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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. When does a DC circuit oppose current flow?
Current flows in one direction - potential differences across a load does not change(Both A and B)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Circular and square mills(Both A and B)
Relationship between current and potential difference

2. What are the two generic methods to eliminate static electricity from metal objects?
Produce heat - light - or limit current to control it(all of the above)
Bonding and grounding
Voltmeter
Insulation resistance and Dielectric strength(Both A and B)

3. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
The relationship of potential difference to current

4. What is a conductor?
Serial
Moving vehicles
Unlike poles attract
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

5. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Alternating current
How much potential difference can a material withstand before breaking down
Purging
Chemical action

6. The dry cell is what method for creating potential energy?
Series circuit
Common - not rechargable - gradually discharges when in storage(All of the above)
Chemical action
Stranded

7. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Two
Voltage

8. What does a moving charge produce?
A magnetic field
Battery
Strength of the charge
Alternating current

9. 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
Volts
A magnetic field

10. What is a way to classify wires and cables?
Potential difference
Mutual induction
By their covering
Cables

11. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Relay
Opposes any change in the current flowing in a circuit
20%
Area and spacing of capacitor - static current in the capacitor(both A and B)

12. 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
75 Ohms
20%
Choke
From the negative battery terminal to the positive terminal

13. What is dielectric strength?
--^V^V^V^---
Mutual induction
First digit
How much potential difference can a material withstand before breaking down

14. What are the names of two of the six primary methods of producing a voltage?
From the negative battery terminal to the positive terminal
Relay
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The relationship of potential difference to current

15. Which of the following is a type of resistor?
Chemical action
Fixed - tapped - variable(all of the above)
Choke
Unlike poles attract

16. What is the basic law of magnetic force?
Silver
Unlike poles attract
Potential difference
Solenoid and Relay(both A and B)

17. What is another name for an inductor?
Battery
Secondary cell
Choke
Electrical resistance against the flow of current

18. What does an object have if a magnetic field acts on it?
Volts
Magnetic properties
Chemical action
10

19. What is the term for doing work at the rate of joule per second?
Relay
How much potential difference can a material withstand before breaking down
1 watt
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

20. What type of circuit has two or more paths for current to follow?
Parallel circuit
DC current
Chemical action
Unlike poles attract

21. Identify the blueprint symbol for resistors.
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
--^V^V^V^---
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Solenoid and Relay(both A and B)

22. Why is the transformer important to AC electricity?

23. What is resistance in electrical terms?
Opposition to electrical current
Series circuit
Heat
Potential difference

24. What is the relationship of conductor size and length to resistance?
Electrical resistance against the flow of current
Battery
Produce heat - light - or limit current to control it(all of the above)
Resistance increases as the conductor length increases

25. To what measurement do the conductor mills refer?
20%
1/1000th of an inch
Bare - covered - insulated - stranded - cable(All of the above)
Fixed - tapped - variable(all of the above)

26. What is a switch that operates by electricity?
Relay
Voltmeter
Volts
15 -000 ohms - 20%

27. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Serial
Resistance increases as the conductor length increases

28. What is the name for electrical resistance of insulation?
Secondary cell
Area and spacing of capacitor - static current in the capacitor(both A and B)
Energy
Insulation resistance

29. How is capacitance determined?
Alternating current
DC current
Tolerence
Area and spacing of capacitor - static current in the capacitor(both A and B)

30. What is resistance?
Bare - covered - insulated - stranded - cable(All of the above)
Volts
1 watt
Opposition to movement of free electrons

31. What does Ohm's Law represent?
10%
Gauge number
Relationship between current and potential difference
Symbol

32. What is the purpose of a raceway?
Amperes
The relationship of potential difference to current
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)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

33. Where do the fingers point in both Left-Hand Rules?
Series circuit
The direction of the magnetic field
Plastic - Rubber - Friction(all of the above)
Heat and current control(both a and c)

34. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Current flows in one direction - potential differences across a load does not change(Both A and B)
Volts
Cables

35. Which of the following materials is NOT a good conductor?
American wire gauge(AWG)
Opposition to movement of free electrons
5%
Porcelain

36. How do static charges distribute themselves?
Heat and current control(both a and c)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Mutual induction
First digit is 9

37. What is induction?
Ohms
10
Current change in a coil creates a magnetic change
Bare - covered - insulated - stranded - cable(All of the above)

38. What is the type of cable composed of many fine wires?
Stranded
Electromagnetism
By their covering
Silver

39. What is the relationship between magnetism and electricity?
DC flows continuously in one direction and AC potential difference and current both change direction
Moving vehicles
Resistance value can not be changed
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)

40. What cannot be transformed to higher or lower potential differences?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Composition of the resistor
DC current
Grounding wire

41. What does static electricity do?
Strength of the charge
12 volts
Does not move
Symbol

42. Given E=I X R and the following information - plug in the data and solve the problem for voltage. 0.015 ohms - 800 amps of current
12 volts
Opposition to electrical current
Bare - covered - insulated - stranded - cable(All of the above)
5%

43. What do we call the ability to do work?
Bare - covered - insulated - stranded - cable(All of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Relationship between current and potential difference
Energy

44. What is a DC circuit characteristic?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Porcelain
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

45. What is the term for two or more cells attached together?
Alternating current
Resistance increases as the conductor length increases
Battery
Secondary cell

46. How do you read resistor color codes?
Insulation resistance and Dielectric strength(Both A and B)
Opposition to electrical current
5%
Start with the band on the end and read to the center

47. What is a common measure of wire diameter?
Grounding wire
Gauge number
Opposition to electrical current
Stores electrical charge

48. 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)
Volts
10%
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

49. What is insulation resistance?
Electrical resistance against the flow of current
Opposition to electrical current
Resistance increases as the conductor length increases
10%

50. What is power?
The rate of doing work
Heat
A magnetic field
A difference in potential energy