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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. Identify the blueprint symbol for capacitors.
Electrical resistance against the flow of current
Common - not rechargable - gradually discharges when in storage(All of the above)
The relationship of potential difference to current
Symbol

2. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Amperes
10
75 Ohms
Mutual induction

3. What is the unit of measurement of resistance?
Ohms
Secondary cell
Circular and square mills(Both A and B)
1/1000th of an inch

4. What is a common measure of wire diameter?
Gauge number
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)
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)
Electrical resistance against the flow of current

5. What does a first band of white mean?
Volts
Gauge number
First digit is 9
Breakdown voltage

6. What is the name for electrical resistance of insulation?
Insulation resistance
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Does not move
1/1000th of an inch

7. What is a way to classify wires and cables?
Ohms
Start with the band on the end and read to the center
1/1000th of an inch
By their covering

8. What is a type of mechanical transducer?
Two
A difference in potential energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Solenoid and Relay(both A and B)

9. What is resistance?
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons
Two
Energy

10. To what measurement do the conductor mills refer?
1/1000th of an inch
Silver
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Amperes

11. 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)
Magnetic properties
Bonding and grounding
Tolerence

12. What do junction boxes protect?
Tolerence
Does not move
Series circuit
Wire splices

13. 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
Series circuit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
75 Ohms
The direction the negative charge moves

14. What is the relationship between magnetism and electricity?
50 Ohms
Current change in a coil creates a magnetic change
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)
Solenoid and Relay(both A and B)

15. What instrument measures voltage?
First digit
Alternating current
Voltmeter
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

16. What does a transformer transform?
The relationship of potential difference to 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)
Ohms
Tolerence

17. What type of circuit has two or more paths for current to follow?
5%
The relationship of potential difference to current
Insulation resistance
Parallel circuit

18. How is capacitance determined?
Alternating current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
75 Ohms
Area and spacing of capacitor - static current in the capacitor(both A and B)

19. What is induction?
10
Current change in a coil creates a magnetic change
1/1000th of an inch
Voltage

20. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Tolerence
Electromagnetic field
Voltage
Produce heat - light - or limit current to control it(all of the above)

21. What is the term for doing work at the rate of joule per second?
Opposes any change in the current flowing in a circuit
12 volts
Silver
1 watt

22. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Relationship between current and potential difference
First digit
Volts

23. What is a common form used in conductors?
Cables
Area and spacing of capacitor - static current in the capacitor(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)
Solenoid and Relay(both A and B)

24. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
1 watt
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Magnetic properties

25. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Relationship between current and potential difference
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

26. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Purging
Cells can be connected together to make a battery
American wire gauge(AWG)

27. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Stranded
High resistance
Mutual induction

28. What is an electromagnet?
Tolerence
Porcelain
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposition to movement of free electrons

29. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
A magnetic field
Symbol
Insulation resistance

30. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Porcelain
Energy

31. What is voltage?
Two
A difference in potential energy
5%
Insulation resistance

32. Where does the thumb point in both Left-Hand Rules?
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction the negative charge moves
Composition of the resistor
Ability to store an electric charge

33. What is a wire classification?
Electrical resistance against the flow of current
The direction of the magnetic field
Bare - covered - insulated - stranded - cable(All of the above)
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)

34. What is the relationship of conductor size and length to resistance?
Alternating current
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)
Resistance increases as the conductor length increases
Electromagnetic field

35. What is the type of cable composed of many fine wires?
How much potential difference can a material withstand before breaking down
Common - not rechargable - gradually discharges when in storage(All of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Stranded

36. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A difference in potential energy
Ohms
Current flows in one direction - potential differences across a load does not change(Both A and B)

37. When does a DC circuit oppose current flow?
Bonding and grounding
Volts
Series circuit
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

38. What determines the resistance of a resistor?
--^V^V^V^---
Composition of the resistor
Relay
Insulation resistance

39. What is power?
12 volts
Start with the band on the end and read to the center
Potential difference
The rate of doing work

40. What is the basic law of magnetic force?
Fixed - tapped - variable(all of the above)
Plastic - Rubber - Friction(all of the above)
Two
Unlike poles attract

41. Which material has the lowest resistance at ordinary temperatures?
10
Silver
Tolerence
Unlike poles attract

42. Which type of cell can be recharged?
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)
Stranded
Secondary cell

43. What is capacitance in electrical terms?
Produce heat - light - or limit current to control it(all of the above)
Ability to store an electric charge
Strength of the charge
Use an effect to produce another effect

44. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
A difference in potential energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10%

45. What do we call the ability to do work?
Amperes
Energy
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
20%

46. What is another name for an inductor?
Stranded
Choke
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)

47. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Produce heat - light - or limit current to control it(all of the above)
Parallel
Opposition to movement of free electrons
10%

48. What is a switch that operates by electricity?
1 watt
Current flows in one direction - potential differences across a load does not change(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relay

49. What does Ohm's Law represent?
50 Ohms
5%
Relationship between current and potential difference
Opposes any change in the current flowing in a circuit

50. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Purging
Grounding wire
Series circuit