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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. What does static electricity do?
Battery
Does not move
Potential difference - E*I - current times current change from point to point(all of the above)
Heat and current control(both a and c)

2. What is the use of the electromagnet?
DC flows continuously in one direction and AC potential difference and current both change direction
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cables
Heat

3. Which way is the current going in the circuit shown?(electron flow)
Choke
From the negative battery terminal to the positive terminal
15 -000 ohms - 20%
Electromagnetic field

4. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Relay
Battery
Symbol

5. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Common - not rechargable - gradually discharges when in storage(All of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
10%
Stranded

6. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
DC flows continuously in one direction and AC potential difference and current both change direction
Grounding wire
Opposes any change in the current flowing in a circuit

7. What is the type of cable composed of many fine wires?
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)
By their covering
Stranded
Area and spacing of capacitor - static current in the capacitor(both A and B)

8. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Tolerence
Insulation resistance and Dielectric strength(Both A and B)
Plastic - Rubber - Friction(all of the above)

9. What must be large enough to carry the largest current likely to occur?
Cables
Grounding wire
Heat
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

10. What is a characteristic of a fixed resistor?
Resistance value can not be changed
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Ohms
Insulation resistance and Dielectric strength(Both A and B)

11. What is the unit of measurement of electrical current?
Chemical action
Voltmeter
Tolerence
Amperes

12. What is a way to classify wires and cables?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
By their covering
Parallel circuit
Start with the band on the end and read to the center

13. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
Ohms
Electromagnetism
Circular and square mills(Both A and B)

14. What is induction?
How much potential difference can a material withstand before breaking down
Current change in a coil creates a magnetic change
Resistance value can not be changed
Opposition to electrical current

15. What are the names of two of the six primary methods of producing a voltage?
Bonding and grounding
First digit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to electrical current

16. What is true about a dry cell?
75 Ohms
Energy
Common - not rechargable - gradually discharges when in storage(All of the above)
A magnetic field

17. What is an arrangement of materials that create a potential difference by chemistry?
5%
By their covering
Cell
--^V^V^V^---

18. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Electrical resistance against the flow of current
From the negative battery terminal to the positive terminal
Insulation resistance

19. What is a rigid metal conduit?
DC flows continuously in one direction and AC potential difference and current both change direction
Resistance increases as the conductor length increases
Serial
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

20. What is the term for doing work at the rate of joule per second?
Wire splices
1 watt
First digit is 9
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)

21. What cannot be transformed to higher or lower potential differences?
--^V^V^V^---
Secondary cell
Serial
DC current

22. What type of circuit has two or more paths for current to follow?
--^V^V^V^---
5%
Parallel circuit
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

23. Identify the general blueprint symbol for inductors.
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)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Symbol
Secondary cell

24. Which of the following materials is NOT a good conductor?
Silver
1 watt
Porcelain
Voltage

25. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
DC flows continuously in one direction and AC potential difference and current both change direction
Heat and current control(both a and c)
20%

26. What is a wire classification?
Silver
How much potential difference can a material withstand before breaking down
Bare - covered - insulated - stranded - cable(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)

27. What is a type of mechanical transducer?
Magnetic properties
Solenoid and Relay(both A and B)
Stranded
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

28. To what measurement do the conductor mills refer?
1/1000th of an inch
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cell
75 Ohms

29. What is the name for electrical resistance of insulation?
Volts
75 Ohms
Moving vehicles
Insulation resistance

30. What determines the resistance of a resistor?
Composition of the resistor
First digit is 9
Insulation resistance and Dielectric strength(Both A and B)
The direction the negative charge moves

31. What is the relationship between magnetism and electricity?
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)
Symbol
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)

32. What is a common cause of static electricity in a shop?
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
Current change in a coil creates a magnetic change
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

33. What is a DC circuit characteristic?
Parallel
Current flows in one direction - potential differences across a load does not change(Both A and B)
Current change in a coil creates a magnetic change
Potential difference

34. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Stranded
Amperes
Ability to store an electric charge

35. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating 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)
Relationship between current and potential difference
Electrical resistance against the flow of current

36. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposition to electrical current
DC current
Plastic - Rubber - Friction(all of the above)

37. What is voltage?
A difference in potential energy
10%
Insulation resistance
Parallel circuit

38. The generator is what method of creating potential energy?
Parallel circuit
Resistance increases as the conductor length increases
Tolerence
Electromagnetism

39. What is needed for electric heating elements and the filaments of light bulbs?
The direction the negative charge moves
High resistance
Voltage
Symbol

40. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Cables
Purging
Energy
Amperes

41. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Common - not rechargable - gradually discharges when in storage(All of the above)
American wire gauge(AWG)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
5%

42. What is the purpose of a raceway?
American wire gauge(AWG)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

43. How is the heat production measured in a resistor?
A magnetic field
Heat
Breakdown voltage
Potential difference - E*I - current times current change from point to point(all of the above)

44. What is the difference between AC and DC?
Start with the band on the end and read to the center
5%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
DC flows continuously in one direction and AC potential difference and current both change direction

45. What instrument measures voltage?
Voltmeter
Volts
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Symbol

46. What does a transformer transform?
The relationship of potential difference to current
Ability to store an electric charge
Heat
First digit is 9

47. What makes electrons flow?
Potential difference
Alternating current
Secondary cell
High resistance

48. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Relationship between current and potential difference
Solenoid and Relay(both A and B)
A difference in potential energy

49. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
1/1000th of an inch
Voltmeter

50. 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)
Resistance value can not be changed
Grounding wire
Composition of the resistor