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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 are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Common - not rechargable - gradually discharges when in storage(All of the above)
Choke
Parallel
Does not move

2. What is the relationship between cells and batteries?
Unlike poles attract
Cells can be connected together to make a battery
Heat
Bare - covered - insulated - stranded - cable(All of the above)

3. What is an electromagnet?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposition to electrical current
Electromagnetic field

4. What is a type of capacitor?
Symbol
Fixed - Electrolytic - Variable(all of the above)
Cables
Composition of the resistor

5. What is resistance in electrical terms?
75 Ohms
Parallel circuit
Opposition to electrical current
The direction of the magnetic field

6. What is the term for two or more cells attached together?
Battery
10%
DC flows continuously in one direction and AC potential difference and current both change direction
Voltmeter

7. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
--^V^V^V^---
50 Ohms
Voltmeter
Gauge number

8. What does Ohm's Law represent?
The direction the negative charge moves
Cell
Relationship between current and potential difference
Electromagnetism

9. Which of the following materials is NOT a good conductor?
Moving vehicles
American wire gauge(AWG)
Porcelain
Voltage

10. How do you read resistor color codes?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cell
Start with the band on the end and read to the center

11. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Energy
1 watt
Parallel

12. What determines whether a spark can be produced?
Strength of the charge
--^V^V^V^---
Plastic - Rubber - Friction(all of the above)
Stranded

13. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
High resistance
Common - not rechargable - gradually discharges when in storage(All of the above)

14. What is insulation resistance?
Bonding and grounding
Electrical resistance against the flow of current
Opposes any change in the current flowing in a circuit
Serial

15. What is a characteristic of a fixed resistor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts
Resistance value can not be changed
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

16. What do we call the ability to do work?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
Energy
Composition of the resistor

17. What wire measurement is commonly used in the U.S.?
Purging
Potential difference - E*I - current times current change from point to point(all of the above)
Cell
American wire gauge(AWG)

18. What do electrical charges need to cause a fire or explosion?
Resistance value can not be changed
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
A difference in potential energy
Tolerence

19. What is a way to classify wires and cables?
Voltage
Heat
Use an effect to produce another effect
By their covering

20. The generator is what method of creating potential energy?
Volts
Alternating current
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)
Electromagnetism

21. Identify the blueprint symbol for capacitors.
Symbol
Composition of the resistor
Choke
A difference in potential energy

22. What is dielectric strength?
5%
How much potential difference can a material withstand before breaking down
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

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

24. The thermocouple uses which method for creating potential energy?
Use an effect to produce another effect
Relationship between current and potential difference
Solenoid and Relay(both A and B)
Heat

25. What makes electrons flow?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
High resistance
Potential difference
Circular and square mills(Both A and B)

26. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
5%
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

27. What is the use of the electromagnet?
First digit is 9
The direction of the magnetic field
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts

28. What is another name for an inductor?
Ohms
Moving vehicles
Choke
Insulation resistance and Dielectric strength(Both A and B)

29. What type of circuit has one path of follow through a load?
Parallel
Series circuit
Potential difference - E*I - current times current change from point to point(all of the above)
Stranded

30. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
--^V^V^V^---
The rate of doing work
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

31. What is the type of cable composed of many fine wires?
Stranded
A magnetic field
Electromagnetic field
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

32. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
75 Ohms
--^V^V^V^---
From the negative battery terminal to the positive terminal
20%

33. What is induction?
American wire gauge(AWG)
Stores electrical charge
Current change in a coil creates a magnetic change
How much potential difference can a material withstand before breaking down

34. What is the name for electrical resistance of insulation?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Stores electrical charge
Insulation resistance
Alternating current

35. The dry cell is what method for creating potential energy?
Chemical action
Electrical resistance against the flow of current
Grounding wire
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

36. To what measurement do the conductor mills refer?
1/1000th of an inch
From the negative battery terminal to the positive terminal
Opposition to electrical current
Cells can be connected together to make a battery

37. What instrument measures voltage?
Cells can be connected together to make a battery
Symbol
Voltmeter
Composition of the resistor

38. What is the basic law of magnetic force?
DC current
From the negative battery terminal to the positive terminal
Relay
Unlike poles attract

39. A resistor is color coded brown - green - orange. What is its resistance?
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons
Parallel
15 -000 ohms - 20%

40. What is the term for doing work at the rate of joule per second?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
1/1000th of an inch
Current change in a coil creates a magnetic change
1 watt

41. What is the measure of potential difference?
Parallel
Magnetic properties
Volts
First digit is 9

42. What is true about a dry cell?
DC flows continuously in one direction and AC potential difference and current both change direction
Volts
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)

43. What does static electricity do?
Does not move
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Silver
Parallel

44. How is capacitance determined?
20%
By their covering
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy

45. What is power?
The rate of doing work
Electromagnetic field
Fixed - Electrolytic - Variable(all of the above)
Insulation resistance

46. 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
5%
75 Ohms
1 watt
Plastic - Rubber - Friction(all of the above)

47. What is a common cause of static electricity in a shop?
Magnetic properties
Moving vehicles
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)

48. What is voltage?
Energy
A difference in potential energy
10%
50 Ohms

49. What makes electrons flow?
Potential difference
Heat
Relay
Voltage

50. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Heat
5%
Cables
Bonding and grounding