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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. How do you read resistor color codes?
Wire splices
Start with the band on the end and read to the center
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction

2. When reading resistance color codes - what does the first band indicate?
Ohms
Stores electrical charge
First digit
Cell

3. What is a rigid metal conduit?
Relationship between current and potential difference
Chemical action
By their covering
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

4. Where does the thumb point in both Left-Hand Rules?
Mutual induction
Symbol
The direction the negative charge moves
Cables

5. What is the purpose of capacitors in electrical circuits?
Circular and square mills(Both A and B)
Potential difference
Stores electrical charge
The rate of doing work

6. What cannot be transformed to higher or lower potential differences?
Secondary cell
American wire gauge(AWG)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
DC current

7. What is induction?
Heat and current control(both a and c)
Current change in a coil creates a magnetic change
Ohms
From the negative battery terminal to the positive terminal

8. What must be large enough to carry the largest current likely to occur?
Grounding wire
Magnetic properties
Heat
Potential difference

9. Given E=I X R and the following information - plug in the data and solve the problem for voltage. 0.015 ohms - 800 amps of current
Heat
12 volts
20%
Bonding and grounding

10. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Purging
Voltage
Alternating current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

11. What is the purpose of resistors in electrical circuits?
Electrical resistance against the flow of current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Produce heat - light - or limit current to control it(all of the above)
Ability to store an electric charge

12. What is the use of the electromagnet?
The rate of doing work
1/1000th of an inch
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Grounding wire

13. The dry cell is what method for creating potential energy?
Chemical action
Opposition to electrical current
A magnetic field
Current flows in one direction - potential differences across a load does not change(Both A and B)

14. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Moving vehicles
Alternating current
Breakdown voltage
Insulation resistance and Dielectric strength(Both A and B)

15. What is the unit of measurement of electrical current?
First digit is 9
Chemical action
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Amperes

16. What do transducers do in electrical terms?
The relationship of potential difference to current
Grounding wire
Serial
Use an effect to produce another effect

17. What does Ohm's Law represent?
Insulation resistance
Relationship between current and potential difference
Electromagnetic field
Insulation resistance and Dielectric strength(Both A and B)

18. What type of circuit has one path of follow through a load?
Gauge number
Series circuit
Serial
First digit

19. What is the fundamental property of insulators?
--^V^V^V^---
Strength of the charge
First digit
Insulation resistance and Dielectric strength(Both A and B)

20. What is capacitance in electrical terms?
Cell
Tolerence
Ability to store an electric charge
How much potential difference can a material withstand before breaking down

21. What information do the Left-Hand Rules provide?
Strength of the charge
Energy
A difference in potential energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

22. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Fixed - tapped - variable(all of the above)
Tolerence
Stores electrical charge

23. What is insulation resistance?
20%
Electrical resistance against the flow of current
Resistance increases as the conductor length increases
Parallel circuit

24. What is the unit of measurement of potential difference?
Voltage
Alternating current
Volts
Voltmeter

25. To what measurement do the conductor mills refer?
1/1000th of an inch
Energy
Gauge number
The relationship of potential difference to current

26. Which way is the current going in the circuit shown?(electron flow)
Voltmeter
DC flows continuously in one direction and AC potential difference and current both change direction
From the negative battery terminal to the positive terminal
Choke

27. Identify the general blueprint symbol for inductors.
Common - not rechargable - gradually discharges when in storage(All of the above)
Fixed - tapped - variable(all of the above)
Start with the band on the end and read to the center
Symbol

28. What wire measurement is commonly used in the U.S.?
Voltmeter
American wire gauge(AWG)
Parallel circuit
5%

29. What does a first band of white mean?
15 -000 ohms - 20%
First digit is 9
75 Ohms
50 Ohms

30. What do electrical charges need to cause a fire or explosion?
Opposes any change in the current flowing in a circuit
Magnetic properties
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

31. What does a third band of brown mean?
Alternating current
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol
10

32. What is a conductor?
A magnetic field
Grounding wire
Stranded
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

33. How do static charges distribute themselves?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Symbol
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference

34. What is resistance?
The rate of doing work
Insulation resistance
The direction the negative charge moves
Opposition to movement of free electrons

35. What do we call the ability to do work?
Choke
Energy
Ohms
Relationship between current and potential difference

36. What is the term for two or more cells attached together?
Battery
1/1000th of an inch
Two
Secondary cell

37. What is a switch that operates by electricity?
Amperes
Opposition to movement of free electrons
Relay
Relationship between current and potential difference

38. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Area and spacing of capacitor - static current in the capacitor(both A and B)
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)
Start with the band on the end and read to the center

39. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Heat
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

40. Identify the blueprint symbol for resistors.
Circular and square mills(Both A and B)
--^V^V^V^---
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke

41. In most applications - what remains constant if the current remains constant and flows in one direction?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A difference in potential energy
Stranded
Electromagnetic field

42. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Grounding wire
1/1000th of an inch
Cables

43. What is a way to classify wires and cables?
By their covering
5%
Cables
Relay

44. How is capacitance determined?
The relationship of potential difference to current
Area and spacing of capacitor - static current in the capacitor(both A and B)
Wire splices
Stores electrical charge

45. The thermocouple uses which method for creating potential energy?
The relationship of potential difference to current
High resistance
Heat
50 Ohms

46. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
DC current
American wire gauge(AWG)
Start with the band on the end and read to the center

47. What is the unit of measurement of resistance?
Ohms
Amperes
First digit is 9
Magnetic properties

48. What can permanently break down a capacitor?
Stores electrical charge
Breakdown voltage
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Produce heat - light - or limit current to control it(all of the above)

49. What is a type of mechanical transducer?
Voltage
Solenoid and Relay(both A and B)
--^V^V^V^---
Opposes any change in the current flowing in a circuit

50. 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)
Common - not rechargable - gradually discharges when in storage(All of the above)
Symbol
Relationship between current and potential difference