Variable(all of the above)

14. What information do the Left-Hand Rules provide?
Heat and current control(both a and c)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Moving vehicles
Opposition to electrical current

15. What are the two generic methods to eliminate static electricity from metal objects?
Use an effect to produce another effect
Bonding and grounding
Cell
How much potential difference can a material withstand before breaking down

16. When reading resistance color codes - what does the fourth band indicate?
10
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Tolerence
Porcelain

17. What makes electrons flow?
Potential difference
Ability to store an electric charge
Electrical resistance against the flow of current
Electromagnetism

18. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Alternating current
Moving vehicles
Cables

19. What is resistance?
Strength of the charge
Circular and square mills(Both A and B)
Opposition to movement of free electrons
--^V^V^V^---

20. What does Ohm's Law represent?
Fixed - tapped - variable(all of the above)
First digit is 9
Relationship between current and potential difference
75 Ohms

21. What is the difference between AC and DC?
Stores electrical charge
Bare - covered - insulated - stranded - cable(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction

22. What is a way to classify wires and cables?
Tolerence
Ohms
By their covering
DC current

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

24. What wire measurement is commonly used in the U.S.?
Battery
Purging
A magnetic field
American wire gauge(AWG)

25. 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
Potential difference
Opposition to electrical current
American wire gauge(AWG)

26. What is the purpose of capacitors in electrical circuits?
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
Stores electrical charge

27. What is the fundamental property of insulators?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Insulation resistance and Dielectric strength(Both A and B)
Mutual induction
Amperes

28. What does a moving charge produce?
Stranded
Series circuit
Electromagnetic field
A magnetic field

29. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Cables
Wire splices
20%
Insulation resistance and Dielectric strength(Both A and B)

30. What is the name for electrical resistance of insulation?
Insulation resistance
Magnetic properties
High resistance
American wire gauge(AWG)

31. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
10
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
5%

32. What is the unit of measurement of potential difference?
Volts
Bonding and grounding
Gauge number
The direction the negative charge moves

33. What is a characteristic of a fixed resistor?
Does not move
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Secondary cell
Resistance value can not be changed

34. Why is the transformer important to AC electricity?

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35. 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
12 volts
Circular and square mills(Both A and B)
Solenoid and Relay(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction

36. What is a common form used in conductors?
Series circuit
Cables
By their covering
Fixed - tapped - variable(all of the above)

37. What does a first band of white mean?
15 -000 ohms - 20%
Serial
First digit is 9
Resistance increases as the conductor length increases

38. Where does the thumb point in both Left-Hand Rules?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The direction the negative charge moves
10%

39. What cannot be transformed to higher or lower potential differences?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A magnetic field
DC current
Heat and current control(both a and c)

40. Identify the blueprint symbol for resistors.
--^V^V^V^---
Resistance value can not be changed
Volts
Bare - covered - insulated - stranded - cable(All of the above)

41. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Wire splices
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Parallel
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

42. What do transducers do in electrical terms?
Use an effect to produce another effect
Relationship between current and potential difference
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Breakdown voltage

43. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
Cells can be connected together to make a battery
From the negative battery terminal to the positive terminal
75 Ohms

44. What do electrical charges need to cause a fire or explosion?
How much potential difference can a material withstand before breaking down
Amperes
Electromagnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

45. What is a type of mechanical transducer?
Stores electrical charge
Purging
Alternating current
Solenoid and Relay(both A and B)

46. What is the basic law of magnetic force?
DC current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Unlike poles attract

47. In most applications - what remains constant if the current remains constant and flows in one direction?
First digit
Use an effect to produce another effect
Electromagnetic field
Voltage

48. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Unlike poles attract
The direction the negative charge moves
Area and spacing of capacitor - static current in the capacitor(both A and B)

49. What is a common cause of static electricity in a shop?
Symbol
Moving vehicles
Gauge number
Two

50. What is the purpose of resistors in electrical circuits?
50 Ohms
Electromagnetism
Produce heat - light - or limit current to control it(all of the above)
Battery

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Basic Electricity

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