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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 insulation resistance?
Electrical resistance against the flow of current
Potential difference
Symbol
DC flows continuously in one direction and AC potential difference and current both change direction

2. What is another name for an inductor?
Choke
Secondary cell
75 Ohms
Fixed - Electrolytic - Variable(all of the above)

3. What does a transformer transform?
Opposition to electrical current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The relationship of potential difference to current
American wire gauge(AWG)

4. What is the unit of measurement of resistance?
Serial
Ohms
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Battery

5. To what measurement do the conductor mills refer?
Unlike poles attract
1/1000th of an inch
Electromagnetism
How much potential difference can a material withstand before breaking down

6. What results when current is run through a material with high resistance?
Ohms
Heat and current control(both a and c)
10
Solenoid and Relay(both A and B)

7. What does resistance produce?
Symbol
Heat
Parallel circuit
A magnetic field

8. What is resistance?
Current change in a coil creates a magnetic change
Opposition to movement of free electrons
Insulation resistance and Dielectric strength(Both A and B)
Opposition to electrical current

9. What is a rigid metal conduit?
Does not move
Solenoid and Relay(both A and B)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Insulation resistance

10. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
15 -000 ohms - 20%
Energy
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

11. What is the unit of measurement of electrical current?
Amperes
Silver
Unlike poles attract
Solenoid and Relay(both A and B)

12. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Cell
10%
Voltmeter
Energy

13. When reading resistance color codes - what does the fourth band indicate?
Fixed - Electrolytic - Variable(all of the above)
Porcelain
Tolerence
Strength of the charge

14. 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)
Alternating current
Serial
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

15. What do junction boxes protect?
Moving vehicles
The direction of the magnetic field
Wire splices
Electromagnetism

16. What is the difference between AC and DC?
Does not move
DC flows continuously in one direction and AC potential difference and current both change direction
Symbol
10

17. What is a common cause of static electricity in a shop?
Relay
Moving vehicles
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
5%

18. What is a switch that operates by electricity?
1/1000th of an inch
Voltmeter
Relay
Potential difference

19. 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
Serial
75 Ohms
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cells can be connected together to make a battery

20. What does a first band of white mean?
12 volts
Heat
First digit is 9
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

21. How do static charges distribute themselves?
Breakdown voltage
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The rate of doing work
Strength of the charge

22. What is power?
Grounding wire
The rate of doing work
Symbol
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

23. What is true about a dry cell?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Bonding and grounding
From the negative battery terminal to the positive terminal
Common - not rechargable - gradually discharges when in storage(All of the above)

24. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Potential difference
By their covering
Serial
Cables

25. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Grounding wire
Alternating current
Use an effect to produce another effect
Moving vehicles

26. Why is the transformer important to AC electricity?

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27. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms
Series circuit
DC flows continuously in one direction and AC potential difference and current both change direction

28. What cannot be transformed to higher or lower potential differences?
Heat
DC current
The direction of the magnetic field
Electrical resistance against the flow of current

29. What types of protective tapes are used?
Cables
Plastic - Rubber - Friction(all of the above)
Purging
Stores electrical charge

30. Identify the blueprint symbol for resistors.
--^V^V^V^---
Secondary cell
Relay
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

31. How many kinds of poles do magnets have?
Parallel circuit
Two
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)
Solenoid and Relay(both A and B)

32. Which of the following materials is NOT a good conductor?
Electrical resistance against the flow of current
Tolerence
Porcelain
From the negative battery terminal to the positive terminal

33. What does Ohm's Law represent?
Relationship between current and potential difference
Potential difference
Symbol
Electromagnetic field

34. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Cell
Produce heat - light - or limit current to control it(all of the above)
Breakdown voltage
20%

35. What are the names of two of the six primary methods of producing a voltage?
Choke
10
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Amperes

36. In most applications - what remains constant if the current remains constant and flows in one direction?
Relay
Potential difference
Electromagnetic field
Stores electrical charge

37. The dry cell is what method for creating potential energy?
Two
Serial
Chemical action
Cell

38. What is capacitance in electrical terms?
50 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Ability to store an electric charge
Symbol

39. What does an object have if a magnetic field acts on it?
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy
Magnetic properties
Fixed - Electrolytic - Variable(all of the above)

40. What is an arrangement of materials that create a potential difference by chemistry?
Insulation resistance and Dielectric strength(Both A and B)
Cell
Volts
Potential difference

41. What are the two generic methods to eliminate static electricity from metal objects?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Current change in a coil creates a magnetic change
Bonding and grounding
First digit

42. What must be large enough to carry the largest current likely to occur?
Grounding wire
Symbol
The direction the negative charge moves
Stores electrical charge

43. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Heat
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference

44. What is the use of the electromagnet?
Serial
Ohms
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
DC current

45. What is resistance in electrical terms?
Opposition to electrical current
Bonding and grounding
Serial
Cells can be connected together to make a battery

46. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
The relationship of potential difference to current
By their covering
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Parallel

47. What is the purpose of capacitors in electrical circuits?
Breakdown voltage
First digit
Stores electrical charge
Grounding wire

48. 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)
Opposition to movement of free electrons
Ohms
Mutual induction

49. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
The direction of the magnetic field
Solenoid and Relay(both A and B)
The relationship of potential difference to current

50. What does a moving charge produce?
A magnetic field
Secondary cell
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
The rate of doing work