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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.
Stores electrical charge
Start with the band on the end and read to the center
50 Ohms
10%

2. What is the purpose of resistors in electrical circuits?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Produce heat - light - or limit current to control it(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

3. What does Ohm's Law represent?
Produce heat - light - or limit current to control it(all of the above)
Relationship between current and potential difference
12 volts
50 Ohms

4. Which material has the lowest resistance at ordinary temperatures?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Silver
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
American wire gauge(AWG)

5. 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
Gauge number
Moving vehicles
Stores electrical charge
75 Ohms

6. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Parallel
Serial
Current change in a coil creates a magnetic change
Bare - covered - insulated - stranded - cable(All of the above)

7. What does a moving charge produce?
Bare - covered - insulated - stranded - cable(All of the above)
How much potential difference can a material withstand before breaking down
A magnetic field
Symbol

8. What does static electricity do?
Does not move
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Battery

9. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Alternating current
Composition of the resistor
Mutual induction

10. What are the two generic methods to eliminate static electricity from metal objects?
Opposition to electrical current
Bonding and grounding
Opposes any change in the current flowing in a circuit
Electrical resistance against the flow of current

11. Identify the blueprint symbol for resistors.
Wire splices
Gauge number
Mutual induction
--^V^V^V^---

12. What is an arrangement of materials that create a potential difference by chemistry?
Cell
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol
10

13. What is dielectric strength?
Resistance increases as the conductor length increases
15 -000 ohms - 20%
How much potential difference can a material withstand before breaking down
Potential difference - E*I - current times current change from point to point(all of the above)

14. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
5%
Resistance value can not be changed
First digit is 9
Mutual induction

15. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Volts
Alternating current
Breakdown voltage

16. The generator is what method of creating potential energy?
Does not move
American wire gauge(AWG)
Moving vehicles
Electromagnetism

17. What makes electrons flow?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
75 Ohms
Potential difference
Fixed - Electrolytic - Variable(all of the above)

18. What is a common cause of static electricity in a shop?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Parallel
1/1000th of an inch
Moving vehicles

19. What do electrical charges need to cause a fire or explosion?
Two
First digit
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cables

20. What is voltage?
Symbol
Series circuit
75 Ohms
A difference in potential energy

21. What do transducers do in electrical terms?
Use an effect to produce another effect
Secondary cell
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposition to electrical current

22. The thermocouple uses which method for creating potential energy?
Heat
Stores electrical charge
Porcelain
High resistance

23. What type of circuit has two or more paths for current to follow?
Insulation resistance
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Parallel circuit
The direction the negative charge moves

24. What does a transformer transform?
First digit
Battery
The relationship of potential difference to current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

25. Identify the blueprint symbol for capacitors.
Relay
Symbol
Parallel circuit
Composition of the resistor

26. What is the relationship between magnetism and electricity?
Stores electrical charge
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)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
From the negative battery terminal to the positive terminal

27. What can permanently break down a capacitor?
Chemical action
50 Ohms
Breakdown voltage
1/1000th of an inch

28. The dry cell is what method for creating potential energy?
Energy
Chemical action
1/1000th of an inch
Cell

29. What does resistance produce?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Ohms
Heat
Moving vehicles

30. What is the fundamental property of insulators?
Voltage
Electrical resistance against the flow of current
The direction the negative charge moves
Insulation resistance and Dielectric strength(Both A and B)

31. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Purging
Breakdown voltage
First digit

32. What makes electrons flow?
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
Parallel circuit
Secondary cell

33. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Opposition to movement of free electrons
75 Ohms
5%
Electrical resistance against the flow of current

34. What wire measurement is commonly used in the U.S.?
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)
American wire gauge(AWG)
Current change in a coil creates a magnetic change
Cables

35. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
First digit
Voltage
Cables
Parallel

36. What does a first band of white mean?
Ability to store an electric charge
Gauge number
Secondary cell
First digit is 9

37. What is a rigid metal conduit?
Porcelain
Use an effect to produce another effect
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Stranded

38. What are the common units of measurement for round and square conductor cross - sections?
A difference in potential energy
Opposition to electrical current
1/1000th of an inch
Circular and square mills(Both A and B)

39. What is induction?
20%
Serial
DC current
Current change in a coil creates a magnetic change

40. To what measurement do the conductor mills refer?
Solenoid and Relay(both A and B)
1/1000th of an inch
The rate of doing work
Relay

41. What is the unit of measurement of resistance?
Ohms
Mutual induction
Plastic - Rubber - Friction(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

42. Which of the following is a type of resistor?
Fixed - tapped - variable(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)
Composition of the resistor
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

43. What do we call the ability to do work?
The rate of doing work
From the negative battery terminal to the positive terminal
Energy
Wire splices

44. Which type of cell can be recharged?
10%
Secondary cell
DC current
A magnetic field

45. What is the purpose of capacitors in electrical circuits?
A difference in potential energy
Mutual induction
Amperes
Stores electrical charge

46. What type of circuit has one path of follow through a load?
Series circuit
Gauge number
Insulation resistance
1 watt

47. Identify the general blueprint symbol for inductors.
Symbol
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)
Resistance value can not be changed
Potential difference

48. What is true about a dry cell?
Opposes any change in the current flowing in a circuit
Volts
Common - not rechargable - gradually discharges when in storage(All of the above)
1 watt

49. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
10
The relationship of potential difference to current
Purging
Opposition to movement of free electrons

50. When reading resistance color codes - what does the fourth band indicate?
Symbol
Insulation resistance
Tolerence
Symbol