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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 a characteristic of a fixed resistor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Resistance value can not be changed
Wire splices
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)

2. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(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)
Two
Potential difference

3. Which way is the current going in the circuit shown?(electron flow)
Start with the band on the end and read to the center
Tolerence
From the negative battery terminal to the positive terminal
1/1000th of an inch

4. Identify the blueprint symbol for resistors.
--^V^V^V^---
1 watt
Strength of the charge
Ability to store an electric charge

5. What is the basic law of magnetic force?
Strength of the charge
Area and spacing of capacitor - static current in the capacitor(both A and B)
Unlike poles attract
Wire splices

6. What is a common cause of static electricity in a shop?
Unlike poles attract
Insulation resistance and Dielectric strength(Both A and B)
Parallel
Moving vehicles

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

8. The thermocouple uses which method for creating potential energy?
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms
Heat
Silver

9. What does a moving charge produce?
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 magnetic field
Moving vehicles
Fixed - Electrolytic - Variable(all of the above)

10. Identify the blueprint symbol for capacitors.
A magnetic field
Stores electrical charge
Start with the band on the end and read to the center
Symbol

11. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Ohms
5%
Plastic - Rubber - Friction(all of the above)
50 Ohms

12. How is capacitance determined?
Purging
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Circular and square mills(Both A and B)

13. What do transducers do in electrical terms?
Current change in a coil creates a magnetic change
Unlike poles attract
Grounding wire
Use an effect to produce another effect

14. What determines the resistance of a resistor?
The direction the negative charge moves
A difference in potential energy
Composition of the resistor
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

15. What does a transformer transform?
The relationship of potential difference to current
75 Ohms
By their covering
1 watt

16. What is a switch that operates by electricity?
Relay
Secondary cell
Fixed - tapped - variable(all of the above)
Breakdown voltage

17. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat and current control(both a and c)
From the negative battery terminal to the positive terminal

18. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Electromagnetism
10%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

19. What are the two generic methods to eliminate static electricity from metal objects?
10%
Plastic - Rubber - Friction(all of the above)
Bonding and grounding
Parallel

20. Identify the general blueprint symbol for inductors.
Symbol
Two
Cells can be connected together to make a battery
Heat and current control(both a and c)

21. What is a property of inductors in electrical circuits?
Symbol
Opposes any change in the current flowing in a circuit
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)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

22. What is needed for electric heating elements and the filaments of light bulbs?
Alternating current
High resistance
Insulation resistance
Wire splices

23. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Stores electrical charge
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Fixed - Electrolytic - Variable(all of the above)

24. What is the unit of measurement of potential difference?
Does not move
Solenoid and Relay(both A and B)
Volts
Ability to store an electric charge

25. What is a type of mechanical transducer?
Wire splices
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Solenoid and Relay(both A and B)
A magnetic field

26. What information do the Left-Hand Rules provide?
Bonding and grounding
Porcelain
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
A magnetic field

27. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
From the negative battery terminal to the positive terminal
Current flows in one direction - potential differences across a load does not change(Both A and B)
Serial

28. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Battery
Secondary cell
Cell

29. How do you read resistor color codes?
Cell
Start with the band on the end and read to the center
Potential difference - E*I - current times current change from point to point(all of the above)
A magnetic field

30. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Composition of the resistor

31. What makes electrons flow?
Start with the band on the end and read to the center
The rate of doing work
A difference in potential energy
Potential difference

32. What is the name for electrical resistance of insulation?
Insulation resistance
1/1000th of an inch
Resistance increases as the conductor length increases
Resistance value can not be changed

33. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Cables
10%
Silver
Opposes any change in the current flowing in a circuit

34. 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
12 volts
First digit is 9
American wire gauge(AWG)
Purging

35. In most applications - what remains constant if the current remains constant and flows in one direction?
Potential difference - E*I - current times current change from point to point(all of the above)
Electromagnetic field
Strength of the charge
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

36. What is power?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Battery
Choke
The rate of doing work

37. When reading resistance color codes - what does the first band indicate?
The relationship of potential difference to current
Volts
Current change in a coil creates a magnetic change
First digit

38. What does Ohm's Law represent?
Relationship between current and potential difference
Common - not rechargable - gradually discharges when in storage(All of the above)
From the negative battery terminal to the positive terminal
Produce heat - light - or limit current to control it(all of the above)

39. What is insulation resistance?
Electrical resistance against the flow of current
Amperes
First digit is 9
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

40. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Stores electrical charge
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
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)

41. What can permanently break down a capacitor?
15 -000 ohms - 20%
Bonding and grounding
Breakdown voltage
Purging

42. What is the type of cable composed of many fine wires?
Stranded
Symbol
By their covering
Ability to store an electric charge

43. What is induction?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Current change in a coil creates a magnetic change
Tolerence
Solenoid and Relay(both A and B)

44. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(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)
Parallel circuit
Insulation resistance

45. Where do the fingers point in both Left-Hand Rules?
Potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Symbol
The direction of the magnetic field

46. What is the purpose of a raceway?
Symbol
Purging
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)

47. Which type of cell can be recharged?
Purging
Opposes any change in the current flowing in a circuit
Secondary cell
Parallel circuit

48. Which material has the lowest resistance at ordinary temperatures?
Silver
10%
Breakdown voltage
Potential difference

49. What does static electricity do?
Does not move
Potential difference - E*I - current times current change from point to point(all of the above)
--^V^V^V^---
10%

50. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Wire splices
Breakdown voltage