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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 is a DC circuit characteristic?
50 Ohms
Current flows in one direction - potential differences across a load does not change(Both A and B)
20%
Parallel

2. What is needed for electric heating elements and the filaments of light bulbs?
Start with the band on the end and read to the center
Ohms
Voltmeter
High resistance

3. What is voltage?
High resistance
Cables
Symbol
A difference in potential energy

4. Identify the general blueprint symbol for inductors.
Fixed - Electrolytic - Variable(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Symbol
Bare - covered - insulated - stranded - cable(All of the above)

5. What does a moving charge produce?
Does not move
Voltage
Ability to store an electric charge
A magnetic field

6. Which type of cell can be recharged?
Secondary cell
Plastic - Rubber - Friction(all of the above)
Produce heat - light - or limit current to control it(all of the above)
High resistance

7. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Direction of: electric charge - magnetic field - force of the moving charge(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)
Strength of the charge
10%

8. What is the relationship of conductor size and length to resistance?
Stranded
Start with the band on the end and read to the center
Grounding wire
Resistance increases as the conductor length increases

9. How do you read resistor color codes?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
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
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

10. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Volts
20%
Opposition to electrical current
50 Ohms

11. What is a common measure of wire diameter?
How much potential difference can a material withstand before breaking down
Gauge number
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol

12. What is resistance in electrical terms?
Opposition to electrical current
15 -000 ohms - 20%
Ohms
Grounding wire

13. What does Ohm's Law represent?
Relationship between current and potential difference
75 Ohms
Grounding wire
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

14. What is a characteristic of insulators?
Resistance value can not be changed
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Porcelain

15. Why is the transformer important to AC electricity?

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16. What does a third band of brown mean?
How much potential difference can a material withstand before breaking down
Energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10

17. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Bare - covered - insulated - stranded - cable(All of the above)
First digit is 9
Use an effect to produce another effect

18. What cannot be transformed to higher or lower potential differences?
1 watt
DC current
Cables
The direction the negative charge moves

19. What type of circuit has one path of follow through a load?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Chemical action
Potential difference - E*I - current times current change from point to point(all of the above)
Series circuit

20. How do static charges distribute themselves?
20%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Magnetic properties
10%

21. 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
High resistance
Start with the band on the end and read to the center
Potential difference

22. What are the common units of measurement for round and square conductor cross - sections?
Electromagnetism
Circular and square mills(Both A and B)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The rate of doing work

23. What is the relationship between cells and batteries?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cells can be connected together to make a battery
Insulation resistance
--^V^V^V^---

24. What is true about a dry cell?
--^V^V^V^---
Common - not rechargable - gradually discharges when in storage(All of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

25. What type of circuit has two or more paths for current to follow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Secondary cell
Parallel circuit
Ohms

26. The thermocouple uses which method for creating potential energy?
Heat
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
A magnetic field

27. What do transducers do in electrical terms?
Common - not rechargable - gradually discharges when in storage(All of the above)
Use an effect to produce another effect
Volts
Current change in a coil creates a magnetic change

28. What are the names of two of the six primary methods of producing a voltage?
1 watt
Strength of the charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)

29. What determines the resistance of a resistor?
Ability to store an electric charge
Composition of the resistor
Amperes
Insulation resistance and Dielectric strength(Both A and B)

30. What is a characteristic of a fixed resistor?
Resistance value can not be changed
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Potential difference
Volts

31. To what measurement do the conductor mills refer?
1/1000th of an inch
Opposition to movement of free electrons
20%
Produce heat - light - or limit current to control it(all of the above)

32. What does a transformer transform?
Alternating current
The relationship of potential difference to current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Heat and current control(both a and c)

33. What wire measurement is commonly used in the U.S.?
Choke
Serial
American wire gauge(AWG)
Circular and square mills(Both A and B)

34. What instrument measures voltage?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Voltmeter
Unlike poles attract
The relationship of potential difference to current

35. The generator is what method of creating potential energy?
Heat
DC current
Choke
Electromagnetism

36. What do we call the ability to do work?
Ohms
Solenoid and Relay(both A and B)
Energy
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

37. What can permanently break down a capacitor?
12 volts
A magnetic field
Cells can be connected together to make a battery
Breakdown voltage

38. What is dielectric strength?
Alternating current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Parallel
How much potential difference can a material withstand before breaking down

39. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Opposition to movement of free electrons
Porcelain
Voltmeter

40. Which way is the current going in the circuit shown?(electron flow)
Battery
Opposes any change in the current flowing in a circuit
From the negative battery terminal to the positive terminal
Potential difference

41. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
The direction of the magnetic field
10%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

42. What is the relationship between magnetism and electricity?
By their covering
Parallel
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)
Relay

43. What is capacitance in electrical terms?
Ability to store an electric charge
Electromagnetism
Volts
How much potential difference can a material withstand before breaking down

44. What does resistance produce?
5%
50 Ohms
1/1000th of an inch
Heat

45. Identify the blueprint symbol for resistors.
Does not move
--^V^V^V^---
Circular and square mills(Both A and B)
12 volts

46. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke
1/1000th of an inch
1 watt

47. How is capacitance determined?
The direction the negative charge moves
Area and spacing of capacitor - static current in the capacitor(both A and B)
Potential difference
Wire splices

48. What is the unit of measurement of electrical current?
Electrical resistance against the flow of current
Mutual induction
Bonding and grounding
Amperes

49. What is a way to classify wires and cables?
By their covering
The direction the negative charge moves
Grounding wire
Insulation resistance and Dielectric strength(Both A and B)

50. What is power?
Produce heat - light - or limit current to control it(all of the above)
Grounding wire
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
The rate of doing work