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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. The thermocouple uses which method for creating potential energy?
Amperes
Cell
Symbol
Heat

2. What is a rigid metal conduit?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts
--^V^V^V^---
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

3. What does Ohm's Law represent?
Opposition to electrical current
Heat and current control(both a and c)
15 -000 ohms - 20%
Relationship between current and potential difference

4. The dry cell is what method for creating potential energy?
Chemical action
Stores electrical charge
Potential difference
50 Ohms

5. What is capacitance in electrical terms?
Ability to store an electric charge
By their covering
The direction of the magnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

6. What can permanently break down a capacitor?
50 Ohms
Breakdown voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
DC current

7. What is resistance?
Opposition to movement of free electrons
Voltage
Electromagnetism
Tolerence

8. What is an arrangement of materials that create a potential difference by chemistry?
By their covering
Series circuit
Cell
Volts

9. What is a common cause of static electricity in a shop?
Ohms
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
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)
Moving vehicles

10. Identify the blueprint symbol for capacitors.
Symbol
How much potential difference can a material withstand before breaking down
1 watt
Potential difference

11. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Voltmeter
Silver
Fixed - tapped - variable(all of the above)

12. Where do the fingers point in both Left-Hand Rules?
50 Ohms
Resistance increases as the conductor length increases
The direction of the magnetic field
12 volts

13. What do we call the ability to do work?
Common - not rechargable - gradually discharges when in storage(All of the above)
Two
Solenoid and Relay(both A and B)
Energy

14. What is another name for an inductor?
Ability to store an electric charge
Choke
10
Voltage

15. Why is the transformer important to AC electricity?

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16. What is a wire classification?
Insulation resistance and Dielectric strength(Both A and B)
Serial
Bare - covered - insulated - stranded - cable(All of the above)
Volts

17. Identify the general blueprint symbol for inductors.
Start with the band on the end and read to the center
Symbol
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

18. What is a property of inductors in electrical circuits?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The direction the negative charge moves
Chemical action
Opposes any change in the current flowing in a circuit

19. What is induction?
Alternating current
Volts
Volts
Current change in a coil creates a magnetic change

20. What is the purpose of a raceway?
10
Choke
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Heat

21. What do electrical charges need to cause a fire or explosion?
1 watt
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
5%
10

22. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Heat
Alternating current
Secondary cell
5%

23. 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
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)
75 Ohms
First digit is 9

24. What is a way to classify wires and cables?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Potential difference - E*I - current times current change from point to point(all of the above)
By their covering
Electromagnetism

25. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltmeter
Voltage
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Tolerence

26. What type of circuit has two or more paths for current to follow?
Wire splices
Parallel circuit
Use an effect to produce another effect
DC flows continuously in one direction and AC potential difference and current both change direction

27. What cannot be transformed to higher or lower potential differences?
Insulation resistance
Choke
Volts
DC current

28. What does a first band of white mean?
First digit is 9
Porcelain
Stranded
Parallel circuit

29. What does static electricity do?
Heat
Potential difference - E*I - current times current change from point to point(all of the above)
Does not move
Bonding and grounding

30. What types of protective tapes are used?
Produce heat - light - or limit current to control it(all of the above)
Plastic - Rubber - Friction(all of the above)
5%
Secondary cell

31. What is the difference between AC and DC?
By their covering
DC flows continuously in one direction and AC potential difference and current both change direction
First digit
The rate of doing work

32. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Stores electrical charge
20%
Produce heat - light - or limit current to control it(all of the above)
Stranded

33. When does a DC circuit oppose current flow?
Magnetic properties
Resistance value can not be changed
Fixed - Electrolytic - Variable(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

34. Which of the following materials is NOT a good conductor?
Stranded
Porcelain
Circular and square mills(Both A and B)
A difference in potential energy

35. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Chemical action
10%
5%

36. What is the basic law of magnetic force?
Silver
Unlike poles attract
Parallel
1/1000th of an inch

37. What is the unit of measurement of electrical current?
Current change in a coil creates a magnetic change
Cables
Amperes
Silver

38. What does a third band of brown mean?
75 Ohms
Symbol
10
Fixed - Electrolytic - Variable(all of the above)

39. What is the relationship of conductor size and length to resistance?
First digit is 9
15 -000 ohms - 20%
Resistance increases as the conductor length increases
Battery

40. What is the purpose of capacitors in electrical circuits?
Magnetic properties
Voltage
Breakdown voltage
Stores electrical charge

41. What type of circuit has one path of follow through a load?
Series circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke
First digit

42. What makes electrons flow?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
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)
Electromagnetic field
Potential difference

43. What are the two generic methods to eliminate static electricity from metal objects?
Cells can be connected together to make a battery
Opposes any change in the current flowing in a circuit
20%
Bonding and grounding

44. What is a DC circuit characteristic?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Ability to store an electric charge
Current flows in one direction - potential differences across a load does not change(Both A and B)
Mutual induction

45. What is a switch that operates by electricity?
Relay
From the negative battery terminal to the positive terminal
Chemical action
Heat

46. How is the heat production measured in a resistor?
The direction the negative charge moves
Resistance value can not be changed
20%
Potential difference - E*I - current times current change from point to point(all of the above)

47. How is capacitance determined?
Heat and current control(both a and c)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The rate of doing work

48. What is needed for electric heating elements and the filaments of light bulbs?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
High resistance
DC flows continuously in one direction and AC potential difference and current both change direction
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

49. What is a type of mechanical transducer?
Relationship between current and potential difference
10%
Solenoid and Relay(both A and B)
Series circuit

50. What is the use of the electromagnet?
Use an effect to produce another effect
Secondary cell
Parallel
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)