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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 difference between AC and DC?
Mutual induction
DC flows continuously in one direction and AC potential difference and current both change direction
Cells can be connected together to make a battery
Chemical action

2. Where does the thumb point in both Left-Hand Rules?
5%
Electromagnetic field
Parallel circuit
The direction the negative charge moves

3. What are the common units of measurement for round and square conductor cross - sections?
DC current
Alternating current
High resistance
Circular and square mills(Both A and B)

4. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - tapped - variable(all of the above)

5. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Electromagnetic field
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A magnetic field

6. The generator is what method of creating potential energy?
Stranded
The direction the negative charge moves
Magnetic properties
Electromagnetism

7. What do junction boxes protect?
Symbol
Breakdown voltage
Wire splices
Grounding wire

8. What determines whether a spark can be produced?
Strength of the charge
Voltmeter
Heat and current control(both a and c)
Potential difference

9. What is an electromagnet?
Heat
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Current flows in one direction - potential differences across a load does not change(Both A and B)
Cables

10. What are the two generic methods to eliminate static electricity from metal objects?
Amperes
Wire splices
Bonding and grounding
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

11. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Choke
15 -000 ohms - 20%
Voltage
Fixed - Electrolytic - Variable(all of the above)

12. What does a moving charge produce?
First digit
Start with the band on the end and read to the center
Relationship between current and potential difference
A magnetic field

13. What is the basic law of magnetic force?
Energy
The direction of the magnetic field
Unlike poles attract
Start with the band on the end and read to the center

14. Identify the general blueprint symbol for inductors.
From the negative battery terminal to the positive terminal
Symbol
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Volts

15. What instrument measures voltage?
Opposition to movement of free electrons
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Voltmeter
Bonding and grounding

16. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
First digit is 9
Volts
Heat and current control(both a and c)

17. The dry cell is what method for creating potential energy?
Relationship between current and potential difference
1/1000th of an inch
Relay
Chemical action

18. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Use an effect to produce another effect
Bonding and grounding

19. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Purging
Mutual induction
Secondary cell

20. How do static charges distribute themselves?
10%
The direction of the magnetic field
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Heat and current control(both a and c)

21. In most applications - what remains constant if the current remains constant and flows in one direction?
First digit
Heat
Electromagnetic field
Amperes

22. What can permanently break down a capacitor?
Insulation resistance
Resistance increases as the conductor length increases
Alternating current
Breakdown voltage

23. What is induction?
Alternating current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Voltmeter
Current change in a coil creates a magnetic change

24. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
75 Ohms
Secondary cell
Unlike poles attract

25. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Circular and square mills(Both A and B)
Porcelain
Serial
Current flows in one direction - potential differences across a load does not change(Both A and B)

26. What determines the resistance of a resistor?
Silver
Composition of the resistor
Choke
Series circuit

27. What is voltage?
Current flows in one direction - potential differences across a load does not change(Both A and B)
A difference in potential energy
Breakdown voltage
Porcelain

28. Which material has the lowest resistance at ordinary temperatures?
10
The relationship of potential difference to current
Chemical action
Silver

29. What does a first band of white mean?
First digit is 9
Breakdown voltage
Bonding and grounding
The rate of doing work

30. To what measurement do the conductor mills refer?
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)
Strength of the charge
1/1000th of an inch
Insulation resistance and Dielectric strength(Both A and B)

31. What is the relationship of conductor size and length to resistance?
Cells can be connected together to make a battery
--^V^V^V^---
Relationship between current and potential difference
Resistance increases as the conductor length increases

32. What type of circuit has two or more paths for current to follow?
Parallel circuit
Volts
Composition of the resistor
Produce heat - light - or limit current to control it(all of the above)

33. When reading resistance color codes - what does the first band indicate?
Bare - covered - insulated - stranded - cable(All of the above)
10
First digit
Parallel

34. How many kinds of poles do magnets have?
Resistance value can not be changed
Two
The direction the negative charge moves
5%

35. What is a type of capacitor?
Heat and current control(both a and c)
Opposition to movement of free electrons
Fixed - Electrolytic - Variable(all of the above)
The direction the negative charge moves

36. What is resistance?
Secondary cell
Opposition to movement of free electrons
Two
Volts

37. What information do the Left-Hand Rules provide?
Two
Silver
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Mutual induction

38. What is the relationship between magnetism and electricity?
Cell
Breakdown voltage
Silver
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)

39. What is the purpose of resistors in electrical circuits?
Cells can be connected together to make a battery
Unlike poles attract
Ohms
Produce heat - light - or limit current to control it(all of the above)

40. How do you read resistor color codes?
DC current
The direction the negative charge moves
Start with the band on the end and read to the center
Insulation resistance and Dielectric strength(Both A and B)

41. What is the fundamental property of insulators?
Heat and current control(both a and c)
Magnetic properties
--^V^V^V^---
Insulation resistance and Dielectric strength(Both A and B)

42. What is the unit of measurement of resistance?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Cells can be connected together to make a battery
Ohms
First digit

43. What is a property of inductors in electrical circuits?
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)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
20%
Opposes any change in the current flowing in a circuit

44. What results when current is run through a material with high resistance?
The direction of the magnetic field
Battery
Heat and current control(both a and c)
Cables

45. What is the unit of measurement of electrical current?
Amperes
--^V^V^V^---
12 volts
Volts

46. What do electrical charges need to cause a fire or explosion?
Wire splices
Symbol
The rate of doing work
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

47. Identify the blueprint symbol for capacitors.
Symbol
Heat and current control(both a and c)
Circular and square mills(Both A and B)
The relationship of potential difference to current

48. What does a transformer transform?
The relationship of potential difference to current
American wire gauge(AWG)
Bare - covered - insulated - stranded - cable(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)

49. What does resistance produce?
Serial
Solenoid and Relay(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction
Heat

50. Which type of cell can be recharged?
Secondary cell
1/1000th of an inch
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)