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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 true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Composition of the resistor
Use an effect to produce another effect
The rate of doing work

2. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
20%
From the negative battery terminal to the positive terminal
Mutual induction

3. What does Ohm's Law represent?
Unlike poles attract
First digit
Relationship between current and potential difference
Ohms

4. Identify the blueprint symbol for resistors.
Volts
Tolerence
--^V^V^V^---
Silver

5. What is insulation resistance?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Potential difference
Solenoid and Relay(both A and B)
Electrical resistance against the flow of current

6. What is a characteristic of insulators?
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy
Opposition to electrical current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

7. What is dielectric strength?
75 Ohms
How much potential difference can a material withstand before breaking down
Use an effect to produce another effect
Silver

8. What information do the Left-Hand Rules provide?
Tolerence
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Ability to store an electric charge
Stores electrical charge

9. What are the two generic methods to eliminate static electricity from metal objects?
50 Ohms
Chemical action
Bonding and grounding
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

10. What is the purpose of resistors in electrical circuits?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Parallel
Produce heat - light - or limit current to control it(all of the above)
Potential difference

11. The generator is what method of creating potential energy?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
The relationship of potential difference to current
Electromagnetism

12. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Secondary cell
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Voltmeter

13. Which type of cell can be recharged?
Ohms
Secondary cell
Two
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

14. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Fixed - tapped - variable(all of the above)
Composition of the resistor
Alternating current
Electrical resistance against the flow of current

15. What determines whether a spark can be produced?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The direction the negative charge moves
Insulation resistance
Strength of the charge

16. How do static charges distribute themselves?
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)
1 watt
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The rate of doing work

17. What determines the resistance of a resistor?
Electrical resistance against the flow of current
Fixed - tapped - variable(all of the above)
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)
Composition of the resistor

18. What is the name for electrical resistance of insulation?
Electrical resistance against the flow of current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Insulation resistance
1/1000th of an inch

19. What is the term for two or more cells attached together?
20%
Battery
Heat
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

20. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Voltmeter
Potential difference - E*I - current times current change from point to point(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

21. What does a moving charge produce?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Energy
A magnetic field
The rate of doing work

22. When does a DC circuit oppose current flow?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Start with the band on the end and read to the center
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
The relationship of potential difference to current

23. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Resistance value can not be changed
Volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

24. What does an object have if a magnetic field acts on it?
Magnetic properties
DC current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
12 volts

25. When reading resistance color codes - what does the first band indicate?
First digit
--^V^V^V^---
Energy
Symbol

26. What is needed for electric heating elements and the filaments of light bulbs?
--^V^V^V^---
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)
High resistance
Strength of the charge

27. What is induction?
Solenoid and Relay(both A and B)
Wire splices
Current change in a coil creates a magnetic change
DC current

28. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Cables
Potential difference - E*I - current times current change from point to point(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

29. How is the heat production measured in a resistor?
Symbol
Ohms
Potential difference - E*I - current times current change from point to point(all of the above)
A magnetic field

30. What cannot be transformed to higher or lower potential differences?
DC current
Resistance increases as the conductor length increases
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)
1/1000th of an inch

31. What is a common cause of static electricity in a shop?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
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)
Moving vehicles
From the negative battery terminal to the positive terminal

32. What do we call the ability to do work?
Plastic - Rubber - Friction(all of the above)
First digit is 9
Opposition to electrical current
Energy

33. What is an electromagnet?
Solenoid and Relay(both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Grounding wire
Chemical action

34. What are the common units of measurement for round and square conductor cross - sections?
Resistance increases as the conductor length increases
Circular and square mills(Both A and B)
Bonding and grounding
Insulation resistance

35. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Magnetic properties
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
--^V^V^V^---

36. What is a common measure of wire diameter?
Heat
20%
Gauge number
Potential difference - E*I - current times current change from point to point(all of the above)

37. Identify the general blueprint symbol for inductors.
Insulation resistance
Mutual induction
Heat and current control(both a and c)
Symbol

38. How do you read resistor color codes?
Start with the band on the end and read to the center
Circular and square mills(Both A and B)
Relationship between current and potential difference
A magnetic field

39. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
First digit
1 watt
50 Ohms

40. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Volts
DC flows continuously in one direction and AC potential difference and current both change direction
Cell

41. What is a DC circuit characteristic?
Opposition to electrical current
Stranded
Current flows in one direction - potential differences across a load does not change(Both A and B)
20%

42. What results when current is run through a material with high resistance?
Cables
Heat and current control(both a and c)
A magnetic field
Bonding and grounding

43. 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
Cables
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Silver
75 Ohms

44. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
1 watt
Serial
50 Ohms
Relay

45. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Amperes
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Electrical resistance against the flow of current

46. What type of circuit has two or more paths for current to follow?
Two
Resistance increases as the conductor length increases
Opposes any change in the current flowing in a circuit
Parallel circuit

47. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Area and spacing of capacitor - static current in the capacitor(both A and B)

48. Identify the blueprint symbol for capacitors.
Voltage
Voltmeter
Insulation resistance and Dielectric strength(Both A and B)
Symbol

49. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
The direction of the magnetic field
Potential difference
Purging
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

50. What is resistance?
1/1000th of an inch
Unlike poles attract
Chemical action
Opposition to movement of free electrons

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