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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. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Opposition to electrical current
Opposition to movement of free electrons
1/1000th of an inch

2. What is the unit of measurement of resistance?
Ohms
Cell
Strength of the charge
Fixed - tapped - variable(all of the above)

3. What results when current is run through a material with high resistance?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Solenoid and Relay(both A and B)
Heat and current control(both a and c)
20%

4. Identify the blueprint symbol for resistors.
Potential difference - E*I - current times current change from point to point(all of the above)
Cells can be connected together to make a battery
--^V^V^V^---
Symbol

5. What is resistance in electrical terms?
Ohms
Heat
Bonding and grounding
Opposition to electrical current

6. Which of the following materials is NOT a good conductor?
Parallel
Use an effect to produce another effect
Produce heat - light - or limit current to control it(all of the above)
Porcelain

7. What does resistance produce?
First digit is 9
--^V^V^V^---
Bare - covered - insulated - stranded - cable(All of the above)
Heat

8. 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
By their covering
The direction of the magnetic field
12 volts
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)

9. What is the use of the electromagnet?
Cell
Amperes
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Composition of the resistor

10. Which type of cell can be recharged?
Current change in a coil creates a magnetic change
Secondary cell
First digit is 9
Common - not rechargable - gradually discharges when in storage(All of the above)

11. What is another name for an inductor?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol
50 Ohms
Choke

12. What is a characteristic of insulators?
50 Ohms
Chemical action
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Volts

13. What do we call the ability to do work?
Magnetic properties
Battery
Energy
Symbol

14. What are the names of two of the six primary methods of producing a voltage?
1/1000th of an inch
Chemical action - electromagnetism - contact - heat - light - deformation(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)
Resistance increases as the conductor length increases

15. What is a way to classify wires and cables?
American wire gauge(AWG)
By their covering
10
Grounding wire

16. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Solenoid and Relay(both A and B)
Potential difference
Parallel
5%

17. What makes electrons flow?
Symbol
Potential difference
The rate of doing work
Opposes any change in the current flowing in a circuit

18. What is a type of mechanical transducer?
Resistance increases as the conductor length increases
Cables
Secondary cell
Solenoid and Relay(both A and B)

19. Why is the transformer important to AC electricity?

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20. What is the term for two or more cells attached together?
First digit is 9
Silver
Solenoid and Relay(both A and B)
Battery

21. What instrument measures voltage?
Gauge number
Strength of the charge
Current change in a coil creates a magnetic change
Voltmeter

22. What is dielectric strength?
Stores electrical charge
Stranded
How much potential difference can a material withstand before breaking down
A magnetic field

23. What is induction?
Potential difference
Current change in a coil creates a magnetic change
Opposition to electrical current
5%

24. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
10%
The direction of the magnetic field

25. What is the name for electrical resistance of insulation?
Fixed - Electrolytic - Variable(all of the above)
Relay
10%
Insulation resistance

26. What are the common units of measurement for round and square conductor cross - sections?
A difference in potential energy
The rate of doing work
Circular and square mills(Both A and B)
Stranded

27. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
12 volts
Plastic - Rubber - Friction(all of the above)
10%

28. What is power?
Insulation resistance
The rate of doing work
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Plastic - Rubber - Friction(all of the above)

29. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Volts
Composition of the resistor
1/1000th of an inch
10%

30. A resistor is color coded brown - green - orange. What is its resistance?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
15 -000 ohms - 20%
Mutual induction

31. What is resistance?
Use an effect to produce another effect
Parallel circuit
Ohms
Opposition to movement of free electrons

32. What is a type of capacitor?
Symbol
Two
Resistance value can not be changed
Fixed - Electrolytic - Variable(all of the above)

33. What do transducers do in electrical terms?
Cells can be connected together to make a battery
Cables
Voltage
Use an effect to produce another effect

34. What wire measurement is commonly used in the U.S.?
Strength of the charge
Porcelain
American wire gauge(AWG)
Area and spacing of capacitor - static current in the capacitor(both A and B)

35. When reading resistance color codes - what does the fourth band indicate?
Heat and current control(both a and c)
Bare - covered - insulated - stranded - cable(All of the above)
Plastic - Rubber - Friction(all of the above)
Tolerence

36. 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
Fixed - tapped - variable(all of the above)
Ohms
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
75 Ohms

37. What is the relationship of conductor size and length to resistance?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Series circuit
Resistance increases as the conductor length increases
Cables

38. What determines whether a spark can be produced?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Two
Strength of the charge
Electrical resistance against the flow of current

39. In most applications - what remains constant if the current remains constant and flows in one direction?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Electromagnetic field
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Bonding and grounding

40. What information do the Left-Hand Rules provide?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Ohms
Symbol

41. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Produce heat - light - or limit current to control it(all of the above)
Resistance value can not be changed
Mutual induction
Serial

42. What is a common cause of static electricity in a shop?
20%
Moving vehicles
5%
Electromagnetism

43. What type of circuit has one path of follow through a load?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Series circuit
Voltmeter
Relay

44. The thermocouple uses which method for creating potential energy?
Heat
Cables
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

45. What does a third band of brown mean?
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)
12 volts
10
Heat and current control(both a and c)

46. What is capacitance in electrical terms?
Stores electrical charge
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Ability to store an electric charge
Amperes

47. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
The rate of doing work
Plastic - Rubber - Friction(all of the above)
Purging
Start with the band on the end and read to the center

48. What do junction boxes protect?
Wire splices
10
Ohms
Current change in a coil creates a magnetic change

49. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Heat
Voltmeter
Parallel
75 Ohms

50. What must be large enough to carry the largest current likely to occur?
Stores electrical charge
Common - not rechargable - gradually discharges when in storage(All of the above)
12 volts
Grounding wire