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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 cannot be transformed to higher or lower potential differences?
Porcelain
DC current
Symbol
20%

2. What does a first band of white mean?
Stranded
1/1000th of an inch
15 -000 ohms - 20%
First digit is 9

3. What makes electrons flow?
Opposition to electrical 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)
Potential difference
Heat and current control(both a and c)

4. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Energy
Two
20%

5. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Solenoid and Relay(both A and B)
Voltmeter
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

6. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat
Potential difference - E*I - current times current change from point to point(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

7. What is needed for electric heating elements and the filaments of light bulbs?
Bare - covered - insulated - stranded - cable(All of the above)
High resistance
The direction the negative charge moves
Produce heat - light - or limit current to control it(all of the above)

8. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
10%
The rate of doing work
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
5%

9. What is the name for electrical resistance of insulation?
Insulation resistance
10%
Porcelain
Energy

10. What is the relationship of conductor size and length to resistance?
10
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10%
Resistance increases as the conductor length increases

11. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Plastic - Rubber - Friction(all of the above)
Unlike poles attract
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

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

13. What makes electrons flow?
DC current
Tolerence
Wire splices
Potential difference

14. What is an electromagnet?
Battery
Wire splices
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
15 -000 ohms - 20%

15. A resistor is color coded brown - green - orange. What is its resistance?
Silver
75 Ohms
20%
15 -000 ohms - 20%

16. Which type of cell can be recharged?
Heat
Secondary cell
Electromagnetic field
Series circuit

17. What types of protective tapes are used?
Resistance increases as the conductor length increases
Unlike poles attract
Plastic - Rubber - Friction(all of the above)
Alternating current

18. What is the type of cable composed of many fine wires?
10%
By their covering
Choke
Stranded

19. How many kinds of poles do magnets have?
1/1000th of an inch
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)
The rate of doing work
Two

20. Which of the following materials is NOT a good conductor?
Does not move
Symbol
Resistance value can not be changed
Porcelain

21. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
5%
Mutual induction
American wire gauge(AWG)

22. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
1/1000th of an inch
Solenoid and Relay(both A and B)
Serial
Wire splices

23. Which material has the lowest resistance at ordinary temperatures?
A magnetic field
Potential difference - E*I - current times current change from point to point(all of the above)
Silver
5%

24. When reading resistance color codes - what does the first band indicate?
First digit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Circular and square mills(Both A and B)
5%

25. What is a conductor?
Fixed - tapped - variable(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Current flows in one direction - potential differences across a load does not change(Both A and B)
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)

26. What is another name for an inductor?
Magnetic properties
Choke
Volts
Insulation resistance and Dielectric strength(Both A and B)

27. What is resistance in electrical terms?
Serial
Purging
Potential difference - E*I - current times current change from point to point(all of the above)
Opposition to electrical current

28. What is the relationship between magnetism and electricity?
Series circuit
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)
Choke
Bonding and grounding

29. What do we call the ability to do work?
Serial
Electrical resistance against the flow of current
Energy
Opposition to electrical current

30. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
The rate of doing work
Two
The direction of the magnetic field

31. What type of circuit has two or more paths for current to follow?
Alternating current
1 watt
Parallel circuit
Stranded

32. To what measurement do the conductor mills refer?
1/1000th of an inch
Voltage
Electromagnetism
1 watt

33. What do junction boxes protect?
Cables
Wire splices
The relationship of potential difference to current
Opposes any change in the current flowing in a circuit

34. What does static electricity do?
Does not move
Circular and square mills(Both A and B)
Volts
Fixed - Electrolytic - Variable(all of the above)

35. Identify the general blueprint symbol for inductors.
Parallel
Symbol
Parallel circuit
A magnetic field

36. 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
20%
Grounding wire
75 Ohms
Cell

37. What is the unit of measurement of electrical current?
Cells can be connected together to make a battery
Relationship between current and potential difference
12 volts
Amperes

38. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
From the negative battery terminal to the positive terminal
Parallel
Purging
Current flows in one direction - potential differences across a load does not change(Both A and B)

39. Where do the fingers point in both Left-Hand Rules?
Resistance value can not be changed
The rate of doing work
Energy
The direction of the magnetic field

40. What is the unit of measurement of resistance?
Ohms
Gauge number
Potential difference
Battery

41. What is the measure of potential difference?
First digit
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)
Volts
Serial

42. What is the relationship between cells and batteries?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cells can be connected together to make a battery
Opposes any change in the current flowing in a circuit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

43. What is an arrangement of materials that create a potential difference by chemistry?
Cell
Potential difference
Area and spacing of capacitor - static current in the capacitor(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction

44. What is capacitance in electrical terms?
Relay
Current flows in one direction - potential differences across a load does not change(Both A and B)
1/1000th of an inch
Ability to store an electric charge

45. What is the term for doing work at the rate of joule per second?
1 watt
Choke
10
Resistance value can not be changed

46. What is a type of mechanical transducer?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
--^V^V^V^---
Solenoid and Relay(both A and B)
First digit

47. Identify the blueprint symbol for resistors.
Opposition to movement of free electrons
--^V^V^V^---
Current change in a coil creates a magnetic change
Cables

48. What is insulation resistance?
Plastic - Rubber - Friction(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Electrical resistance against the flow of current
Ability to store an electric charge

49. What do electrical charges need to cause a fire or explosion?
Use an effect to produce another effect
Relay
Plastic - Rubber - Friction(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

50. What does a transformer transform?
DC flows continuously in one direction and AC potential difference and current both change direction
The relationship of potential difference to current
Voltage
Fixed - Electrolytic - Variable(all of the above)