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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
Plastic - Rubber - Friction(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Battery

2. 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
Battery
10
Relay
12 volts

3. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Volts
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Voltage
High resistance

4. What is a type of capacitor?
Relationship between current and potential difference
20%
Fixed - Electrolytic - Variable(all of the above)
Solenoid and Relay(both A and B)

5. What is a characteristic of a fixed resistor?
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)
Resistance value can not be changed
Grounding wire

6. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
Strength of the charge
Electromagnetic field

7. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Fixed - Electrolytic - Variable(all of the above)
Volts
Wire splices

8. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
High resistance
Mutual induction
Parallel
Potential difference

9. What makes electrons flow?
Produce heat - light - or limit current to control it(all of the above)
Potential difference
Porcelain
Volts

10. What makes electrons flow?
A difference in potential energy
Volts
Potential difference
Tolerence

11. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposes any change in the current flowing in a circuit
Heat and current control(both a and c)
Alternating current

12. What instrument measures voltage?
Circular and square mills(Both A and B)
Energy
Voltmeter
Electromagnetic field

13. What is an arrangement of materials that create a potential difference by chemistry?
Two
Cell
Voltmeter
Resistance value can not be changed

14. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Voltmeter
15 -000 ohms - 20%
Solenoid and Relay(both A and B)

15. The generator is what method of creating potential energy?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetism
Unlike poles attract
10

16. What is the purpose of resistors in electrical circuits?
Moving vehicles
Produce heat - light - or limit current to control it(all of the above)
Unlike poles attract
Symbol

17. What is the difference between AC and DC?
Bare - covered - insulated - stranded - cable(All of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Wire splices
DC flows continuously in one direction and AC potential difference and current both change direction

18. What do junction boxes protect?
Alternating current
Amperes
Composition of the resistor
Wire splices

19. What are the common units of measurement for round and square conductor cross - sections?
12 volts
Potential difference
Series circuit
Circular and square mills(Both A and B)

20. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Start with the band on the end and read to the center
Amperes
Current flows in one direction - potential differences across a load does not change(Both A and B)

21. What cannot be transformed to higher or lower potential differences?
Symbol
DC current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance increases as the conductor length increases

22. Which of the following materials is NOT a good conductor?
12 volts
Porcelain
Heat
Energy

23. When does a DC circuit oppose current flow?
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)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
12 volts
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

24. Why is the transformer important to AC electricity?

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25. What does an object have if a magnetic field acts on it?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Ability to store an electric charge
Magnetic properties
Strength of the charge

26. Which type of cell can be recharged?
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)
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)
Secondary cell
Parallel

27. When reading resistance color codes - what does the first band indicate?
Ability to store an electric charge
Potential difference
Relay
First digit

28. What is the use of the electromagnet?
5%
Potential difference
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

29. What is an electromagnet?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposes any change in the current flowing in a circuit
Strength of the charge
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

30. What is the purpose of a raceway?
The direction the negative charge moves
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Tolerence
Gauge number

31. What type of circuit has two or more paths for current to follow?
Symbol
Alternating current
Gauge number
Parallel circuit

32. What is the term for two or more cells attached together?
Heat
Series circuit
The relationship of potential difference to current
Battery

33. What results when current is run through a material with high resistance?
High resistance
Serial
Heat and current control(both a and c)
Does not move

34. What is the unit of measurement of electrical current?
Common - not rechargable - gradually discharges when in storage(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)
Amperes
A difference in potential energy

35. What is a DC circuit characteristic?
Plastic - Rubber - Friction(all of the above)
15 -000 ohms - 20%
Parallel circuit
Current flows in one direction - potential differences across a load does not change(Both A and B)

36. What is the fundamental property of insulators?
First digit is 9
Insulation resistance and Dielectric strength(Both A and B)
Composition of the resistor
A magnetic field

37. What is the term for doing work at the rate of joule per second?
1 watt
Cells can be connected together to make a battery
Fixed - tapped - variable(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

38. Identify the general blueprint symbol for inductors.
Symbol
Relay
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)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

39. What is induction?
10%
Current change in a coil creates a magnetic change
Symbol
Stores electrical charge

40. What does a third band of brown mean?
Potential difference
Common - not rechargable - gradually discharges when in storage(All of the above)
10
Heat

41. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
First digit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

42. What is a type of mechanical transducer?
Heat
Gauge number
Solenoid and Relay(both A and B)
Chemical action

43. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
By their covering
First digit is 9
Relationship between current and potential difference

44. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Fixed - Electrolytic - Variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

45. What do transducers do in electrical terms?
Use an effect to produce another effect
First digit is 9
Voltmeter
Ability to store an electric charge

46. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Serial
5%
Insulation resistance and Dielectric strength(Both A and B)
How much potential difference can a material withstand before breaking down

47. What is another name for an inductor?
Does not move
Electrical resistance against the flow of current
Breakdown voltage
Choke

48. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
From the negative battery terminal to the positive terminal
Two
First digit

49. What is a common measure of wire diameter?
Potential difference
Moving vehicles
A difference in potential energy
Gauge number

50. What wire measurement is commonly used in the U.S.?
Unlike poles attract
Area and spacing of capacitor - static current in the capacitor(both A and B)
Magnetic properties
American wire gauge(AWG)