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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 are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Stores electrical charge
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Composition of the resistor

2. What is a switch that operates by electricity?
Relay
Start with the band on the end and read to the center
Tolerence
Solenoid and Relay(both A and B)

3. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Parallel circuit
10%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Start with the band on the end and read to the center

4. What are the names of two of the six primary methods of producing a voltage?
Fixed - Electrolytic - Variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Symbol

5. 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
Series circuit
Choke
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

6. A resistor is color coded brown - green - orange. What is its resistance?
Resistance increases as the conductor length increases
Insulation resistance
15 -000 ohms - 20%
10%

7. What is a common form used in conductors?
Cables
A magnetic field
Breakdown voltage
Wire splices

8. What do we call the ability to do work?
75 Ohms
Cables
10%
Energy

9. How many kinds of poles do magnets have?
Two
High resistance
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

10. What is a characteristic of insulators?
Purging
Ability to store an electric charge
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Mutual induction

11. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Parallel
20%
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)

12. What is insulation resistance?
Tolerence
Electrical resistance against the flow of current
By their covering
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

13. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Grounding wire
Porcelain
Series circuit

14. What do junction boxes protect?
The direction the negative charge moves
Wire splices
A magnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

15. What wire measurement is commonly used in the U.S.?
Relationship between current and potential difference
American wire gauge(AWG)
Heat
Voltmeter

16. What instrument measures voltage?
Voltage
From the negative battery terminal to the positive terminal
Voltmeter
15 -000 ohms - 20%

17. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Plastic - Rubber - Friction(all of the above)
Bonding and grounding
Cells can be connected together to make a battery

18. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
The rate of doing work
Resistance increases as the conductor length increases
Gauge number

19. What is needed for electric heating elements and the filaments of light bulbs?
Composition of the resistor
DC flows continuously in one direction and AC potential difference and current both change direction
High resistance
Volts

20. What is power?
American wire gauge(AWG)
Circular and square mills(Both A and B)
Tolerence
The rate of doing work

21. What is a DC circuit characteristic?
Ability to store an electric charge
A magnetic field
Opposition to movement of free electrons
Current flows in one direction - potential differences across a load does not change(Both A and B)

22. What are the two generic methods to eliminate static electricity from metal objects?
Heat and current control(both a and c)
Stores electrical charge
The relationship of potential difference to current
Bonding and grounding

23. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Electrical resistance against the flow of current
1/1000th of an inch
First digit is 9

24. What determines the resistance of a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
First digit is 9
Composition of the resistor
Chemical action

25. Which material has the lowest resistance at ordinary temperatures?
Silver
Symbol
American wire gauge(AWG)
1 watt

26. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Ohms
15 -000 ohms - 20%
Alternating current
Area and spacing of capacitor - static current in the capacitor(both A and B)

27. Where do the fingers point in both Left-Hand Rules?
Serial
The direction of the magnetic field
Two
The relationship of potential difference to current

28. What is the purpose of a raceway?
15 -000 ohms - 20%
Start with the band on the end and read to the center
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Ability to store an electric charge

29. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Alternating current
Resistance value can not be changed
Cells can be connected together to make a battery

30. Identify the blueprint symbol for resistors.
--^V^V^V^---
Moving vehicles
A difference in potential energy
5%

31. What is dielectric strength?
Serial
Does not move
By their covering
How much potential difference can a material withstand before breaking down

32. How do you read resistor color codes?
Bonding and grounding
Start with the band on the end and read to the center
Voltmeter
Produce heat - light - or limit current to control it(all of the above)

33. What is an arrangement of materials that create a potential difference by chemistry?
Electromagnetism
Use an effect to produce another effect
Cell
Circular and square mills(Both A and B)

34. What is an electromagnet?
Produce heat - light - or limit current to control it(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC flows continuously in one direction and AC potential difference and current both change direction

35. What makes electrons flow?
The rate of doing work
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference
Heat

36. When does a DC circuit oppose current flow?
Resistance value can not be changed
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Voltmeter
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)

37. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Battery
12 volts
Volts

38. Why is the transformer important to AC electricity?

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39. What does an object have if a magnetic field acts on it?
Opposition to movement of free electrons
Volts
High resistance
Magnetic properties

40. Which type of cell can be recharged?
DC current
How much potential difference can a material withstand before breaking down
Secondary cell
Gauge number

41. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
American wire gauge(AWG)
Does not move
Current change in a coil creates a magnetic change

42. What does a transformer transform?
Magnetic properties
The relationship of potential difference to current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Purging

43. How is the heat production measured in a resistor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Plastic - Rubber - Friction(all of the above)
Choke
Potential difference - E*I - current times current change from point to point(all of the above)

44. What is the relationship of conductor size and length to resistance?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A difference in potential energy
Parallel
Resistance increases as the conductor length increases

45. What is the purpose of resistors in electrical circuits?
Opposes any change in the current flowing in a circuit
Produce heat - light - or limit current to control it(all of the above)
Opposition to electrical current
Parallel circuit

46. What is a common measure of wire diameter?
5%
Gauge number
Electromagnetism
American wire gauge(AWG)

47. What makes electrons flow?
Amperes
Ohms
Potential difference
Resistance value can not be changed

48. What does static electricity do?
Heat
Does not move
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Insulation resistance

49. What determines whether a spark can be produced?
Symbol
Strength of the charge
Choke
Two

50. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Wire splices
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Choke