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Test your basic knowledge |

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
Relay
Solenoid and Relay(both A and B)
Secondary cell

2. What is a switch that operates by electricity?
Relay
Resistance value can not be changed
Tolerence
Wire splices

3. What is the difference between AC and DC?
Composition of the resistor
DC flows continuously in one direction and AC potential difference and current both change direction
Wire splices
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

4. What is the basic law of magnetic force?
Mutual induction
5%
Unlike poles attract
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

5. Which type of cell can be recharged?
Secondary cell
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
15 -000 ohms - 20%
Volts

6. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Grounding wire
Bonding and grounding
Alternating current
Voltmeter

7. What is the relationship between magnetism and electricity?
Silver
Plastic - Rubber - Friction(all of the above)
12 volts
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)

8. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to electrical current
Serial
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)

9. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Tolerence
Produce heat - light - or limit current to control it(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Purging

10. What is a common cause of static electricity in a shop?
Insulation resistance
Composition of the resistor
Moving vehicles
Volts

11. The dry cell is what method for creating potential energy?
How much potential difference can a material withstand before breaking down
Alternating current
A magnetic field
Chemical action

12. The thermocouple uses which method for creating potential energy?
Heat
Use an effect to produce another effect
Insulation 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)

13. What is the unit of measurement of resistance?
The rate of doing work
Insulation resistance
Voltmeter
Ohms

14. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Alternating current
5%
Opposition to electrical current

15. 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)
Opposition to electrical current
Purging
Stranded

16. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Voltage
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Potential difference

17. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Battery
Heat
Fixed - tapped - variable(all of the above)

18. What is the unit of measurement of electrical current?
By their covering
Bare - covered - insulated - stranded - cable(All of the above)
1/1000th of an inch
Amperes

19. What is a common measure of wire diameter?
Ohms
Bare - covered - insulated - stranded - cable(All of the above)
Gauge number
A magnetic field

20. What type of circuit has one path of follow through a load?
Series circuit
Symbol
Cables
Heat

21. What do electrical charges need to cause a fire or explosion?
The direction the negative charge moves
Electrical resistance against the flow of current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Grounding wire

22. What does resistance produce?
Strength of the charge
Volts
Heat
10

23. What is the relationship of conductor size and length to resistance?
Electromagnetic field
Resistance increases as the conductor length increases
Voltage
Current flows in one direction - potential differences across a load does not change(Both A and B)

24. What is the term for two or more cells attached together?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Gauge number
Tolerence
Battery

25. What is a characteristic of a fixed resistor?
Opposition to movement of free electrons
Resistance value can not be changed
Relay
From the negative battery terminal to the positive terminal

26. What is a conductor?
75 Ohms
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy
Stranded

27. The generator is what method of creating potential energy?
Stranded
Tolerence
Electromagnetism
Breakdown voltage

28. What makes electrons flow?
Silver
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Potential difference
Ability to store an electric charge

29. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
20%
By their covering
The direction of the magnetic field
Mutual induction

30. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Battery
High resistance
Plastic - Rubber - Friction(all of the above)

31. What does a transformer transform?
Symbol
Cables
The relationship of potential difference to current
By their covering

32. What types of protective tapes are used?
DC flows continuously in one direction and AC potential difference and current both change direction
Plastic - Rubber - Friction(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms

33. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Voltmeter
From the negative battery terminal to the positive terminal
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)

34. What do transducers do in electrical terms?
5%
Relay
Use an effect to produce another effect
Wire splices

35. What is a way to classify wires and cables?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10
Secondary cell
By their covering

36. Why is the transformer important to AC electricity?

37. What is an electromagnet?
20%
By their covering
1/1000th of an inch
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

38. What does an object have if a magnetic field acts on it?
Magnetic properties
Symbol
Parallel
Symbol

39. What is the use of the electromagnet?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Fixed - tapped - variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
First digit is 9

40. Identify the blueprint symbol for resistors.
Silver
Symbol
Current flows in one direction - potential differences across a load does not change(Both A and B)
--^V^V^V^---

41. 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
The rate of doing work
1 watt
Insulation resistance and Dielectric strength(Both A and B)
12 volts

42. 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
Opposes any change in the current flowing in a circuit
Solenoid and Relay(both A and B)
Silver

43. What is another name for an inductor?
Electrical resistance against the flow of current
Choke
The rate of doing work
Plastic - Rubber - Friction(all of the above)

44. What does a first band of white mean?
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed
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)
First digit is 9

45. When reading resistance color codes - what does the first band indicate?
75 Ohms
Tolerence
Plastic - Rubber - Friction(all of the above)
First digit

46. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Magnetic properties
Purging
5%
Opposition to movement of free electrons

47. What is the type of cable composed of many fine wires?
--^V^V^V^---
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
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

48. What do we call the ability to do work?
Energy
Solenoid and Relay(both A and B)
Parallel
Current change in a coil creates a magnetic change

49. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Cell
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)
A magnetic field
Voltage

50. What is insulation resistance?
Volts
Moving vehicles
Secondary cell
Electrical resistance against the flow of current