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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 the unit of measurement of electrical current?
Amperes
Moving vehicles
By their covering
Opposition to electrical current

2. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Electrical resistance against the flow of current
By their covering
5%
Energy

3. What makes electrons flow?
Potential difference
Grounding wire
Alternating current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

4. What is the fundamental property of insulators?
10
Insulation resistance and Dielectric strength(Both A and B)
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

5. What is the use of the electromagnet?
Plastic - Rubber - Friction(all of the above)
10
Insulation resistance and Dielectric strength(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

6. What is power?
Purging
Stranded
Fixed - Electrolytic - Variable(all of the above)
The rate of doing work

7. What is induction?
Current change in a coil creates a magnetic change
Plastic - Rubber - Friction(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
The relationship of potential difference to current

8. What makes electrons flow?
Breakdown voltage
Potential difference
Gauge number
Current change in a coil creates a magnetic change

9. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Unlike poles attract
Resistance value can not be changed
Plastic - Rubber - Friction(all of the above)

10. What do electrical charges need to cause a fire or explosion?
50 Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(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)
20%

11. 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
15 -000 ohms - 20%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Magnetic properties
75 Ohms

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

13. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Breakdown voltage
Heat
Tolerence

14. What do transducers do in electrical terms?
Use an effect to produce another effect
Serial
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A magnetic field

15. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Secondary cell
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Does not move

16. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Volts
Gauge number
Alternating current

17. How do you read resistor color codes?
Resistance increases as the conductor length increases
Start with the band on the end and read to the center
Fixed - tapped - variable(all of the above)
Relay

18. What is the unit of measurement of potential difference?
Volts
High resistance
Energy
Current flows in one direction - potential differences across a load does not change(Both A and B)

19. Identify the general blueprint symbol for inductors.
High resistance
Symbol
Gauge number
From the negative battery terminal to the positive terminal

20. What is a type of capacitor?
Insulation resistance
50 Ohms
Fixed - Electrolytic - Variable(all of the above)
Amperes

21. What is a common measure of wire diameter?
Grounding wire
Tolerence
Heat
Gauge number

22. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Cells can be connected together to make a battery
Symbol
Energy
20%

23. Which material has the lowest resistance at ordinary temperatures?
Heat and current control(both a and c)
10
Purging
Silver

24. What does static electricity do?
Breakdown voltage
DC flows continuously in one direction and AC potential difference and current both change direction
1 watt
Does not move

25. Where does the thumb point in both Left-Hand Rules?
First digit
Symbol
Parallel circuit
The direction the negative charge moves

26. Which of the following is a type of resistor?
Electrical resistance against the flow of current
Bare - covered - insulated - stranded - cable(All of the above)
Mutual induction
Fixed - tapped - variable(all of the above)

27. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Secondary cell
Voltage
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC current

28. What results when current is run through a material with high resistance?
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
Heat and current control(both a and c)
Solenoid and Relay(both A and B)

29. What type of circuit has one path of follow through a load?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to electrical current
Series circuit
Silver

30. What does a moving charge produce?
10%
Volts
A magnetic field
--^V^V^V^---

31. Which way is the current going in the circuit shown?(electron flow)
Secondary cell
From the negative battery terminal to the positive terminal
Energy
Ability to store an electric charge

32. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Fixed - tapped - variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy

33. Why is the transformer important to AC electricity?

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34. The thermocouple uses which method for creating potential energy?
Gauge number
Heat
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
20%

35. What is the relationship between cells and batteries?
Tolerence
Start with the band on the end and read to the center
Opposition to electrical current
Cells can be connected together to make a battery

36. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Grounding wire
Current change in a coil creates a magnetic change
20%

37. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Magnetic properties
Purging
50 Ohms
Choke

38. What is the measure of potential difference?
Heat
Solenoid and Relay(both A and B)
A magnetic field
Volts

39. What is the term for two or more cells attached together?
Battery
--^V^V^V^---
Fixed - Electrolytic - Variable(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)

40. What can permanently break down a capacitor?
Breakdown voltage
Voltage
Alternating current
Ability to store an electric charge

41. What do junction boxes protect?
The direction of the magnetic field
Volts
Wire splices
The relationship of potential difference to current

42. What is the type of cable composed of many fine wires?
Stranded
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Electromagnetism

43. What does an object have if a magnetic field acts on it?
Relay
Voltmeter
Magnetic properties
Alternating current

44. How is the heat production measured in a resistor?
Common - not rechargable - gradually discharges when in storage(All of the above)
A difference in potential energy
Potential difference - E*I - current times current change from point to point(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

45. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
1/1000th of an inch
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Serial
From the negative battery terminal to the positive terminal

46. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
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
50 Ohms
Area and spacing of capacitor - static current in the capacitor(both A and B)

47. What is the term for doing work at the rate of joule per second?
1 watt
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 and Dielectric strength(Both A and B)
Resistance increases as the conductor length increases

48. What must be large enough to carry the largest current likely to occur?
By their covering
Secondary cell
Grounding wire
Heat

49. What is a common cause of static electricity in a shop?
Moving vehicles
Composition of the resistor
Alternating current
Insulation resistance and Dielectric strength(Both A and B)

50. What type of circuit has two or more paths for current to follow?
Purging
Parallel circuit
Heat
Relationship between current and potential difference