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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. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Does not move
DC flows continuously in one direction and AC potential difference and current both change direction
Wire splices

2. What is the purpose of capacitors in electrical circuits?
Common - not rechargable - gradually discharges when in storage(All of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
--^V^V^V^---
Stores electrical charge

3. What wire measurement is commonly used in the U.S.?
Symbol
American wire gauge(AWG)
Gauge number
How much potential difference can a material withstand before breaking down

4. What are the common units of measurement for round and square conductor cross - sections?
Bonding and grounding
Use an effect to produce another effect
Circular and square mills(Both A and B)
DC current

5. What is voltage?
Resistance increases as the conductor length increases
Start with the band on the end and read to the center
A difference in potential energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

6. What does Ohm's Law represent?
Silver
Start with the band on the end and read to the center
Relationship between current and potential difference
20%

7. What does a first band of white mean?
The direction of the magnetic field
How much potential difference can a material withstand before breaking down
First digit is 9
Ohms

8. What does an object have if a magnetic field acts on it?
By their covering
Potential difference
Porcelain
Magnetic properties

9. What makes electrons flow?
Start with the band on the end and read to the center
Potential difference
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)

10. Why is the transformer important to AC electricity?

11. What is a DC circuit characteristic?
The direction of the magnetic field
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol

12. What is dielectric strength?
Produce heat - light - or limit current to control it(all of the above)
How much potential difference can a material withstand before breaking down
Amperes
Ohms

13. What is a type of mechanical transducer?
Parallel
Amperes
Solenoid and Relay(both A and B)
First digit

14. What is a characteristic of a fixed resistor?
Gauge number
Electromagnetism
75 Ohms
Resistance value can not be changed

15. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Wire splices
50 Ohms
Chemical action
Gauge number

16. How do you read resistor color codes?
Start with the band on the end and read to the center
A difference in potential energy
Potential difference
50 Ohms

17. What is an electromagnet?
Opposition to movement of free electrons
By their covering
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Purging

18. What makes electrons flow?
How much potential difference can a material withstand before breaking down
Does not move
Use an effect to produce another effect
Potential difference

19. A resistor is color coded brown - green - orange. What is its resistance?
The direction the negative charge moves
Mutual induction
15 -000 ohms - 20%
Wire splices

20. The generator is what method of creating potential energy?
Parallel
Electromagnetism
Mutual induction
Series circuit

21. What is a conductor?
Voltmeter
A difference in potential energy
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

22. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Potential difference
Grounding wire

23. What is the measure of potential difference?
Opposition to electrical current
Composition of the resistor
Volts
From the negative battery terminal to the positive terminal

24. What do junction boxes protect?
Bonding and grounding
Volts
Wire splices
High resistance

25. The thermocouple uses which method for creating potential energy?
First digit
Heat
Magnetic properties
Bonding and grounding

26. What is the relationship between magnetism and electricity?
Does not move
--^V^V^V^---
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)
Series circuit

27. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Heat
Electromagnetic field
Unlike poles attract

28. Where does the thumb point in both Left-Hand Rules?
Fixed - tapped - variable(all of the above)
The direction the negative charge moves
Parallel circuit
--^V^V^V^---

29. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Unlike poles attract
Voltage
American wire gauge(AWG)
Solenoid and Relay(both A and B)

30. Which type of cell can be recharged?
Magnetic properties
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance
Secondary cell

31. How many kinds of poles do magnets have?
Ohms
Solenoid and Relay(both A and B)
Two
Amperes

32. What type of circuit has one path of follow through a load?
Series circuit
Heat
American wire gauge(AWG)
First digit

33. How is capacitance determined?
Symbol
Wire splices
Area and spacing of capacitor - static current in the capacitor(both A and B)
First digit is 9

34. Identify the blueprint symbol for capacitors.
DC flows continuously in one direction and AC potential difference and current both change direction
20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Symbol

35. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
From the negative battery terminal to the positive terminal
Current change in a coil creates a magnetic change

36. What instrument measures voltage?
Secondary cell
Potential difference
Voltmeter
Porcelain

37. What must be large enough to carry the largest current likely to occur?
Energy
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Grounding wire
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

38. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Electromagnetic field
75 Ohms

39. Identify the blueprint symbol for resistors.
Potential difference
Wire splices
--^V^V^V^---
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

40. What is the term for two or more cells attached together?
Cell
Battery
10
10%

41. 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
Potential difference
Ability to store an electric charge
50 Ohms
75 Ohms

42. To what measurement do the conductor mills refer?
1/1000th of an inch
Opposition to electrical current
Insulation resistance
Symbol

43. What does a third band of brown mean?
Gauge number
Produce heat - light - or limit current to control it(all of the above)
Heat
10

44. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Gauge number
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Silver

45. What type of circuit has two or more paths for current to follow?
Ability to store an electric charge
A magnetic field
Parallel circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

46. Which material has the lowest resistance at ordinary temperatures?
10
Silver
Ohms
Opposition to electrical current

47. What is the purpose of resistors in electrical circuits?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
5%
Produce heat - light - or limit current to control it(all of the above)
Chemical action

48. How do static charges distribute themselves?
DC flows continuously in one direction and AC potential difference and current both change direction
Stores electrical charge
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

49. What does a transformer transform?
Circular and square mills(Both A and B)
The relationship of potential difference to current
By their covering
Insulation resistance

50. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Grounding wire
By their covering
Heat and current control(both a and c)
Parallel