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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. When reading resistance color codes - what does the first band indicate?
The rate of doing work
5%
Common - not rechargable - gradually discharges when in storage(All of the above)
First digit

2. What are the names of two of the six primary methods of producing a voltage?
Purging
Parallel
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Fixed - tapped - variable(all of the above)

3. Where does the thumb point in both Left-Hand Rules?
Gauge number
Ability to store an electric charge
The direction the negative charge moves
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

4. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
How much potential difference can a material withstand before breaking down
50 Ohms
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
10

5. What is a DC circuit characteristic?
First digit is 9
Choke
Solenoid and Relay(both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)

6. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Produce heat - light - or limit current to control it(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

7. What information do the Left-Hand Rules provide?
Mutual induction
Tolerence
Symbol
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

8. What does Ohm's Law represent?
Alternating current
Parallel circuit
The rate of doing work
Relationship between current and potential difference

9. How many kinds of poles do magnets have?
Volts
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat
Two

10. What is the use of the electromagnet?
12 volts
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cells can be connected together to make a battery
Voltmeter

11. What is the measure of potential difference?
Opposition to movement of free electrons
The rate of doing work
Volts
5%

12. How is the heat production measured in a resistor?
How much potential difference can a material withstand before breaking down
Fixed - tapped - variable(all of the above)
Silver
Potential difference - E*I - current times current change from point to point(all of the above)

13. What does a moving charge produce?
Porcelain
Current change in a coil creates a magnetic change
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A magnetic field

14. What is another name for an inductor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Choke
Composition of the resistor
Start with the band on the end and read to the center

15. The thermocouple uses which method for creating potential energy?
Voltmeter
--^V^V^V^---
Heat
Stranded

16. What cannot be transformed to higher or lower potential differences?
DC current
75 Ohms
Potential difference
Use an effect to produce another effect

17. When reading resistance color codes - what does the fourth band indicate?
First digit is 9
How much potential difference can a material withstand before breaking down
Tolerence
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

18. What do transducers do in electrical terms?
Cells can be connected together to make a battery
Use an effect to produce another effect
Electromagnetism
Potential difference

19. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Alternating current
Tolerence
Potential difference

20. 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
5%
The relationship of potential difference to current
12 volts
Opposes any change in the current flowing in a circuit

21. What do electrical charges need to cause a fire or explosion?
Porcelain
Stores electrical charge
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction the negative charge moves

22. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Energy
Parallel
Plastic - Rubber - Friction(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

23. What is a way to classify wires and cables?
Porcelain
Cables
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
By their covering

24. What is resistance in electrical terms?
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)
Opposition to electrical current
First digit is 9
Opposition to movement of free electrons

25. The generator is what method of creating potential energy?
The rate of doing work
Electromagnetism
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Voltage

26. What types of protective tapes are used?
How much potential difference can a material withstand before breaking down
Plastic - Rubber - Friction(all of the above)
Silver
Potential difference

27. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Gauge number
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electromagnetic field
10%

28. Which of the following materials is NOT a good conductor?
Unlike poles attract
Porcelain
Potential difference - E*I - current times current change from point to point(all of the above)
Start with the band on the end and read to the center

29. What is a characteristic of insulators?
Magnetic properties
12 volts
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Purging

30. What is the term for two or more cells attached together?
Stores electrical charge
50 Ohms
Battery
Relay

31. What is the purpose of resistors in electrical circuits?
Two
Produce heat - light - or limit current to control it(all of the above)
5%
Mutual induction

32. What is induction?
Parallel circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Area and spacing of capacitor - static current in the capacitor(both A and B)
Current change in a coil creates a magnetic change

33. A resistor is color coded brown - green - orange. What is its resistance?
Bonding and grounding
Relay
15 -000 ohms - 20%
A difference in potential energy

34. Which type of cell can be recharged?
Secondary cell
Fixed - Electrolytic - Variable(all of the above)
Alternating current
Potential difference - E*I - current times current change from point to point(all of the above)

35. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
The rate of doing work
Choke
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

36. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
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)
Moving vehicles

37. Why is the transformer important to AC electricity?

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38. What is a switch that operates by electricity?
Relay
Electromagnetism
Parallel circuit
Potential difference

39. What is voltage?
Grounding wire
Stranded
A difference in potential energy
Relationship between current and potential difference

40. What is the unit of measurement of potential difference?
Wire splices
Heat and current control(both a and c)
Potential difference
Volts

41. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Relationship between current and potential difference
Heat
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

42. What do we call the ability to do work?
Resistance increases as the conductor length increases
20%
Energy
1 watt

43. What determines whether a spark can be produced?
5%
Insulation resistance
Resistance increases as the conductor length increases
Strength of the charge

44. Identify the general blueprint symbol for inductors.
Resistance value can not be changed
The direction of the magnetic field
Symbol
Plastic - Rubber - Friction(all of the above)

45. What is the name for electrical resistance of insulation?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy
Parallel
Insulation resistance

46. What is resistance?
Opposition to movement of free electrons
Voltmeter
Use an effect to produce another effect
By their covering

47. What is capacitance in electrical terms?
Composition of the resistor
Porcelain
Ability to store an electric charge
Insulation resistance

48. What does resistance produce?
First digit is 9
Wire splices
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat

49. What makes electrons flow?
Grounding wire
Symbol
Opposes any change in the current flowing in a circuit
Potential difference

50. What is a common form used in conductors?
Secondary cell
Cables
Current flows in one direction - potential differences across a load does not change(Both A and B)
15 -000 ohms - 20%