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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 less than the lowest- value capacitor?
Serial
The rate of doing work
Resistance increases as the conductor length increases
20%

2. What is dielectric strength?
Produce heat - light - or limit current to control it(all of the above)
Bonding and grounding
How much potential difference can a material withstand before breaking down
1 watt

3. What is the difference between AC and DC?
12 volts
75 Ohms
DC flows continuously in one direction and AC potential difference and current both change direction
Silver

4. What is a wire classification?
Volts
The rate of doing work
Bare - covered - insulated - stranded - cable(All of the above)
Electromagnetic field

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
A magnetic field
Start with the band on the end and read to the center
Use an effect to produce another effect
12 volts

6. What does static electricity do?
Parallel circuit
Does not move
12 volts
DC current

7. How is the heat production measured in a resistor?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Volts
Ohms

8. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Parallel
Silver
The rate of doing work
20%

9. What is needed for electric heating elements and the filaments of light bulbs?
The direction the negative charge moves
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)
Plastic - Rubber - Friction(all of the above)
High resistance

10. What is resistance?
Two
Relationship between current and potential difference
Amperes
Opposition to movement of free electrons

11. What does a moving charge produce?
A magnetic field
First digit
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Stranded

12. What do transducers do in electrical terms?
Cables
Wire splices
Use an effect to produce another effect
Series circuit

13. Which way is the current going in the circuit shown?(electron flow)
Opposition to electrical current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Electromagnetic field
From the negative battery terminal to the positive terminal

14. What is a common measure of wire diameter?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Gauge number
Volts
By their covering

15. What is voltage?
How much potential difference can a material withstand before breaking down
A difference in potential energy
American wire gauge(AWG)
Current change in a coil creates a magnetic change

16. Which of the following materials is NOT a good conductor?
Porcelain
75 Ohms
20%
Parallel circuit

17. What is a characteristic of a fixed resistor?
10
Composition of the resistor
Ability to store an electric charge
Resistance value can not be changed

18. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Chemical action
Secondary cell
Ability to store an electric charge

19. Why is the transformer important to AC electricity?

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20. What is the purpose of capacitors in electrical circuits?
Potential difference
Composition of the resistor
Volts
Stores electrical charge

21. 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
Resistance increases as the conductor length increases
Electromagnetism
Resistance value can not be changed

22. What is the unit of measurement of potential difference?
Fixed - Electrolytic - Variable(all of the above)
Volts
A magnetic field
The rate of doing work

23. What are the names of two of the six primary methods of producing a voltage?
Circular and square mills(Both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Ohms

24. Identify the blueprint symbol for capacitors.
Unlike poles attract
Stores electrical charge
The rate of doing work
Symbol

25. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat
Opposition to electrical current

26. What can permanently break down a capacitor?
Solenoid and Relay(both A and B)
Heat
Breakdown voltage
Bonding and grounding

27. What is the purpose of a raceway?
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)
Does not move
10%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

28. What do junction boxes protect?
The relationship of potential difference to current
Wire splices
First digit is 9
Heat

29. Where do the fingers point in both Left-Hand Rules?
Chemical action
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
Volts

30. What is the measure of potential difference?
Plastic - Rubber - Friction(all of the above)
Volts
The direction the negative charge moves
1 watt

31. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
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)
Insulation resistance
5%
First digit is 9

32. How do you read resistor color codes?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Symbol
Start with the band on the end and read to the center

33. What is the unit of measurement of resistance?
12 volts
Breakdown voltage
Ohms
Produce heat - light - or limit current to control it(all of the above)

34. What is the relationship of conductor size and length to resistance?
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Resistance increases as the conductor length increases

35. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Tolerence
A difference in potential energy

36. What is a common cause of static electricity in a shop?
Current change in a coil creates a magnetic change
Secondary cell
Grounding wire
Moving vehicles

37. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Two
Current flows in one direction - potential differences across a load does not change(Both A and B)
1/1000th of an inch

38. What is power?
Bonding and grounding
Volts
Battery
The rate of doing work

39. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)
Electrical resistance against the flow of current

40. What is the use of the electromagnet?
Grounding wire
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The direction of the magnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)

41. 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)
Volts
Stores electrical charge

42. What is a conductor?
Amperes
The rate of doing work
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Choke

43. What does Ohm's Law represent?
12 volts
Electrical resistance against the flow of current
Does not move
Relationship between current and potential difference

44. What type of circuit has one path of follow through a load?
DC current
Series circuit
Purging
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)

45. What is the relationship between magnetism and electricity?
Choke
Insulation resistance and Dielectric strength(Both A and B)
American wire gauge(AWG)
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)

46. What determines whether a spark can be produced?
Strength of the charge
Electromagnetism
Parallel
Stranded

47. What is a DC circuit characteristic?
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)
High resistance
Electromagnetic field

48. What is induction?
Current change in a coil creates a magnetic change
Fixed - Electrolytic - Variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Porcelain

49. The generator is what method of creating potential energy?
Electromagnetism
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Potential difference
Resistance increases as the conductor length increases

50. What is a type of mechanical transducer?
A magnetic field
Voltage
Solenoid and Relay(both A and B)
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)