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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 type of circuit has one path of follow through a load?
Series circuit
1 watt
Bonding and grounding
5%

2. What type of circuit has two or more paths for current to follow?
Parallel 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)
Current change in a coil creates a magnetic change
Heat

3. What is the type of cable composed of many fine wires?
Strength of the charge
First digit is 9
Current flows in one direction - potential differences across a load does not change(Both A and B)
Stranded

4. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Produce heat - light - or limit current to control it(all of the above)
Resistance value can not be changed
Common - not rechargable - gradually discharges when in storage(All of the above)

5. What is a conductor?
50 Ohms
Wire splices
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Two

6. What determines whether a spark can be produced?
Strength of the charge
Insulation resistance
The relationship of potential difference to current
Unlike poles attract

7. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Potential difference - E*I - current times current change from point to point(all of the above)
Circular and square mills(Both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)
5%

8. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Stranded
Symbol
Potential difference - E*I - current times current change from point to point(all of the above)
Mutual induction

9. What cannot be transformed to higher or lower potential differences?
DC 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)
Does not move
Bare - covered - insulated - stranded - cable(All of the above)

10. Where do the fingers point in both Left-Hand Rules?
Chemical action
Parallel circuit
Symbol
The direction of the magnetic field

11. How many kinds of poles do magnets have?
A magnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)
Magnetic properties
Two

12. What is the fundamental property of insulators?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Tolerence
Plastic - Rubber - Friction(all of the above)
Insulation resistance and Dielectric strength(Both A and B)

13. What does a transformer transform?
Tolerence
The relationship of potential difference to current
Symbol
Opposes any change in the current flowing in a circuit

14. What is the use of the electromagnet?
By their covering
Potential difference
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Produce heat - light - or limit current to control it(all of the above)

15. To what measurement do the conductor mills refer?
DC current
1/1000th of an inch
12 volts
10

16. 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
Electromagnetic field
Mutual induction
12 volts
Solenoid and Relay(both A and B)

17. What is a common form used in conductors?
Battery
By their covering
Cables
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

18. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Mutual induction
Produce heat - light - or limit current to control it(all of the above)
Alternating current
Grounding wire

19. What wire measurement is commonly used in the U.S.?
By their covering
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
--^V^V^V^---
American wire gauge(AWG)

20. What is another name for an inductor?
Silver
20%
A magnetic field
Choke

21. What does Ohm's Law represent?
Volts
Relationship between current and potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Use an effect to produce another effect

22. What is a type of mechanical transducer?
--^V^V^V^---
1/1000th of an inch
Solenoid and Relay(both A and B)
Fixed - tapped - variable(all of the above)

23. What instrument measures voltage?
Cables
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Serial
Voltmeter

24. What is the term for two or more cells attached together?
Battery
The direction of the magnetic field
Electromagnetic field
Voltage

25. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Energy
Serial
Symbol
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

26. What is a characteristic of insulators?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Circular and square mills(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat

27. The generator is what method of creating potential energy?
Electromagnetism
Resistance increases as the conductor length increases
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Unlike poles attract

28. What is a switch that operates by electricity?
Energy
Relay
The direction of the magnetic field
Serial

29. What is induction?
Solenoid and Relay(both A and B)
Stranded
Current change in a coil creates a magnetic change
DC flows continuously in one direction and AC potential difference and current both change direction

30. Which material has the lowest resistance at ordinary temperatures?
Grounding wire
Magnetic properties
Breakdown voltage
Silver

31. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Porcelain
How much potential difference can a material withstand before breaking down
Plastic - Rubber - Friction(all of the above)

32. 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
75 Ohms
Cell
Series circuit
5%

33. What is a common measure of wire diameter?
Volts
Gauge number
10
First digit is 9

34. What are the names of two of the six primary methods of producing a voltage?
--^V^V^V^---
Series circuit
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

35. A resistor is color coded brown - green - orange. What is its resistance?
Parallel circuit
Purging
From the negative battery terminal to the positive terminal
15 -000 ohms - 20%

36. What types of protective tapes are used?
20%
10%
--^V^V^V^---
Plastic - Rubber - Friction(all of the above)

37. What is the purpose of capacitors in electrical circuits?
15 -000 ohms - 20%
Stores electrical charge
Opposition to movement of free electrons
Common - not rechargable - gradually discharges when in storage(All of the above)

38. What does an object have if a magnetic field acts on it?
Alternating current
First digit
Magnetic properties
Secondary cell

39. What is a wire classification?
Serial
First digit is 9
Bare - covered - insulated - stranded - cable(All of the above)
15 -000 ohms - 20%

40. What is the term for doing work at the rate of joule per second?
1 watt
Opposes any change in the current flowing in a circuit
Two
Resistance increases as the conductor length increases

41. When reading resistance color codes - what does the fourth band indicate?
Tolerence
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Resistance increases as the conductor length increases

42. Why is the transformer important to AC electricity?

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43. What is needed for electric heating elements and the filaments of light bulbs?
Insulation resistance
Solenoid and Relay(both A and B)
High resistance
Current change in a coil creates a magnetic change

44. What is the purpose of resistors in electrical circuits?
Insulation resistance and Dielectric strength(Both A and B)
Porcelain
Produce heat - light - or limit current to control it(all of the above)
Silver

45. Identify the blueprint symbol for capacitors.
Symbol
The relationship of potential difference to current
Stranded
Start with the band on the end and read to the center

46. What must be large enough to carry the largest current likely to occur?
The direction of the magnetic field
15 -000 ohms - 20%
Grounding wire
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

47. What does a third band of brown mean?
20%
Stores electrical charge
10
A magnetic field

48. Which way is the current going in the circuit shown?(electron flow)
Common - not rechargable - gradually discharges when in storage(All of the above)
From the negative battery terminal to the positive terminal
Symbol
Resistance value can not be changed

49. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Grounding wire
Choke
20%

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