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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?
Relationship between current and potential difference
Potential difference
1/1000th of an inch
DC flows continuously in one direction and AC potential difference and current both change direction

2. What does an object have if a magnetic field acts on it?
Potential difference
The direction the negative charge moves
Choke
Magnetic properties

3. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Serial
Voltage
Potential difference - E*I - current times current change from point to point(all of the above)
20%

4. What does a third band of brown mean?
From the negative battery terminal to the positive terminal
Serial
Heat
10

5. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Moving vehicles
The direction the negative charge moves
Ability to store an electric charge
5%

6. When reading resistance color codes - what does the first band indicate?
Cells can be connected together to make a battery
First digit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

7. What is a characteristic of insulators?
1 watt
Stranded
15 -000 ohms - 20%
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

8. What is another name for an inductor?
Voltage
Choke
Magnetic properties
Wire splices

9. What is insulation resistance?
50 Ohms
Heat
Electrical resistance against the flow of current
Unlike poles attract

10. What is a type of mechanical transducer?
Produce heat - light - or limit current to control it(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Solenoid and Relay(both A and B)
The relationship of potential difference to current

11. When does a DC circuit oppose current flow?
1 watt
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Voltmeter
Gauge number

12. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
5%
Magnetic properties
Alternating current
Mutual induction

13. What is a common measure of wire diameter?
75 Ohms
Gauge number
Potential difference
Chemical action

14. What is a characteristic of a fixed resistor?
Resistance value can not be changed
15 -000 ohms - 20%
Heat
Strength of the charge

15. What do transducers do in electrical terms?
How much potential difference can a material withstand before breaking down
12 volts
Use an effect to produce another effect
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)

16. What information do the Left-Hand Rules provide?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Battery
The direction the negative charge moves

17. What does a moving charge produce?
Heat and current control(both a and c)
Cells can be connected together to make a battery
Electromagnetic field
A magnetic field

18. What results when current is run through a material with high resistance?
75 Ohms
Stores electrical charge
Heat and current control(both a and c)
Common - not rechargable - gradually discharges when in storage(All of the above)

19. What is the term for doing work at the rate of joule per second?
Bonding and grounding
From the negative battery terminal to the positive terminal
Use an effect to produce another effect
1 watt

20. How do static charges distribute themselves?
DC current
Volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
75 Ohms

21. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
The direction of the magnetic field
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)
Insulation resistance

22. What is the name for electrical resistance of insulation?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat and current control(both a and c)
Start with the band on the end and read to the center
Insulation resistance

23. What is a switch that operates by electricity?
Volts
Relay
Purging
10%

24. How do you read resistor color codes?
High resistance
10
Start with the band on the end and read to the center
1/1000th of an inch

25. What is needed for electric heating elements and the filaments of light bulbs?
Heat and current control(both a and c)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Grounding wire
High resistance

26. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
DC current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Serial
The relationship of potential difference to current

27. What is a DC circuit characteristic?
The relationship of potential difference to current
Current flows in one direction - potential differences across a load does not change(Both A and B)
10%
Cell

28. What is dielectric strength?
Serial
Breakdown voltage
The direction of the magnetic field
How much potential difference can a material withstand before breaking down

29. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Purging
Potential difference - E*I - current times current change from point to point(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

30. To what measurement do the conductor mills refer?
12 volts
1/1000th of an inch
First digit is 9
Plastic - Rubber - Friction(all of the above)

31. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Relay
Heat and current control(both a and c)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
50 Ohms

32. What is capacitance in electrical terms?
Porcelain
Moving vehicles
Cell
Ability to store an electric charge

33. What makes electrons flow?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Potential difference
Composition of the resistor

34. 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
Stranded
Opposition to movement of free electrons
12 volts
Symbol

35. What is the unit of measurement of potential difference?
Serial
Current change in a coil creates a magnetic change
Symbol
Volts

36. What is resistance in electrical terms?
Mutual induction
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)
Opposition to electrical current

37. What is an electromagnet?
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)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

38. Which of the following is a type of resistor?
Parallel
Heat
Fixed - tapped - variable(all of the above)
1/1000th of an inch

39. The thermocouple uses which method for creating potential energy?
First digit
Opposes any change in the current flowing in a circuit
Ability to store an electric charge
Heat

40. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Parallel circuit
Ohms
DC flows continuously in one direction and AC potential difference and current both change direction

41. What do we call the ability to do work?
DC current
10
12 volts
Energy

42. What wire measurement is commonly used in the U.S.?
Cells can be connected together to make a battery
Current change in a coil creates a magnetic change
American wire gauge(AWG)
Grounding wire

43. Which of the following materials is NOT a good conductor?
Porcelain
Chemical action
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)
Start with the band on the end and read to the center

44. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Opposition to electrical current
Potential difference
Fixed - tapped - variable(all of the above)

45. What do electrical charges need to cause a fire or explosion?
Wire splices
Insulation resistance and Dielectric strength(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Insulation resistance

46. What does a first band of white mean?
First digit is 9
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Moving vehicles
Serial

47. What types of protective tapes are used?
Ability to store an electric charge
1 watt
Tolerence
Plastic - Rubber - Friction(all of the above)

48. Which type of cell can be recharged?
Porcelain
15 -000 ohms - 20%
Secondary cell
50 Ohms

49. What type of circuit has two or more paths for current to follow?
Symbol
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Start with the band on the end and read to the center
Parallel circuit

50. What is a common form used in conductors?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Cables
The relationship of potential difference to current
Potential difference