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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. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Solenoid and Relay(both A and B)
10
Voltage

2. To what measurement do the conductor mills refer?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat and current control(both a and c)
1/1000th of an inch

3. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Bonding and grounding
10
Potential difference
20%

4. Which material has the lowest resistance at ordinary temperatures?
Fixed - Electrolytic - Variable(all of the above)
Silver
Plastic - Rubber - Friction(all of the above)
Grounding wire

5. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance
Area and spacing of capacitor - static current in the capacitor(both A and B)
The relationship of potential difference to current

6. What do we call the ability to do work?
Cells can be connected together to make a battery
Current flows in one direction - potential differences across a load does not change(Both A and B)
Energy
Wire splices

7. How is the heat production measured in a resistor?
Stranded
20%
Potential difference - E*I - current times current change from point to point(all of the above)
From the negative battery terminal to the positive terminal

8. What are the names of two of the six primary methods of producing a voltage?
Battery
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
First digit is 9
Cables

9. What does resistance produce?
Heat
First digit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stranded

10. What is the purpose of capacitors in electrical circuits?
Voltage
Potential difference - E*I - current times current change from point to point(all of the above)
Stores electrical charge
Composition of the resistor

11. What is the unit of measurement of electrical current?
DC current
Amperes
Tolerence
Use an effect to produce another effect

12. What does Ohm's Law represent?
Heat
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Unlike poles attract
Relationship between current and potential difference

13. What is true about a dry cell?
Opposes any change in the current flowing in a circuit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Insulation resistance
Common - not rechargable - gradually discharges when in storage(All of the above)

14. Identify the blueprint symbol for resistors.
--^V^V^V^---
Tolerence
Potential difference
A magnetic field

15. What is the purpose of a raceway?
Breakdown voltage
Amperes
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

16. What is the name for electrical resistance of insulation?
Insulation resistance
Magnetic properties
Current change in a coil creates a magnetic change
By their covering

17. What is a property of inductors in electrical circuits?
Bare - covered - insulated - stranded - cable(All of the above)
Breakdown voltage
Opposes any change in the current flowing in a circuit
First digit is 9

18. What do transducers do in electrical terms?
Wire splices
Use an effect to produce another effect
Start with the band on the end and read to the center
Current change in a coil creates a magnetic change

19. What is insulation resistance?
Potential difference
A magnetic field
Electrical resistance against the flow of current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

20. What is a common form used in conductors?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Cables
Unlike poles attract
Opposition to movement of free electrons

21. What does a third band of brown mean?
10
Silver
Cell
Relationship between current and potential difference

22. What does a first band of white mean?
Use an effect to produce another effect
DC flows continuously in one direction and AC potential difference and current both change direction
First digit is 9
Parallel circuit

23. What are the two generic methods to eliminate static electricity from metal objects?
Potential difference
Bonding and grounding
Common - not rechargable - gradually discharges when in storage(All of the above)
5%

24. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Electromagnetism
10
Voltage

25. The generator is what method of creating potential energy?
1/1000th of an inch
Two
Electromagnetism
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

26. What is the unit of measurement of potential difference?
The rate of doing work
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
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)
Volts

27. What does a transformer transform?
Volts
The relationship of potential difference to current
A magnetic field
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)

28. How is capacitance determined?
Common - not rechargable - gradually discharges when in storage(All of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Serial
12 volts

29. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Solenoid and Relay(both A and B)
50 Ohms
Start with the band on the end and read to the center

30. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Current change in a coil creates a magnetic change
5%
Purging
From the negative battery terminal to the positive terminal

31. What is resistance in electrical terms?
Potential difference - E*I - current times current change from point to point(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
15 -000 ohms - 20%
Opposition to electrical current

32. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Amperes
Parallel
1/1000th of an inch

33. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Stranded
Volts
12 volts

34. What is power?
Grounding wire
The rate of doing work
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts

35. Identify the general blueprint symbol for inductors.
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposition to electrical current
High resistance
Symbol

36. What is voltage?
Stores electrical charge
Alternating current
A difference in potential energy
Amperes

37. What is a characteristic of insulators?
Potential difference
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)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

38. What determines the resistance of a resistor?
Does not move
Stranded
Composition of the resistor
Tolerence

39. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Opposes any change in the current flowing in a circuit
Voltage
Start with the band on the end and read to the center
10%

40. What is a rigid metal conduit?
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)
Potential difference
Fixed - tapped - variable(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

41. What does a moving charge produce?
Opposes any change in the current flowing in a circuit
A magnetic field
Volts
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)

42. What do junction boxes protect?
Cells can be connected together to make a battery
Symbol
Wire splices
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

43. Which of the following materials is NOT a good conductor?
Gauge number
DC current
Potential difference
Porcelain

44. What information do the Left-Hand Rules provide?
10
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
75 Ohms

45. When reading resistance color codes - what does the fourth band indicate?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Ability to store an electric charge
Parallel
Tolerence

46. What makes electrons flow?
Breakdown voltage
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
75 Ohms
Potential difference

47. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Electromagnetic field
Chemical action
Series circuit

48. What is capacitance in electrical terms?
Ability to store an electric charge
Amperes
1/1000th of an inch
Cables

49. The dry cell is what method for creating potential energy?
Stores electrical charge
Chemical action
By their covering
Ability to store an electric charge

50. What can permanently break down a capacitor?
Breakdown voltage
DC flows continuously in one direction and AC potential difference and current both change direction
Resistance increases as the conductor length increases
Produce heat - light - or limit current to control it(all of the above)