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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. 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
Opposition to electrical current
75 Ohms
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Alternating current

2. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Circular and square mills(Both A and B)
Relay
10%
Current flows in one direction - potential differences across a load does not change(Both A and B)

3. What does resistance produce?
Heat
Cables
First digit
Solenoid and Relay(both A and B)

4. What is a way to classify wires and cables?
Parallel circuit
By their covering
Purging
Ability to store an electric charge

5. What is a type of mechanical transducer?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Solenoid and Relay(both A and B)
Choke
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

6. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Battery
12 volts
Parallel circuit

7. What is a conductor?
Volts
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)
Potential difference
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

8. In most applications - what remains constant if the current remains constant and flows in one direction?
10
Electromagnetic field
The direction of the magnetic field
Volts

9. Which of the following materials is NOT a good conductor?
Two
DC flows continuously in one direction and AC potential difference and current both change direction
Porcelain
Potential difference - E*I - current times current change from point to point(all of the above)

10. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Voltage
Porcelain
Cables

11. When reading resistance color codes - what does the fourth band indicate?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
50 Ohms
Tolerence
DC flows continuously in one direction and AC potential difference and current both change direction

12. How is capacitance determined?
Moving vehicles
Heat
Area and spacing of capacitor - static current in the capacitor(both A and B)
Stores electrical charge

13. What is the purpose of a raceway?
5%
Bare - covered - insulated - stranded - cable(All of the above)
Voltmeter
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

14. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Silver
Parallel circuit
Relay

15. The thermocouple uses which method for creating potential energy?
Series circuit
Heat
Cell
Bare - covered - insulated - stranded - cable(All of the above)

16. What do transducers do in electrical terms?
Two
Purging
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Use an effect to produce another effect

17. What does static electricity do?
First digit is 9
Does not move
The relationship of potential difference to current
DC flows continuously in one direction and AC potential difference and current both change direction

18. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
The relationship of potential difference to current
Breakdown voltage
5%
Two

19. What does a moving charge produce?
Opposition to electrical current
Does not move
Voltmeter
A magnetic field

20. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC current
Porcelain
Bare - covered - insulated - stranded - cable(All of the above)

21. Why is the transformer important to AC electricity?

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22. What is an arrangement of materials that create a potential difference by chemistry?
Cell
Solenoid and Relay(both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
--^V^V^V^---

23. What does an object have if a magnetic field acts on it?
Strength of the charge
Magnetic properties
Produce heat - light - or limit current to control it(all of the above)
Fixed - Electrolytic - Variable(all of the above)

24. What do we call the ability to do work?
Energy
The rate of doing work
Cell
Opposition to movement of free electrons

25. What must be large enough to carry the largest current likely to occur?
The rate of doing work
Grounding wire
The direction the negative charge moves
Moving vehicles

26. Which material has the lowest resistance at ordinary temperatures?
Silver
Heat
Gauge number
Strength of the charge

27. What is a switch that operates by electricity?
Parallel circuit
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)
Relay

28. What is the relationship between magnetism and electricity?
Fixed - tapped - variable(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)
15 -000 ohms - 20%
Moving vehicles

29. 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)
Relay
Stores electrical charge
Relationship between current and potential difference

30. What cannot be transformed to higher or lower potential differences?
Fixed - Electrolytic - Variable(all of the above)
Alternating current
Two
DC current

31. What is the name for electrical resistance of insulation?
Circular and square mills(Both A and B)
5%
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Insulation resistance

32. What makes electrons flow?
Potential difference
Fixed - tapped - variable(all of the above)
1 watt
Opposition to movement of free electrons

33. What is the term for two or more cells attached together?
By their covering
Amperes
Battery
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

34. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat
Resistance value can not be changed
12 volts

35. What is the term for doing work at the rate of joule per second?
Choke
10
Amperes
1 watt

36. How do you read resistor color codes?
12 volts
Start with the band on the end and read to the center
Porcelain
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)

37. What is capacitance in electrical terms?
Ability to store an electric charge
75 Ohms
Purging
How much potential difference can a material withstand before breaking down

38. 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)
Secondary cell
The direction the negative charge moves
Potential difference

39. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
American wire gauge(AWG)
DC flows continuously in one direction and AC potential difference and current both change direction
Current change in a coil creates a magnetic change
50 Ohms

40. To what measurement do the conductor mills refer?
Symbol
50 Ohms
High resistance
1/1000th of an inch

41. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Two
20%
American wire gauge(AWG)

42. What is power?
--^V^V^V^---
The rate of doing work
High resistance
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

43. A resistor is color coded brown - green - orange. What is its resistance?
50 Ohms
From the negative battery terminal to the positive terminal
15 -000 ohms - 20%
Secondary cell

44. The dry cell is what method for creating potential energy?
Chemical action
Fixed - Electrolytic - Variable(all of the above)
Alternating current
By their covering

45. What can permanently break down a capacitor?
Opposition to electrical current
10
Breakdown voltage
Ability to store an electric charge

46. What does a transformer transform?
75 Ohms
The relationship of potential difference to current
The rate of doing work
Ohms

47. How do static charges distribute themselves?
10
Heat
12 volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

48. What determines whether a spark can be produced?
Strength of the charge
The rate of doing work
First digit is 9
Moving vehicles

49. What do electrical charges need to cause a fire or explosion?
Tolerence
75 Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetic field

50. What is the relationship between cells and batteries?
Series circuit
Strength of the charge
Cells can be connected together to make a battery
1 watt