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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 property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Insulation resistance
The rate of doing work
5%

2. What is a characteristic of a fixed resistor?
Porcelain
Resistance value can not be changed
15 -000 ohms - 20%
Circular and square mills(Both A and B)

3. What is voltage?
A difference in potential energy
Resistance increases as the conductor length increases
Porcelain
Fixed - Electrolytic - Variable(all of the above)

4. What does an object have if a magnetic field acts on it?
Start with the band on the end and read to the center
Magnetic properties
The relationship of potential difference to current
1/1000th of an inch

5. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Wire splices
Purging
5%
Circular and square mills(Both A and B)

6. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
The direction of the magnetic field
Heat and current control(both a and c)
Cables

7. What is the name for electrical resistance of insulation?
Breakdown voltage
Insulation resistance
Heat
DC flows continuously in one direction and AC potential difference and current both change direction

8. Which type of cell can be recharged?
Circular and square mills(Both A and B)
Resistance increases as the conductor length increases
1/1000th of an inch
Secondary cell

9. What is power?
Current change in a coil creates a magnetic change
75 Ohms
The rate of doing work
Amperes

10. What is needed for electric heating elements and the filaments of light bulbs?
Symbol
Electrical resistance against the flow of current
High resistance
Unlike poles attract

11. What is a common cause of static electricity in a shop?
Bare - covered - insulated - stranded - cable(All of the above)
Moving vehicles
Purging
Does not move

12. Which way is the current going in the circuit shown?(electron flow)
Potential difference - E*I - current times current change from point to point(all of the above)
From the negative battery terminal to the positive terminal
Fixed - tapped - variable(all of the above)
Relay

13. What does resistance produce?
75 Ohms
Heat
Series circuit
Wire splices

14. To what measurement do the conductor mills refer?
First digit
Bonding and grounding
Tolerence
1/1000th of an inch

15. What is resistance in electrical terms?
Unlike poles attract
5%
Volts
Opposition to electrical current

16. What is capacitance in electrical terms?
Insulation resistance
Ability to store an electric charge
Fixed - tapped - variable(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

17. 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
Symbol
Does not move
75 Ohms
Grounding wire

18. Identify the blueprint symbol for resistors.
--^V^V^V^---
Resistance increases as the conductor length increases
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Solenoid and Relay(both A and B)

19. A resistor is color coded brown - green - orange. What is its resistance?
Produce heat - light - or limit current to control it(all of the above)
15 -000 ohms - 20%
First digit is 9
Relay

20. What is resistance?
Tolerence
10
Opposition to movement of free electrons
The direction of the magnetic field

21. What does a moving charge produce?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
--^V^V^V^---
Electromagnetism
A magnetic field

22. What is a common form used in conductors?
Volts
Voltage
75 Ohms
Cables

23. What is a rigid metal conduit?
Opposes any change in the current flowing in a circuit
First digit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Parallel

24. Where does the thumb point in both Left-Hand Rules?
Potential difference
The direction the negative charge moves
Electrical resistance against the flow of current
From the negative battery terminal to the positive terminal

25. What is insulation resistance?
Relay
From the negative battery terminal to the positive terminal
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)

26. What is dielectric strength?
Heat
Voltmeter
A difference in potential energy
How much potential difference can a material withstand before breaking down

27. Why is the transformer important to AC electricity?

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28. How do you read resistor color codes?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
From the negative battery terminal to the positive terminal
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Start with the band on the end and read to the center

29. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
The relationship of potential difference to current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

30. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Circular and square mills(Both A and B)
15 -000 ohms - 20%
Electromagnetic field

31. What does a first band of white mean?
Relationship between current and potential difference
Fixed - tapped - variable(all of the above)
Wire splices
First digit is 9

32. What is the term for two or more cells attached together?
American wire gauge(AWG)
Battery
Use an effect to produce another effect
Heat

33. What is the unit of measurement of resistance?
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)
Plastic - Rubber - Friction(all of the above)
Gauge number
Ohms

34. What do electrical charges need to cause a fire or explosion?
Ability to store an electric charge
Grounding wire
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetism

35. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
50 Ohms
Use an effect to produce another effect
Cables

36. What do we call the ability to do work?
Relationship between current and potential difference
Energy
Choke
Heat

37. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Amperes
Gauge number
Potential difference

38. How many kinds of poles do magnets have?
Ohms
Produce heat - light - or limit current to control it(all of the above)
Two
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

39. How is capacitance determined?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Produce heat - light - or limit current to control it(all of the above)

40. What is the relationship between magnetism and electricity?
Breakdown voltage
First digit
--^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)

41. What is the unit of measurement of electrical current?
12 volts
Relay
75 Ohms
Amperes

42. What do transducers do in electrical terms?
Use an effect to produce another effect
Common - not rechargable - gradually discharges when in storage(All of the above)
Series circuit
15 -000 ohms - 20%

43. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Resistance increases as the conductor length increases
Opposition to movement of free electrons
First digit

44. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Bare - covered - insulated - stranded - cable(All of the above)
Cables
Composition of the resistor

45. In most applications - what remains constant if the current remains constant and flows in one direction?
Current change in a coil creates a magnetic change
Electromagnetic field
Cell
5%

46. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Strength of the charge
Current change in a coil creates a magnetic change
By their covering

47. What is the measure of potential difference?
Volts
High resistance
Parallel circuit
Unlike poles attract

48. How is the heat production measured in a resistor?
10%
Unlike poles attract
Potential difference - E*I - current times current change from point to point(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

49. What is the use of the electromagnet?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Stranded
Heat
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

50. What is the purpose of resistors in electrical circuits?
Ohms
10%
Circular and square mills(Both A and B)
Produce heat - light - or limit current to control it(all of the above)