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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. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
50 Ohms
Tolerence
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

2. What is another name for an inductor?
Choke
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

3. Why is the transformer important to AC electricity?

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4. What is a property of inductors in electrical circuits?
Relay
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Heat and current control(both a and c)
Opposes any change in the current flowing in a circuit

5. What is the purpose of resistors in electrical circuits?
1/1000th of an inch
Produce heat - light - or limit current to control it(all of the above)
Stranded
From the negative battery terminal to the positive terminal

6. Identify the blueprint symbol for capacitors.
Chemical action
Symbol
Volts
10

7. The dry cell is what method for creating potential energy?
Opposition to electrical current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
20%
Chemical action

8. What does a first band of white mean?
Moving vehicles
First digit is 9
Chemical action
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

9. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
The direction of the magnetic field
5%
Alternating current
Cables

10. What is an electromagnet?
Serial
Insulation resistance and Dielectric strength(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

11. When reading resistance color codes - what does the first band indicate?
Volts
DC flows continuously in one direction and AC potential difference and current both change direction
First digit
Composition of the resistor

12. What is the type of cable composed of many fine wires?
Insulation resistance and Dielectric strength(Both A and B)
A difference in potential energy
Stranded
12 volts

13. What does a moving charge produce?
A magnetic field
Potential difference
Plastic - Rubber - Friction(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)

14. What determines whether a spark can be produced?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
20%
Strength of the charge
Parallel circuit

15. What does a third band of brown mean?
By their covering
10
Bare - covered - insulated - stranded - cable(All of the above)
First digit is 9

16. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
DC flows continuously in one direction and AC potential difference and current both change direction
10%
Heat
5%

17. What are the common units of measurement for round and square conductor cross - sections?
5%
Circular and square mills(Both A and B)
20%
Grounding wire

18. What is a switch that operates by electricity?
Relay
Breakdown voltage
From the negative battery terminal to the positive terminal
Stores electrical charge

19. What does a transformer transform?
The relationship of potential difference to current
Amperes
Electrical resistance against the flow of current
Stranded

20. What is the name for electrical resistance of insulation?
Insulation resistance
Circular and square mills(Both A and B)
Mutual induction
First digit

21. What makes electrons flow?
Potential difference
5%
Chemical action
Solenoid and Relay(both A and B)

22. What information do the Left-Hand Rules provide?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
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)
Bare - covered - insulated - stranded - cable(All of the above)

23. What is the use of the electromagnet?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cables
Parallel circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

24. What is a type of mechanical transducer?
20%
Opposition to movement of free electrons
Common - not rechargable - gradually discharges when in storage(All of the above)
Solenoid and Relay(both A and B)

25. What makes electrons flow?
Resistance increases as the conductor length increases
Choke
Resistance value can not be changed
Potential difference

26. Identify the blueprint symbol for resistors.
First digit
Bare - covered - insulated - stranded - cable(All of the above)
Relay
--^V^V^V^---

27. What cannot be transformed to higher or lower potential differences?
Strength of the charge
DC current
Voltmeter
Insulation resistance and Dielectric strength(Both A and B)

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

29. The thermocouple uses which method for creating potential energy?
Unlike poles attract
Heat
Strength of the charge
Resistance value can not be changed

30. What is capacitance in electrical terms?
Series circuit
The relationship of potential difference to current
Ability to store an electric charge
10

31. A resistor is color coded brown - green - orange. What is its resistance?
Parallel circuit
Parallel
From the negative battery terminal to the positive terminal
15 -000 ohms - 20%

32. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
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)

33. What types of protective tapes are used?
Electrical resistance against the flow of current
Resistance value can not be changed
Plastic - Rubber - Friction(all of the above)
From the negative battery terminal to the positive terminal

34. What determines the resistance of a resistor?
Composition of the resistor
Circular and square mills(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

35. What do junction boxes protect?
Wire splices
First digit
Two
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

36. What wire measurement is commonly used in the U.S.?
10%
Electromagnetism
American wire gauge(AWG)
Area and spacing of capacitor - static current in the capacitor(both A and B)

37. How is capacitance determined?
Parallel
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Fixed - tapped - variable(all of the above)

38. To what measurement do the conductor mills refer?
12 volts
1/1000th of an inch
Opposition to electrical current
Cells can be connected together to make a battery

39. What is a conductor?
Produce heat - light - or limit current to control it(all of the above)
Moving vehicles
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

40. What do we call the ability to do work?
Battery
Energy
Mutual induction
The rate of doing work

41. What does resistance produce?
Heat
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Plastic - Rubber - Friction(all of the above)
Cells can be connected together to make a battery

42. Which of the following materials is NOT a good conductor?
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)
American wire gauge(AWG)
Cell
Porcelain

43. What is a common measure of wire diameter?
Gauge number
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Chemical action
10%

44. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Two
Stranded
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

45. What is a common form used in conductors?
Cables
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Electromagnetism
Ohms

46. What type of circuit has one path of follow through a load?
50 Ohms
Heat
Symbol
Series circuit

47. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Opposes any change in the current flowing in a circuit
Common - not rechargable - gradually discharges when in storage(All of the above)
15 -000 ohms - 20%

48. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A difference in potential energy
From the negative battery terminal to the positive terminal
20%

49. What is true about a dry cell?
20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)

50. What is the measure of potential difference?
Unlike poles attract
Volts
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Mutual induction