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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 is the unit of measurement of resistance?
Ohms
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Use an effect to produce another effect
Mutual induction

2. How is capacitance determined?
Circular and square mills(Both A and B)
Amperes
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)

3. What is the purpose of resistors in electrical circuits?
Current flows in one direction - potential differences across a load does not change(Both A and B)
From the negative battery terminal to the positive terminal
Produce heat - light - or limit current to control it(all of the above)
First digit is 9

4. What is a characteristic of a fixed resistor?
Resistance value can not be changed
A difference in potential energy
High resistance
Ohms

5. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Electromagnetic field
Magnetic properties

6. What is the relationship between magnetism and electricity?
From the negative battery terminal to the positive terminal
Parallel circuit
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)

7. What results when current is run through a material with high resistance?
10%
Voltmeter
Heat and current control(both a and c)
10

8. What type of circuit has two or more paths for current to follow?
Solenoid and Relay(both A and B)
Produce heat - light - or limit current to control it(all of the above)
Parallel circuit
First digit is 9

9. What can permanently break down a capacitor?
50 Ohms
Composition of the resistor
Breakdown voltage
Heat

10. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
75 Ohms
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
5%

11. Where do the fingers point in both Left-Hand Rules?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
From the negative battery terminal to the positive terminal
High resistance
The direction of the magnetic field

12. A resistor is color coded brown - green - orange. What is its resistance?
Insulation resistance
15 -000 ohms - 20%
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)
Serial

13. What is induction?
Current change in a coil creates a magnetic change
Silver
Battery
Potential difference

14. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Alternating current
Insulation resistance and Dielectric strength(Both A and B)
Bonding and grounding

15. When does a DC circuit oppose current flow?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Electromagnetic field
Ability to store an electric charge

16. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
First digit
Parallel
50 Ohms
Alternating current

17. What type of circuit has one path of follow through a load?
Unlike poles attract
Series circuit
From the negative battery terminal to the positive terminal
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

18. What determines the resistance of a resistor?
Parallel circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Composition of the resistor
How much potential difference can a material withstand before breaking down

19. What is the basic law of magnetic force?
American wire gauge(AWG)
DC flows continuously in one direction and AC potential difference and current both change direction
Cell
Unlike poles attract

20. Which material has the lowest resistance at ordinary temperatures?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat
Silver
Battery

21. What is a DC circuit characteristic?
DC flows continuously in one direction and AC potential difference and current both change direction
20%
Current flows in one direction - potential differences across a load does not change(Both A and B)
Circular and square mills(Both A and B)

22. What is the term for two or more cells attached together?
Battery
12 volts
Produce heat - light - or limit current to control it(all of the above)
Gauge number

23. The generator is what method of creating potential energy?
The direction the negative charge moves
20%
Electromagnetism
Cells can be connected together to make a battery

24. What are the common units of measurement for round and square conductor cross - sections?
Does not move
Circular and square mills(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
Strength of the charge

25. How do static charges distribute themselves?
Secondary cell
Series circuit
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Common - not rechargable - gradually discharges when in storage(All of the above)

26. The dry cell is what method for creating potential energy?
Cells can be connected together to make a battery
First digit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Chemical action

27. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(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)
75 Ohms

28. Identify the blueprint symbol for capacitors.
Magnetic properties
Symbol
DC current
Fixed - tapped - variable(all of the above)

29. How many kinds of poles do magnets have?
Two
Potential difference - E*I - current times current change from point to point(all of the above)
10%
Porcelain

30. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Opposition to electrical current
10%
Tolerence

31. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Bonding and grounding

32. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Gauge number
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Resistance increases as the conductor length increases

33. What is the name for electrical resistance of insulation?
Choke
First digit
Bonding and grounding
Insulation resistance

34. What does static electricity do?
Does not move
Purging
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The direction of the magnetic field

35. What wire measurement is commonly used in the U.S.?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
The rate of doing work
American wire gauge(AWG)

36. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Produce heat - light - or limit current to control it(all of the above)
First digit is 9
Voltage
Stores electrical charge

37. When reading resistance color codes - what does the fourth band indicate?
Resistance value can not be changed
Tolerence
Volts
Cells can be connected together to make a battery

38. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Relay
Relationship between current and potential difference
By their covering
Serial

39. Which of the following materials is NOT a good conductor?
Alternating current
Symbol
Porcelain
Potential difference

40. What is true about a dry cell?
Grounding wire
Common - not rechargable - gradually discharges when in storage(All of the above)
Serial
How much potential difference can a material withstand before breaking down

41. What makes electrons flow?
Composition of the resistor
Potential difference
Resistance value can not be changed
From the negative battery terminal to the positive terminal

42. What is an arrangement of materials that create a potential difference by chemistry?
First digit
Cell
Common - not rechargable - gradually discharges when in storage(All of the above)
Serial

43. What is a wire classification?
Bonding and grounding
American wire gauge(AWG)
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)
Bare - covered - insulated - stranded - cable(All of the above)

44. What information do the Left-Hand Rules provide?
Fixed - Electrolytic - Variable(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Secondary cell

45. What are the names of two of the six primary methods of producing a voltage?
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)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Cell

46. What is the difference between AC and DC?
Chemical action
DC flows continuously in one direction and AC potential difference and current both change direction
50 Ohms
Silver

47. Identify the blueprint symbol for resistors.
First digit
--^V^V^V^---
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
12 volts

48. To what measurement do the conductor mills refer?
Heat and current control(both a and c)
Stores electrical charge
Purging
1/1000th of an inch

49. What is insulation resistance?
How much potential difference can a material withstand before breaking down
Mutual induction
Chemical action
Electrical resistance against the flow of current

50. What is dielectric strength?
Heat and current control(both a and c)
Potential difference - E*I - current times current change from point to point(all of the above)
Plastic - Rubber - Friction(all of the above)
How much potential difference can a material withstand before breaking down