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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 must be large enough to carry the largest current likely to occur?
Opposes any change in the current flowing in a circuit
Mutual induction
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Grounding wire

2. What is a characteristic of a fixed resistor?
Electrical resistance against the flow of current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Resistance value can not be changed
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

3. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Solenoid and Relay(both A and B)
Silver
Electromagnetism
Alternating current

4. What types of protective tapes are used?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Electrical resistance against the flow of current
First digit is 9
Plastic - Rubber - Friction(all of the above)

5. What is the basic law of magnetic force?
Alternating current
Heat
15 -000 ohms - 20%
Unlike poles attract

6. What is a way to classify wires and cables?
Potential difference
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
By their covering
First digit is 9

7. What makes electrons flow?
Potential difference
Bonding and grounding
Resistance increases as the conductor length increases
Stranded

8. What is a property of inductors in electrical circuits?
Serial
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10%
Opposes any change in the current flowing in a circuit

9. What determines whether a spark can be produced?
Potential difference
A difference in potential energy
Strength of the charge
1/1000th of an inch

10. What is a conductor?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Cables
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

11. What do junction boxes protect?
Series circuit
Volts
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)
Wire splices

12. The dry cell is what method for creating potential energy?
Purging
Bonding and grounding
Cell
Chemical action

13. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
DC current
Opposes any change in the current flowing in a circuit
Porcelain

14. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
DC flows continuously in one direction and AC potential difference and current both change direction
Mutual induction
First digit is 9
Gauge number

15. Which way is the current going in the circuit shown?(electron flow)
15 -000 ohms - 20%
A magnetic field
From the negative battery terminal to the positive terminal
First digit

16. How do you read resistor color codes?
Start with the band on the end and read to the center
Parallel circuit
12 volts
10

17. Identify the general blueprint symbol for inductors.
The direction the negative charge moves
10%
Symbol
Strength of the charge

18. How is capacitance determined?
Stranded
Volts
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

19. What is the purpose of capacitors in electrical circuits?
Does not move
1/1000th of an inch
Magnetic properties
Stores electrical charge

20. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
How much potential difference can a material withstand before breaking down
Composition of the resistor
Alternating current

21. What is induction?
Current change in a coil creates a magnetic change
The relationship of potential difference to current
10
Choke

22. To what measurement do the conductor mills refer?
Purging
Resistance increases as the conductor length increases
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
1/1000th of an inch

23. Where do the fingers point in both Left-Hand Rules?
Opposition to electrical current
Plastic - Rubber - Friction(all of the above)
The direction of the magnetic field
Voltmeter

24. What is the unit of measurement of potential difference?
10
Volts
Opposes any change in the current flowing in a circuit
10%

25. What are the names of two of the six primary methods of producing a voltage?
Potential difference
75 Ohms
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)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

26. What do transducers do in electrical terms?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Current change in a coil creates a magnetic change
Use an effect to produce another effect
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

27. What do electrical charges need to cause a fire or explosion?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Stores electrical charge
Insulation resistance and Dielectric strength(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

28. When does a DC circuit oppose current flow?
Magnetic properties
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
The direction of the magnetic field
Amperes

29. What is voltage?
Breakdown voltage
A difference in potential energy
By their covering
First digit

30. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Stranded
10%
Serial
How much potential difference can a material withstand before breaking down

31. What does a transformer transform?
Tolerence
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The relationship of potential difference to current
Porcelain

32. What is the fundamental property of insulators?
Secondary cell
Magnetic properties
Heat
Insulation resistance and Dielectric strength(Both A and B)

33. What is capacitance in electrical terms?
20%
Amperes
Insulation resistance
Ability to store an electric charge

34. What is another name for an inductor?
12 volts
Choke
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

35. Which material has the lowest resistance at ordinary temperatures?
Two
12 volts
Silver
Chemical action

36. What is a DC circuit characteristic?
Cells can be connected together to make a battery
Serial
Voltage
Current flows in one direction - potential differences across a load does not change(Both A and B)

37. What makes electrons flow?
The relationship of potential difference to current
Potential difference
A magnetic field
Symbol

38. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Energy
Potential difference
Serial
Breakdown voltage

39. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Resistance value can not be changed
Energy
--^V^V^V^---

40. 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
20%
Two
75 Ohms
Circular and square mills(Both A and B)

41. What is the unit of measurement of resistance?
1/1000th of an inch
Alternating current
Ohms
DC flows continuously in one direction and AC potential difference and current both change direction

42. What is the relationship of conductor size and length to resistance?
The relationship of potential difference to current
Secondary cell
Insulation resistance
Resistance increases as the conductor length increases

43. What wire measurement is commonly used in the U.S.?
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)
American wire gauge(AWG)
Two
Produce heat - light - or limit current to control it(all of the above)

44. What is dielectric strength?
Electrical resistance against the flow of current
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)
Energy
How much potential difference can a material withstand before breaking down

45. A resistor is color coded brown - green - orange. What is its resistance?
Symbol
Stores electrical charge
Current change in a coil creates a magnetic change
15 -000 ohms - 20%

46. What determines the resistance of a resistor?
Porcelain
DC flows continuously in one direction and AC potential difference and current both change direction
Heat
Composition of the resistor

47. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Energy
Purging
50 Ohms
Stores electrical charge

48. Which of the following is a type of resistor?
Composition of the resistor
Heat
Moving vehicles
Fixed - tapped - variable(all of the above)

49. What is a type of mechanical transducer?
Bare - covered - insulated - stranded - cable(All of the above)
Fixed - tapped - variable(all of the above)
Solenoid and Relay(both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

50. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Start with the band on the end and read to the center
Battery