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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 common measure of wire diameter?
Resistance value can not be changed
Gauge number
A difference in potential energy
50 Ohms

2. What is the relationship of conductor size and length to resistance?
The relationship of potential difference to current
Resistance increases as the conductor length increases
Parallel circuit
Ability to store an electric charge

3. What can permanently break down a capacitor?
Breakdown voltage
Area and spacing of capacitor - static current in the capacitor(both A and B)
Two
By their covering

4. What must be large enough to carry the largest current likely to occur?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Grounding wire
DC flows continuously in one direction and AC potential difference and current both change direction
Relay

5. What is another name for an inductor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Voltage
1/1000th of an inch
Choke

6. Which type of cell can be recharged?
Volts
Mutual induction
Solenoid and Relay(both A and B)
Secondary cell

7. What do electrical charges need to cause a fire or explosion?
Common - not rechargable - gradually discharges when in storage(All of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The relationship of potential difference to current
First digit is 9

8. What is voltage?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A difference in potential energy
Fixed - tapped - variable(all of the above)
From the negative battery terminal to the positive terminal

9. How do you read resistor color codes?
Purging
Potential difference
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

10. What is a switch that operates by electricity?
Relay
Plastic - Rubber - Friction(all of the above)
Tolerence
Choke

11. Identify the general blueprint symbol for inductors.
Volts
10%
Unlike poles attract
Symbol

12. What wire measurement is commonly used in the U.S.?
DC flows continuously in one direction and AC potential difference and current both change direction
The relationship of potential difference to current
American wire gauge(AWG)
A magnetic field

13. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Start with the band on the end and read to the center
Gauge number

14. What is the purpose of a raceway?
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)
20%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
How much potential difference can a material withstand before breaking down

15. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Potential difference - E*I - current times current change from point to point(all of the above)
10
12 volts

16. What is power?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The rate of doing work
Relationship between current and potential difference
Chemical action

17. When reading resistance color codes - what does the fourth band indicate?
Volts
Tolerence
The rate of doing work
Fixed - Electrolytic - Variable(all of the above)

18. Identify the blueprint symbol for resistors.
--^V^V^V^---
The relationship of potential difference to current
Fixed - Electrolytic - Variable(all of the above)
Strength of the charge

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
Does not move
Unlike poles attract
75 Ohms
Bonding and grounding

20. What is the relationship between cells and batteries?
Magnetic properties
Start with the band on the end and read to the center
Cells can be connected together to make a battery
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

21. The thermocouple uses which method for creating potential energy?
Heat
10
Amperes
Series circuit

22. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Volts
Potential difference
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

23. What instrument measures voltage?
Voltmeter
First digit is 9
Current flows in one direction - potential differences across a load does not change(Both A and B)
A difference in potential energy

24. What does a first band of white mean?
Insulation resistance and Dielectric strength(Both A and B)
First digit
DC flows continuously in one direction and AC potential difference and current both change direction
First digit is 9

25. What type of circuit has one path of follow through a load?
Series circuit
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Produce heat - light - or limit current to control it(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

26. What determines the resistance of a resistor?
Energy
High resistance
Fixed - tapped - variable(all of the above)
Composition of the resistor

27. What do junction boxes protect?
Relationship between current and potential difference
Alternating current
Current change in a coil creates a magnetic change
Wire splices

28. What is the term for doing work at the rate of joule per second?
Heat
Porcelain
Cell
1 watt

29. What is a characteristic of a fixed resistor?
75 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Resistance value can not be changed

30. The generator is what method of creating potential energy?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Electromagnetism
The rate of doing work
High resistance

31. What is the type of cable composed of many fine wires?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Circular and square mills(Both A and B)
Heat
Stranded

32. What are the two generic methods to eliminate static electricity from metal objects?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Bonding and grounding
The rate of doing work
From the negative battery terminal to the positive terminal

33. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Symbol
1 watt
Purging
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

34. How is the heat production measured in a resistor?
Secondary cell
Potential difference - E*I - current times current change from point to point(all of the above)
10
Insulation resistance

35. What does Ohm's Law represent?
Common - not rechargable - gradually discharges when in storage(All of the above)
Voltmeter
Relationship between current and potential difference
Bare - covered - insulated - stranded - cable(All of the above)

36. What does static electricity do?
First digit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Does not move

37. What is the purpose of capacitors in electrical circuits?
75 Ohms
1/1000th of an inch
Parallel circuit
Stores electrical charge

38. What is a type of mechanical transducer?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel circuit
Solenoid and Relay(both A and B)
Mutual induction

39. What does a third band of brown mean?
Potential difference
10
Heat
Current flows in one direction - potential differences across a load does not change(Both A and B)

40. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Relay
10%
Area and spacing of capacitor - static current in the capacitor(both A and B)
20%

41. What is capacitance in electrical terms?
Serial
Potential difference
Ability to store an electric charge
American wire gauge(AWG)

42. What is the unit of measurement of resistance?
Ohms
Unlike poles attract
Resistance increases as the conductor length increases
Symbol

43. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
By their covering
Tolerence
Bonding and grounding

44. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Relationship between current and potential difference
Mutual induction
Porcelain

45. In most applications - what remains constant if the current remains constant and flows in one direction?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Plastic - Rubber - Friction(all of the above)
Strength of the charge
Electromagnetic field

46. What is a characteristic of insulators?
Amperes
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
From the negative battery terminal to the positive terminal
Plastic - Rubber - Friction(all of the above)

47. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Tolerence
Current change in a coil creates a magnetic change
Alternating current
Bare - covered - insulated - stranded - cable(All of the above)

48. What is a common cause of static electricity in a shop?
Moving vehicles
Start with the band on the end and read to the center
Heat
Resistance value can not be changed

49. Where do the fingers point in both Left-Hand Rules?
Series circuit
Chemical action
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction of the magnetic field

50. Which of the following is a type of resistor?
First digit
Fixed - tapped - variable(all of the above)
5%
20%