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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 cannot be transformed to higher or lower potential differences?
10%
Ohms
Heat and current control(both a and c)
DC current

2. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Series circuit
Parallel
Ability to store an electric charge

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

4. When reading resistance color codes - what does the fourth band indicate?
Relationship between current and potential difference
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Tolerence
Electromagnetic field

5. What makes electrons flow?
Area and spacing of capacitor - static current in the capacitor(both A and B)
12 volts
Potential difference
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

6. The thermocouple uses which method for creating potential energy?
Heat
Silver
First digit
The direction the negative charge moves

7. What is a switch that operates by electricity?
Plastic - Rubber - Friction(all of the above)
Relay
Opposition to movement of free electrons
Fixed - tapped - variable(all of the above)

8. A resistor is color coded brown - green - orange. What is its resistance?
Produce heat - light - or limit current to control it(all of the above)
Voltmeter
15 -000 ohms - 20%
Electrical resistance against the flow of current

9. What is a way to classify wires and cables?
By their covering
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)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Fixed - Electrolytic - Variable(all of the above)

10. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Opposition to movement of free electrons
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Tolerence

11. What results when current is run through a material with high resistance?
Chemical action
Heat and current control(both a and c)
Grounding wire
Relay

12. What is capacitance in electrical terms?
Ability to store an electric charge
Plastic - Rubber - Friction(all of the above)
Moving vehicles
Bonding and grounding

13. What is the difference between AC and DC?
American wire gauge(AWG)
DC flows continuously in one direction and AC potential difference and current both change direction
Insulation resistance
Electrical resistance against the flow of current

14. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Battery
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)
20%
DC current

15. The generator is what method of creating potential energy?
Unlike poles attract
50 Ohms
Electromagnetism
--^V^V^V^---

16. What is needed for electric heating elements and the filaments of light bulbs?
Electromagnetic field
High resistance
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat and current control(both a and c)

17. What do transducers do in electrical terms?
Insulation resistance and Dielectric strength(Both A and B)
Does not move
Use an effect to produce another effect
Stores electrical charge

18. Which way is the current going in the circuit shown?(electron flow)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
From the negative battery terminal to the positive terminal
Area and spacing of capacitor - static current in the capacitor(both A and B)
Strength of the charge

19. What does a third band of brown mean?
Voltmeter
DC flows continuously in one direction and AC potential difference and current both change direction
10
Amperes

20. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Two
Mutual induction
Resistance value can not be changed
Voltage

21. What is a common form used in conductors?
Use an effect to produce another effect
75 Ohms
Cables
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

22. What is an arrangement of materials that create a potential difference by chemistry?
Cell
Potential difference
Parallel circuit
Silver

23. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
20%
Circular and square mills(Both A and B)
Does not move

24. Identify the general blueprint symbol for inductors.
--^V^V^V^---
Symbol
Cells can be connected together to make a battery
From the negative battery terminal to the positive terminal

25. What is dielectric strength?
High resistance
How much potential difference can a material withstand before breaking down
Porcelain
50 Ohms

26. What does an object have if a magnetic field acts on it?
Opposes any change in the current flowing in a circuit
Area and spacing of capacitor - static current in the capacitor(both A and B)
Magnetic properties
Stores electrical charge

27. What is the term for doing work at the rate of joule per second?
Series circuit
Bare - covered - insulated - stranded - cable(All of the above)
1 watt
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)

28. What is voltage?
Battery
Two
A difference in potential energy
Heat

29. What is the relationship between magnetism and electricity?
10
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)
Cables
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

30. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Use an effect to produce another effect
15 -000 ohms - 20%
Opposition to electrical current

31. Which type of cell can be recharged?
Secondary cell
Symbol
Potential difference
Insulation resistance and Dielectric strength(Both A and B)

32. What determines whether a spark can be produced?
Secondary cell
Strength of the charge
Alternating current
Unlike poles attract

33. What information do the Left-Hand Rules provide?
Purging
Insulation resistance
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
The direction of the magnetic field

34. What is the purpose of resistors in electrical circuits?
Plastic - Rubber - Friction(all of the above)
50 Ohms
High resistance
Produce heat - light - or limit current to control it(all of the above)

35. 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
20%
Cables
Electrical resistance against the flow of current
75 Ohms

36. What type of circuit has one path of follow through a load?
Energy
Series circuit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Fixed - Electrolytic - Variable(all of the above)

37. What instrument measures voltage?
Voltmeter
10
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts

38. What is the basic law of magnetic force?
A magnetic field
Unlike poles attract
By their covering
Cell

39. What is the type of cable composed of many fine wires?
Electromagnetic field
First digit
Stranded
Parallel circuit

40. What does a transformer transform?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Electrical resistance against the flow of current
The relationship of potential difference to current
15 -000 ohms - 20%

41. What is a rigid metal conduit?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to electrical current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Fixed - tapped - variable(all of the above)

42. What do electrical charges need to cause a fire or explosion?
Start with the band on the end and read to the center
Stores electrical charge
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Use an effect to produce another effect

43. What is the purpose of capacitors in electrical circuits?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Grounding wire
Series circuit
Stores electrical charge

44. What is a characteristic of insulators?
Volts
Circular and square mills(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
From the negative battery terminal to the positive terminal

45. What is true about a dry cell?
Resistance increases as the conductor length increases
Common - not rechargable - gradually discharges when in storage(All of the above)
Cells can be connected together to make a battery
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

46. Where does the thumb point in both Left-Hand Rules?
10%
Porcelain
Potential difference
The direction the negative charge moves

47. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
5%
How much potential difference can a material withstand before breaking down
Voltage

48. What does Ohm's Law represent?
Electromagnetic field
Relationship between current and potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Series circuit

49. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Electromagnetism
Parallel
Two
Purging

50. What does a first band of white mean?
Bonding and grounding
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Serial
First digit is 9