Test your basic knowledge |

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. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Opposes any change in the current flowing in a circuit
DC flows continuously in one direction and AC potential difference and current both change direction
The rate of doing work

2. What is the relationship between cells and batteries?
--^V^V^V^---
A magnetic field
Cells can be connected together to make a battery
Symbol

3. What is true about a dry cell?
Amperes
Strength of the charge
Insulation resistance and Dielectric strength(Both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)

4. What is the basic law of magnetic force?
Circular and square mills(Both A and B)
--^V^V^V^---
The direction of the magnetic field
Unlike poles attract

5. Which material has the lowest resistance at ordinary temperatures?
Silver
20%
Cables
Plastic - Rubber - Friction(all of the above)

6. What type of circuit has one path of follow through a load?
Series circuit
50 Ohms
Heat
Heat

7. What does static electricity do?
Start with the band on the end and read to the center
By their covering
Does not move
Voltage

8. What is the measure of potential difference?
Volts
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
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)
By their covering

9. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Symbol
10%
Heat and current control(both a and c)
50 Ohms

10. What is resistance in electrical terms?
Opposition to electrical current
12 volts
Cables
Electromagnetic field

11. To what measurement do the conductor mills refer?
20%
Potential difference
Insulation resistance
1/1000th of an inch

12. What are the two generic methods to eliminate static electricity from metal objects?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Composition of the resistor
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)
Bonding and grounding

13. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Grounding wire
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

14. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
50 Ohms
Electrical resistance against the flow of current
By their covering

15. What is the term for two or more cells attached together?
Use an effect to produce another effect
Symbol
From the negative battery terminal to the positive terminal
Battery

16. What is another name for an inductor?
Heat
Choke
Chemical action
Energy

17. What type of circuit has two or more paths for current to follow?
Electromagnetic field
Unlike poles attract
Fixed - Electrolytic - Variable(all of the above)
Parallel circuit

18. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Fixed - Electrolytic - Variable(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Parallel
Resistance increases as the conductor length increases

19. When reading resistance color codes - what does the fourth band indicate?
Tolerence
American wire gauge(AWG)
Volts
Purging

20. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Stores electrical charge
American wire gauge(AWG)
75 Ohms

21. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The direction the negative charge moves
Use an effect to produce another effect

22. What are the names of two of the six primary methods of producing a voltage?
12 volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Cells can be connected together to make a battery
A difference in potential energy

23. What must be large enough to carry the largest current likely to occur?
A difference in potential energy
5%
Grounding wire
Gauge number

24. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Bonding and grounding
DC current
Symbol

25. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
15 -000 ohms - 20%
Electrical resistance against the flow of current
High resistance

26. Identify the blueprint symbol for resistors.
Heat and current control(both a and c)
10
--^V^V^V^---
Potential difference

27. What can permanently break down a capacitor?
The direction of the magnetic field
15 -000 ohms - 20%
Breakdown voltage
Ohms

28. What is a wire classification?
Resistance value can not be changed
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)
Bare - covered - insulated - stranded - cable(All of the above)
The relationship of potential difference to current

29. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Start with the band on the end and read to the center
Current change in a coil creates a magnetic change
The direction of the magnetic field

30. What does Ohm's Law represent?
Magnetic properties
Plastic - Rubber - Friction(all of the above)
Relationship between current and potential difference
Gauge number

31. What is a type of capacitor?
First digit
Potential difference
Mutual induction
Fixed - Electrolytic - Variable(all of the above)

32. What does a transformer transform?
The direction of the magnetic field
Mutual induction
The relationship of potential difference to current
Ability to store an electric charge

33. What does a moving charge produce?
Electrical resistance against the flow of current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A magnetic field
Solenoid and Relay(both A and B)

34. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Relay
Purging
How much potential difference can a material withstand before breaking down

35. What is a characteristic of a fixed resistor?
Gauge number
Fixed - Electrolytic - Variable(all of the above)
Opposition to electrical current
Resistance value can not be changed

36. What does resistance produce?
Alternating current
15 -000 ohms - 20%
The direction of the magnetic field
Heat

37. What is an arrangement of materials that create a potential difference by chemistry?
Opposes any change in the current flowing in a circuit
Mutual induction
How much potential difference can a material withstand before breaking down
Cell

38. In most applications - what remains constant if the current remains constant and flows in one direction?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetic field
Stranded
The direction the negative charge moves

39. What do electrical charges need to cause a fire or explosion?
Tolerence
Heat and current control(both a and c)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

40. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Cell
Fixed - Electrolytic - Variable(all of the above)
The rate of doing work

41. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Grounding wire
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
75 Ohms

42. What determines the resistance of a resistor?
Composition of the resistor
Relationship between current and potential difference
Electrical resistance against the flow of current
Mutual induction

43. What do transducers do in electrical terms?
Does not move
Solenoid and Relay(both A and B)
Cells can be connected together to make a battery
Use an effect to produce another effect

44. What is insulation resistance?
Current change in a coil creates a magnetic change
Plastic - Rubber - Friction(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Electrical resistance against the flow of current

45. What is the purpose of capacitors in electrical circuits?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Does not move
First digit is 9
Stores electrical charge

46. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
10
Secondary cell

47. What is the term for doing work at the rate of joule per second?
--^V^V^V^---
10
Choke
1 watt

48. What is an electromagnet?
Moving vehicles
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Symbol
10%

49. 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
American wire gauge(AWG)
Resistance value can not be changed
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
12 volts

50. Where do the fingers point in both Left-Hand Rules?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The direction of the magnetic field
Produce heat - light - or limit current to control it(all of the above)