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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. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
DC current
Parallel
Silver
15 -000 ohms - 20%

2. To what measurement do the conductor mills refer?
10%
1/1000th of an inch
Fixed - tapped - variable(all of the above)
12 volts

3. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A difference in potential energy
Potential difference
Voltmeter

4. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
1/1000th of an inch
10%
A difference in potential energy

5. When does a DC circuit oppose current flow?
Opposition to electrical current
The direction the negative charge moves
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Porcelain

6. In most applications - what remains constant if the current remains constant and flows in one direction?
From the negative battery terminal to the positive terminal
Heat
Electromagnetic field
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

7. How do static charges distribute themselves?
Potential difference
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
How much potential difference can a material withstand before breaking down
Stranded

8. What does a third band of brown mean?
12 volts
10
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Purging

9. What is the unit of measurement of electrical current?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
1 watt
Amperes

10. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Voltmeter
Fixed - tapped - variable(all of the above)
Breakdown voltage

11. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
10%
Circular and square mills(Both A and B)
Resistance value can not be changed

12. What does a moving charge produce?
Ohms
A magnetic field
Alternating current
Choke

13. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
1/1000th of an inch
Use an effect to produce another effect
20%
Ohms

14. When reading resistance color codes - what does the fourth band indicate?
Tolerence
The direction of the magnetic field
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Mutual induction

15. What is a way to classify wires and cables?
Common - not rechargable - gradually discharges when in storage(All of the above)
By their covering
Fixed - tapped - variable(all of the above)
Electromagnetic field

16. What is a common measure of wire diameter?
Gauge number
Heat and current control(both a and c)
Porcelain
High resistance

17. Which of the following materials is NOT a good conductor?
Porcelain
Solenoid and Relay(both A and B)
Cables
15 -000 ohms - 20%

18. What is a switch that operates by electricity?
Produce heat - light - or limit current to control it(all of the above)
Relay
Mutual induction
Gauge number

19. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
The direction of the magnetic field
5%
By their covering
Silver

20. What is the unit of measurement of potential difference?
The relationship of potential difference to current
Volts
Fixed - tapped - variable(all of the above)
Parallel

21. What is the purpose of a raceway?
Symbol
From the negative battery terminal to the positive terminal
Volts
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

22. What do we call the ability to do work?
Grounding wire
The rate of doing work
Energy
Moving vehicles

23. Which material has the lowest resistance at ordinary temperatures?
Silver
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)
The direction of the magnetic field
Potential difference

24. Why is the transformer important to AC electricity?

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25. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Volts
Cables
Electromagnetic field

26. What is the difference between AC and DC?
The direction of the magnetic field
DC flows continuously in one direction and AC potential difference and current both change direction
Alternating current
Bonding and grounding

27. What is voltage?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
A difference in potential energy
Ohms
Start with the band on the end and read to the center

28. What is the use of the electromagnet?
Potential difference - E*I - current times current change from point to point(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel circuit
Purging

29. What is a common form used in conductors?
Voltmeter
The rate of doing work
Cables
Use an effect to produce another effect

30. What is true about a dry cell?
Opposes any change in the current flowing in a circuit
Symbol
Volts
Common - not rechargable - gradually discharges when in storage(All of the above)

31. What makes electrons flow?
Stores electrical charge
50 Ohms
Opposes any change in the current flowing in a circuit
Potential difference

32. Where does the thumb point in both Left-Hand Rules?
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)
Ability to store an electric charge
The direction the negative charge moves
Heat

33. What does an object have if a magnetic field acts on it?
Stranded
Current flows in one direction - potential differences across a load does not change(Both A and B)
Magnetic properties
Electromagnetism

34. What is the name for electrical resistance of insulation?
American wire gauge(AWG)
Insulation resistance
15 -000 ohms - 20%
How much potential difference can a material withstand before breaking down

35. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Opposition to electrical current
Tolerence
First digit is 9

36. The generator is what method of creating potential energy?
Electromagnetism
10%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Ohms

37. What determines whether a spark can be produced?
How much potential difference can a material withstand before breaking down
First digit is 9
Strength of the charge
Resistance value can not be changed

38. What must be large enough to carry the largest current likely to occur?
Grounding wire
Start with the band on the end and read to the center
Battery
Stranded

39. What is a wire classification?
Chemical action
Bare - covered - insulated - stranded - cable(All of the above)
Tolerence
First digit

40. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Current change in a coil creates a magnetic change
Ohms
Serial
Cell

41. Which of the following is a type of resistor?
Circular and square mills(Both A and B)
Purging
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Fixed - tapped - variable(all of the above)

42. What do junction boxes protect?
Cells can be connected together to make a battery
Wire splices
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Electromagnetic field

43. What is the fundamental property of insulators?
Voltmeter
Insulation resistance and Dielectric strength(Both A and B)
Volts
--^V^V^V^---

44. 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
Ability to store an electric charge
75 Ohms
Cell
Opposition to movement of free electrons

45. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Ability to store an electric charge
Potential difference - E*I - current times current change from point to point(all of the above)
Opposition to electrical current

46. The thermocouple uses which method for creating potential energy?
A difference in potential energy
Relay
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Heat

47. What type of circuit has one path of follow through a load?
Two
Series circuit
Current change in a coil creates a magnetic change
A magnetic field

48. What is another name for an inductor?
Produce heat - light - or limit current to control it(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Choke
Secondary cell

49. What is the relationship between magnetism and electricity?
Voltmeter
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)
--^V^V^V^---
Heat

50. What is the purpose of resistors in electrical circuits?
1 watt
Ability to store an electric charge
Produce heat - light - or limit current to control it(all of the above)
10%