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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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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 less than the lowest- value capacitor?
20%
Volts
Serial
Porcelain

2. Which material has the lowest resistance at ordinary temperatures?
A magnetic field
Relay
Composition of the resistor
Silver

3. What is the unit of measurement of electrical current?
From the negative battery terminal to the positive terminal
Amperes
1 watt
Potential difference - E*I - current times current change from point to point(all of the above)

4. 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
10%
12 volts
Fixed - Electrolytic - Variable(all of the above)
Tolerence

5. What is the fundamental property of insulators?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
10%
Plastic - Rubber - Friction(all of the above)

6. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Tolerence
Voltage
Heat
Ohms

7. What does a third band of brown mean?
Parallel circuit
10
Amperes
5%

8. What is the type of cable composed of many fine wires?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Stranded
Resistance increases as the conductor length increases
20%

9. Identify the blueprint symbol for capacitors.
The relationship of potential difference to current
Cells can be connected together to make a battery
Symbol
Use an effect to produce another effect

10. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Insulation resistance
10%
Common - not rechargable - gradually discharges when in storage(All of the above)

11. What is the difference between AC and DC?
DC 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)
Voltage
DC flows continuously in one direction and AC potential difference and current both change direction

12. Which way is the current going in the circuit shown?(electron flow)
Energy
Magnetic properties
Silver
From the negative battery terminal to the positive terminal

13. What is the purpose of capacitors in electrical circuits?
High resistance
Opposition to electrical current
Stores electrical charge
Choke

14. What is the term for two or more cells attached together?
The relationship of potential difference to current
Silver
How much potential difference can a material withstand before breaking down
Battery

15. What is the relationship between cells and batteries?
Ability to store an electric charge
Cells can be connected together to make a battery
10%
10

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

17. How do you read resistor color codes?
Opposition to movement of free electrons
Parallel
Alternating current
Start with the band on the end and read to the center

18. What is the purpose of resistors in electrical circuits?
A magnetic field
By their covering
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)

19. How is capacitance determined?
Stranded
Area and spacing of capacitor - static current in the capacitor(both A and B)
Heat and current control(both a and c)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

20. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Ability to store an electric charge
50 Ohms
Start with the band on the end and read to the center
The direction the negative charge moves

21. What is a common measure of wire diameter?
Purging
Current flows in one direction - potential differences across a load does not change(Both A and B)
Grounding wire
Gauge number

22. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Chemical action
The direction the negative charge moves
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

23. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Breakdown voltage

24. What does static electricity do?
Parallel
Does not move
Moving vehicles
Current flows in one direction - potential differences across a load does not change(Both A and B)

25. What is a common form used in conductors?
Potential difference - E*I - current times current change from point to point(all of the above)
Cables
75 Ohms
Series circuit

26. Identify the general blueprint symbol for inductors.
Opposition to movement of free electrons
Symbol
Heat
Solenoid and Relay(both A and B)

27. What is the relationship of conductor size and length to resistance?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Resistance increases as the conductor length increases
First digit is 9
5%

28. What is the relationship between magnetism and electricity?
Start with the band on the end and read to the center
Energy
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 relationship of potential difference to current

29. What does a moving charge produce?
A magnetic field
Resistance value can not be changed
First digit is 9
Area and spacing of capacitor - static current in the capacitor(both A and B)

30. What is an arrangement of materials that create a potential difference by chemistry?
Heat
The direction of the magnetic field
Cell
The rate of doing work

31. What is the name for electrical resistance of insulation?
Insulation resistance
Relationship between current and potential difference
Solenoid and Relay(both A and B)
How much potential difference can a material withstand before breaking down

32. What are the names of two of the six primary methods of producing a voltage?
DC flows continuously in one direction and AC potential difference and current both change direction
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Porcelain
Cables

33. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Ohms
5%
DC current

34. What is another name for an inductor?
Fixed - tapped - variable(all of the above)
Choke
Tolerence
Electromagnetic field

35. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Heat
20%
Volts

36. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy
Two
Serial

37. The thermocouple uses which method for creating potential energy?
The rate of doing work
Parallel circuit
Heat
Energy

38. What are the common units of measurement for round and square conductor cross - sections?
By their covering
Circular and square mills(Both A and B)
Opposition to electrical current
The relationship of potential difference to current

39. What do we call the ability to do work?
Battery
Energy
By their covering
Chemical action

40. What is a characteristic of insulators?
Breakdown voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Ohms
Purging

41. What is the basic law of magnetic force?
Cell
12 volts
Unlike poles attract
Does not move

42. What is the unit of measurement of resistance?
Ohms
Relay
5%
Mutual induction

43. What makes electrons flow?
Unlike poles attract
Cells can be connected together to make a battery
The relationship of potential difference to current
Potential difference

44. What is a rigid metal conduit?
Relationship between current and potential difference
Stranded
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Bonding and grounding

45. When reading resistance color codes - what does the fourth band indicate?
Opposition to electrical current
Stores electrical charge
Tolerence
Parallel circuit

46. Which of the following materials is NOT a good conductor?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Porcelain
Energy

47. What results when current is run through a material with high resistance?
Produce heat - light - or limit current to control it(all of the above)
Heat and current control(both a and c)
Purging
Current flows in one direction - potential differences across a load does not change(Both A and B)

48. What is the term for doing work at the rate of joule per second?
Solenoid and Relay(both A and B)
1 watt
Potential difference - E*I - current times current change from point to point(all of the above)
The rate of doing work

49. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
1/1000th of an inch
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Magnetic properties

50. What determines whether a spark can be produced?
Cables
Potential difference - E*I - current times current change from point to point(all of the above)
The rate of doing work
Strength of the charge

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Basic Electricity

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