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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 does Ohm's Law represent?
Does not move
Relationship between current and potential difference
Plastic - Rubber - Friction(all of the above)
Potential difference

2. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
First digit
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Purging
Opposition to movement of free electrons

3. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Heat
Symbol
A magnetic field
5%

4. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Chemical action
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Potential difference

5. When reading resistance color codes - what does the fourth band indicate?
Electrical resistance against the flow of current
Insulation resistance
Tolerence
Start with the band on the end and read to the center

6. The thermocouple uses which method for creating potential energy?
Amperes
Heat
Series circuit
10

7. What is a DC circuit characteristic?
Heat
Cell
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat

8. What is capacitance in electrical terms?
Relationship between current and potential difference
Mutual induction
Ability to store an electric charge
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

9. 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
Serial
75 Ohms
Ohms
Two

10. What does resistance produce?
Potential difference - E*I - current times current change from point to point(all of the above)
DC current
Unlike poles attract
Heat

11. What are the names of two of the six primary methods of producing a voltage?
75 Ohms
Grounding wire
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
12 volts

12. What is an arrangement of materials that create a potential difference by chemistry?
Fixed - tapped - variable(all of the above)
Unlike poles attract
Symbol
Cell

13. What determines the resistance of a resistor?
Composition of the resistor
Magnetic properties
15 -000 ohms - 20%
How much potential difference can a material withstand before breaking down

14. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
1/1000th of an inch
Battery
Use an effect to produce another effect

15. What can permanently break down a capacitor?
10
10%
Opposition to movement of free electrons
Breakdown voltage

16. What is another name for an inductor?
From the negative battery terminal to the positive terminal
Choke
A difference in potential energy
Start with the band on the end and read to the center

17. What is a characteristic of a fixed resistor?
Resistance value can not be changed
Silver
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposes any change in the current flowing in a circuit

18. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Bare - covered - insulated - stranded - cable(All of the above)
Relay
Parallel
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

19. What do junction boxes protect?
Parallel
Start with the band on the end and read to the center
DC flows continuously in one direction and AC potential difference and current both change direction
Wire splices

20. What is resistance in electrical terms?
Series circuit
Opposition to electrical current
Unlike poles attract
Insulation resistance

21. Identify the blueprint symbol for capacitors.
Cell
High resistance
Symbol
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

22. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Amperes
Heat and current control(both a and c)
Alternating current
--^V^V^V^---

23. The generator is what method of creating potential energy?
Voltage
1/1000th of an inch
Electromagnetism
Fixed - tapped - variable(all of the above)

24. What is true about a dry cell?
Grounding wire
12 volts
Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)

25. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Relationship between current and potential difference
First digit
Bonding and grounding

26. Which material has the lowest resistance at ordinary temperatures?
5%
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Silver
Heat and current control(both a and c)

27. What do transducers do in electrical terms?
Energy
Use an effect to produce another effect
Series circuit
Grounding wire

28. How is capacitance determined?
Heat
Volts
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy

29. What is a type of mechanical transducer?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Potential difference
Solenoid and Relay(both A and B)
Fixed - Electrolytic - Variable(all of the above)

30. What do we call the ability to do work?
Magnetic properties
Energy
Battery
Volts

31. What is the term for doing work at the rate of joule per second?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
1 watt
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

32. 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
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Ohms
Chemical action

33. What is the unit of measurement of potential difference?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Unlike poles attract
Volts
20%

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

35. What is resistance?
Ohms
Strength of the charge
Opposition to movement of free electrons
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

36. What is a switch that operates by electricity?
Potential difference
Relay
Porcelain
Produce heat - light - or limit current to control it(all of the above)

37. What does a first band of white mean?
20%
Opposes any change in the current flowing in a circuit
Common - not rechargable - gradually discharges when in storage(All of the above)
First digit is 9

38. When reading resistance color codes - what does the first band indicate?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Start with the band on the end and read to the center
First digit
Composition of the resistor

39. What is a conductor?
Energy
Wire splices
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10

40. In most applications - what remains constant if the current remains constant and flows in one direction?
Resistance value can not be changed
Does not move
Stranded
Electromagnetic field

41. What makes electrons flow?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Potential difference
10
Plastic - Rubber - Friction(all of the above)

42. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Insulation resistance
Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

43. Identify the general blueprint symbol for inductors.
Insulation resistance and Dielectric strength(Both A and B)
Choke
Energy
Symbol

44. Identify the blueprint symbol for resistors.
How much potential difference can a material withstand before breaking down
5%
--^V^V^V^---
Fixed - Electrolytic - Variable(all of the above)

45. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Series circuit
Energy
Voltage
Fixed - Electrolytic - Variable(all of the above)

46. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
A difference in potential energy
Silver
The direction of the magnetic field
20%

47. Which type of cell can be recharged?
5%
Insulation resistance
20%
Secondary cell

48. The dry cell is what method for creating potential energy?
Two
Chemical action
Resistance value can not be changed
First digit is 9

49. How do you read resistor color codes?
American wire gauge(AWG)
Start with the band on the end and read to the center
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Porcelain

50. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Ability to store an electric charge
Tolerence
5%