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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 the term for doing work at the rate of joule per second?
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)
1 watt
American wire gauge(AWG)
Stores electrical charge

2. What is the purpose of resistors in electrical circuits?
Fixed - tapped - variable(all of the above)
Chemical action
Electromagnetic field
Produce heat - light - or limit current to control it(all of the above)

3. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Use an effect to produce another effect
Cells can be connected together to make a battery
Amperes

4. What do electrical charges need to cause a fire or explosion?
5%
Porcelain
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10

5. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Breakdown voltage
Porcelain
First digit is 9

6. What is the term for two or more cells attached together?
Resistance increases as the conductor length increases
Wire splices
Battery
Alternating current

7. 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
A magnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
12 volts
10%

8. When does a DC circuit oppose current flow?
--^V^V^V^---
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)
Magnetic properties

9. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stranded
Common - not rechargable - gradually discharges when in storage(All of the above)
Grounding wire

10. What do junction boxes protect?
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)
First digit is 9
From the negative battery terminal to the positive terminal
Wire splices

11. What are the names of two of the six primary methods of producing a voltage?
Porcelain
--^V^V^V^---
Strength of the charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

12. What do transducers do in electrical terms?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
American wire gauge(AWG)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Use an effect to produce another effect

13. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Bonding and grounding
Secondary cell
Relay

14. Which way is the current going in the circuit shown?(electron flow)
Heat
Insulation resistance
From the negative battery terminal to the positive terminal
Electromagnetism

15. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Chemical action
Alternating current
Electromagnetism
Relay

16. What is true about a dry cell?
The direction the negative charge moves
Common - not rechargable - gradually discharges when in storage(All of the above)
Does not move
Insulation resistance

17. Identify the blueprint symbol for resistors.
Electromagnetic field
Solenoid and Relay(both A and B)
Plastic - Rubber - Friction(all of the above)
--^V^V^V^---

18. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Moving vehicles
Battery
10

19. What is the fundamental property of insulators?
Start with the band on the end and read to the center
Cables
Insulation resistance and Dielectric strength(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)

20. What is capacitance in electrical terms?
Choke
Ability to store an electric charge
Heat
Electromagnetic field

21. The thermocouple uses which method for creating potential energy?
Heat and current control(both a and c)
Voltage
Heat
Electromagnetic field

22. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Solenoid and Relay(both A and B)
Cables
20%
Alternating current

23. Why is the transformer important to AC electricity?

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24. What are the two generic methods to eliminate static electricity from metal objects?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Electrical resistance against the flow of current
Secondary cell
Bonding and grounding

25. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Stores electrical charge
Potential difference
Wire splices
Voltage

26. What does a third band of brown mean?
The relationship of potential difference to current
Magnetic properties
10
Fixed - Electrolytic - Variable(all of the above)

27. What is the relationship of conductor size and length to resistance?
Electromagnetism
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Plastic - Rubber - Friction(all of the above)
Resistance increases as the conductor length increases

28. What wire measurement is commonly used in the U.S.?
Current change in a coil creates a magnetic change
How much potential difference can a material withstand before breaking down
American wire gauge(AWG)
Bare - covered - insulated - stranded - cable(All of the above)

29. What cannot be transformed to higher or lower potential differences?
DC current
12 volts
Stores electrical charge
Relay

30. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
5%
Moving vehicles
High resistance

31. How many kinds of poles do magnets have?
Current change in a coil creates a magnetic change
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
Two

32. What is resistance in electrical terms?
Opposition to electrical current
Moving vehicles
Fixed - tapped - variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

33. What is the relationship between magnetism and electricity?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
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)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Stores electrical charge

34. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Solenoid and Relay(both A and B)
Volts
Cells can be connected together to make a battery

35. What is a common measure of wire diameter?
Gauge number
Does not move
Relationship between current and potential difference
The relationship of potential difference to current

36. What is another name for an inductor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Choke
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons

37. To what measurement do the conductor mills refer?
1/1000th of an inch
Ability to store an electric charge
American wire gauge(AWG)
DC current

38. What is the relationship between cells and batteries?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Cells can be connected together to make a battery
15 -000 ohms - 20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

39. What is a characteristic of a fixed resistor?
Resistance value can not be changed
20%
10
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

40. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Heat
Voltage
Volts

41. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
High resistance

42. What does resistance produce?
Heat
Opposes any change in the current flowing in a circuit
A magnetic field
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

43. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
DC flows continuously in one direction and AC potential difference and current both change direction
Fixed - Electrolytic - Variable(all of the above)
Bonding and grounding

44. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Produce heat - light - or limit current to control it(all of the above)
Ability to store an electric charge
Serial
12 volts

45. When reading resistance color codes - what does the first band indicate?
Porcelain
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Tolerence
First digit

46. Identify the general blueprint symbol for inductors.
From the negative battery terminal to the positive terminal
50 Ohms
Symbol
Series circuit

47. What is the purpose of a raceway?
Tolerence
Parallel
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Porcelain

48. How do you read resistor color codes?
Start with the band on the end and read to the center
12 volts
Symbol
Opposition to electrical current

49. What are the common units of measurement for round and square conductor cross - sections?
Solenoid and Relay(both A and B)
Symbol
Circular and square mills(Both A and B)
Composition of the resistor

50. What makes electrons flow?
The relationship of potential difference to current
Potential difference
Circular and square mills(Both A and B)
Breakdown voltage