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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 results when current is run through a material with high resistance?
Ability to store an electric charge
Heat and current control(both a and c)
Chemical action
Insulation resistance and Dielectric strength(Both A and B)

2. How is the heat production measured in a resistor?
Ability to store an electric charge
Parallel circuit
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)

3. Which material has the lowest resistance at ordinary temperatures?
15 -000 ohms - 20%
Fixed - tapped - variable(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Silver

4. What does static electricity do?
Cables
50 Ohms
Solenoid and Relay(both A and B)
Does not move

5. What does Ohm's Law represent?
Stranded
Relationship between current and potential difference
Ability to store an electric charge
Breakdown voltage

6. What is the difference between AC and DC?
Voltmeter
DC flows continuously in one direction and AC potential difference and current both change direction
15 -000 ohms - 20%
Plastic - Rubber - Friction(all of the above)

7. The thermocouple uses which method for creating potential energy?
Insulation resistance and Dielectric strength(Both A and B)
75 Ohms
Voltage
Heat

8. What does an object have if a magnetic field acts on it?
American wire gauge(AWG)
Solenoid and Relay(both A and B)
Potential difference
Magnetic properties

9. What is resistance in electrical terms?
A difference in potential energy
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to electrical current
Wire splices

10. What is resistance?
Opposition to movement of free electrons
Amperes
75 Ohms
How much potential difference can a material withstand before breaking down

11. What instrument measures voltage?
75 Ohms
Amperes
Composition of the resistor
Voltmeter

12. What are the common units of measurement for round and square conductor cross - sections?
20%
Circular and square mills(Both A and B)
15 -000 ohms - 20%
Secondary cell

13. Identify the blueprint symbol for resistors.
Opposition to movement of free electrons
Serial
First digit is 9
--^V^V^V^---

14. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Resistance increases as the conductor length increases
Area and spacing of capacitor - static current in the capacitor(both A and B)
Alternating current
12 volts

15. What is a DC circuit characteristic?
Unlike poles attract
American wire gauge(AWG)
Parallel
Current flows in one direction - potential differences across a load does not change(Both A and B)

16. What determines the resistance of a resistor?
Common - not rechargable - gradually discharges when in storage(All of the above)
Potential difference
Solenoid and Relay(both A and B)
Composition of the resistor

17. What does a first band of white mean?
First digit is 9
Relationship between current and potential difference
Bonding and grounding
12 volts

18. What is a characteristic of insulators?
The rate of doing work
Voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Solenoid and Relay(both A and B)

19. When does a DC circuit oppose current flow?
Cell
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)
Chemical action

20. What is the unit of measurement of electrical current?
Chemical action
Plastic - Rubber - Friction(all of the above)
Amperes
20%

21. What do electrical charges need to cause a fire or explosion?
The direction of the magnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
A difference in potential energy
Heat and current control(both a and c)

22. What is the relationship between magnetism and electricity?
Battery
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)
Secondary cell
Start with the band on the end and read to the center

23. What does a transformer transform?
The relationship of potential difference to current
1/1000th of an inch
Electromagnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

24. How do you read resistor color codes?
High resistance
Start with the band on the end and read to the center
Cables
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)

25. What is an electromagnet?
The direction of the magnetic field
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
American wire gauge(AWG)
Serial

26. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Electromagnetic field
Ohms
1 watt

27. What are the names of two of the six primary methods of producing a voltage?
12 volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Symbol
The rate of doing work

28. Identify the general blueprint symbol for inductors.
Two
Symbol
A difference in potential energy
--^V^V^V^---

29. The dry cell is what method for creating potential energy?
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)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Chemical action

30. What is the name for electrical resistance of insulation?
Insulation resistance
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electrical resistance against the flow of current

31. What types of protective tapes are used?
1 watt
Voltage
Plastic - Rubber - Friction(all of the above)
Electrical resistance against the flow of current

32. What is power?
Heat
Energy
Solenoid and Relay(both A and B)
The rate of doing work

33. What is the term for doing work at the rate of joule per second?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy
1 watt
Grounding wire

34. What are the two generic methods to eliminate static electricity from metal objects?
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)
Bonding and grounding
12 volts

35. What is the basic law of magnetic force?
Unlike poles attract
Mutual induction
Solenoid and Relay(both A and B)
Secondary cell

36. Why is the transformer important to AC electricity?

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37. What is voltage?
Energy
A difference in potential energy
Stranded
Composition of the resistor

38. What type of circuit has one path of follow through a load?
Tolerence
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Series circuit
Stores electrical charge

39. What is induction?
Current change in a coil creates a magnetic change
Circular and square mills(Both A and B)
Stranded
Battery

40. What is the fundamental property of insulators?
Common - not rechargable - gradually discharges when in storage(All of the above)
The rate of doing work
Insulation resistance and Dielectric strength(Both A and B)
Series circuit

41. How is capacitance determined?
Voltmeter
Area and spacing of capacitor - static current in the capacitor(both A and B)
Volts
1/1000th of an inch

42. What is a switch that operates by electricity?
Opposes any change in the current flowing in a circuit
Relay
A difference in potential energy
Serial

43. Where does the thumb point in both Left-Hand Rules?
By their covering
Stores electrical charge
The direction the negative charge moves
The relationship of potential difference to current

44. What is a common cause of static electricity in a shop?
Moving vehicles
Magnetic properties
Common - not rechargable - gradually discharges when in storage(All of the above)
Electromagnetic field

45. The generator is what method of creating potential energy?
Stores electrical charge
DC current
1 watt
Electromagnetism

46. What type of circuit has two or more paths for current to follow?
The direction of the magnetic field
Parallel circuit
Voltage
Electrical resistance against the flow of current

47. 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
Amperes
75 Ohms
20%
Opposes any change in the current flowing in a circuit

48. What is the term for two or more cells attached together?
Circular and square mills(Both A and B)
Potential difference
Battery
Voltage

49. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Magnetic properties
Heat
Cells can be connected together to make a battery

50. What wire measurement is commonly used in the U.S.?
Start with the band on the end and read to the center
Parallel circuit
Opposes any change in the current flowing in a circuit
American wire gauge(AWG)