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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 is a characteristic of a fixed resistor?
Cell
Resistance value can not be changed
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

2. What is an arrangement of materials that create a potential difference by chemistry?
Breakdown voltage
Magnetic properties
Cell
Amperes

3. What is an electromagnet?
10
Wire splices
20%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

4. What information do the Left-Hand Rules provide?
Serial
Parallel
A difference in potential energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

5. What is the unit of measurement of potential difference?
Battery
Purging
Volts
The relationship of potential difference to current

6. What must be large enough to carry the largest current likely to occur?
Parallel
Cells can be connected together to make a battery
Grounding wire
5%

7. What does a third band of brown mean?
Moving vehicles
Relay
10
American wire gauge(AWG)

8. A resistor is color coded brown - green - orange. What is its resistance?
Cell
15 -000 ohms - 20%
Current change in a coil creates a magnetic change
Voltage

9. 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)
Wire splices
American wire gauge(AWG)
Composition of the resistor

10. What does resistance produce?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Choke
--^V^V^V^---
Heat

11. 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
Electromagnetism
Cell
Opposition to electrical current
75 Ohms

12. What is the relationship between magnetism and electricity?
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)
The direction the negative charge moves
1/1000th of an inch
5%

13. Which of the following materials is NOT a good conductor?
Porcelain
Resistance value can not be changed
Opposes any change in the current flowing in a circuit
Current change in a coil creates a magnetic change

14. How do static charges distribute themselves?
Use an effect to produce another effect
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
First digit
1 watt

15. How many kinds of poles do magnets have?
Two
The direction of the magnetic field
Wire splices
From the negative battery terminal to the positive terminal

16. What is a characteristic of insulators?
Grounding wire
The direction of the magnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

17. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
American wire gauge(AWG)
20%
Opposes any change in the current flowing in a circuit

18. What results when current is run through a material with high resistance?
Silver
Resistance increases as the conductor length increases
50 Ohms
Heat and current control(both a and c)

19. Why is the transformer important to AC electricity?

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20. In most applications - what remains constant if the current remains constant and flows in one direction?
Bonding and grounding
A magnetic field
A difference in potential energy
Electromagnetic field

21. To what measurement do the conductor mills refer?
1/1000th of an inch
Heat and current control(both a and c)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Voltmeter

22. What makes electrons flow?
Heat
From the negative battery terminal to the positive terminal
Opposition to movement of free electrons
Potential difference

23. What is another name for an inductor?
By their covering
Choke
American wire gauge(AWG)
A difference in potential energy

24. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Heat and current control(both a and c)
75 Ohms
Use an effect to produce another effect
20%

25. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Insulation resistance and Dielectric strength(Both A and B)
Relationship between current and potential difference
Parallel

26. What do we call the ability to do work?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy
High resistance
Cables

27. What is a type of mechanical transducer?
Relay
Heat and current control(both a and c)
Moving vehicles
Solenoid and Relay(both A and B)

28. What is dielectric strength?
--^V^V^V^---
How much potential difference can a material withstand before breaking down
20%
Ohms

29. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Alternating current
Purging
Energy
50 Ohms

30. Identify the blueprint symbol for resistors.
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Parallel circuit
How much potential difference can a material withstand before breaking down
--^V^V^V^---

31. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Electrical resistance against the flow of current
Potential difference
From the negative battery terminal to the positive terminal

32. What is the measure of potential difference?
Battery
Volts
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Parallel

33. What instrument measures voltage?
Wire splices
1 watt
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltmeter

34. Which material has the lowest resistance at ordinary temperatures?
Silver
Serial
Energy
Electromagnetism

35. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Relay
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Volts

36. What is the unit of measurement of resistance?
Ohms
12 volts
From the negative battery terminal to the positive terminal
Potential difference

37. What is the name for electrical resistance of insulation?
12 volts
Insulation resistance
Symbol
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

38. What is power?
The rate of doing work
Voltmeter
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)
Resistance increases as the conductor length increases

39. Where does the thumb point in both Left-Hand Rules?
12 volts
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
The direction the negative charge moves
Secondary cell

40. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Bonding and grounding
The relationship of potential difference to current
Solenoid and Relay(both A and B)

41. What do junction boxes protect?
Electromagnetism
Wire splices
Unlike poles attract
Tolerence

42. What is the type of cable composed of many fine wires?
The relationship of potential difference to current
Stranded
Composition of the resistor
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

43. What makes electrons flow?
Potential difference
Plastic - Rubber - Friction(all of the above)
Heat
First digit

44. What is insulation resistance?
First digit is 9
Voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Electrical resistance against the flow of current

45. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Voltage
Use an effect to produce another effect

46. What is the use of the electromagnet?
Alternating current
1 watt
Silver
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

47. What wire measurement is commonly used in the U.S.?
Insulation resistance and Dielectric strength(Both A and B)
20%
Opposition to electrical current
American wire gauge(AWG)

48. What is a switch that operates by electricity?
Amperes
Relay
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)

49. Where do the fingers point in both Left-Hand Rules?
Choke
The direction of the magnetic field
50 Ohms
Current change in a coil creates a magnetic change

50. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge
10
Battery