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Test your basic knowledge |
Basic Electricity
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Subject
:
engineering
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 makes electrons flow?
Potential difference
Circular and square mills(Both A and B)
Cells can be connected together to make a battery
Composition of the resistor
2. What is dielectric strength?
By their covering
A difference in potential energy
How much potential difference can a material withstand before breaking down
Area and spacing of capacitor - static current in the capacitor(both A and B)
3. What is the purpose of capacitors in electrical circuits?
Porcelain
Plastic - Rubber - Friction(all of the above)
Stores electrical charge
Wire splices
4. What is another name for an inductor?
Common - not rechargable - gradually discharges when in storage(All of the above)
Choke
Start with the band on the end and read to the center
Fixed - Electrolytic - Variable(all of the above)
5. What is the unit of measurement of resistance?
Ability to store an electric charge
Unlike poles attract
Produce heat - light - or limit current to control it(all of the above)
Ohms
6. What do transducers do in electrical terms?
Use an effect to produce another effect
10%
Resistance increases as the conductor length increases
Parallel circuit
7. What is a way to classify wires and cables?
By their covering
Stranded
Amperes
Use an effect to produce another effect
8. What is the measure of potential difference?
Volts
High resistance
By their covering
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
9. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Voltmeter
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
The direction the negative charge moves
Parallel
10. How do you read resistor color codes?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Start with the band on the end and read to the center
Secondary cell
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)
11. The thermocouple uses which method for creating potential energy?
Relationship between current and potential difference
The rate of doing work
Heat
Bare - covered - insulated - stranded - cable(All of the above)
12. What determines whether a spark can be produced?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Strength of the charge
Ohms
Grounding wire
13. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Unlike poles attract
Heat
Chemical action
14. What is the type of cable composed of many fine wires?
Parallel circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Stranded
Resistance increases as the conductor length increases
15. What is the purpose of a raceway?
The direction the negative charge moves
Cells can be connected together to make a battery
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Start with the band on the end and read to the center
16. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Current change in a coil creates a magnetic change
Potential difference
75 Ohms
17. What do electrical charges need to cause a fire or explosion?
Series circuit
By their covering
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
18. What is resistance in electrical terms?
10%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Serial
Opposition to electrical current
19. Why is the transformer important to AC electricity?
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)
Resistance increases as the conductor length increases
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cables
20. What is a type of capacitor?
Symbol
Circular and square mills(Both A and B)
Heat
Fixed - Electrolytic - Variable(all of the above)
21. What is power?
Resistance value can not be changed
First digit
The rate of doing work
Solenoid and Relay(both A and B)
22. What type of circuit has two or more paths for current to follow?
Heat and current control(both a and c)
Parallel circuit
Voltmeter
Stranded
23. What information do the Left-Hand Rules provide?
Voltmeter
Resistance value can not be changed
Cell
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
24. What does a third band of brown mean?
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)
10
Bare - covered - insulated - stranded - cable(All of the above)
The relationship of potential difference to current
25. To what measurement do the conductor mills refer?
1/1000th of an inch
Plastic - Rubber - Friction(all of the above)
By their covering
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
26. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Composition of the resistor
The direction of the magnetic field
Serial
27. What must be large enough to carry the largest current likely to occur?
Cables
Grounding wire
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
First digit
28. Which material has the lowest resistance at ordinary temperatures?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
Silver
Breakdown voltage
29. How is capacitance determined?
Secondary cell
Area and spacing of capacitor - static current in the capacitor(both A and B)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
First digit is 9
30. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Electrical resistance against the flow of current
American wire gauge(AWG)
Cables
31. What is the relationship of conductor size and length to resistance?
Electromagnetism
Insulation resistance
Resistance increases as the conductor length increases
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
32. What do junction boxes protect?
Relay
Wire splices
Series circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
33. What is an arrangement of materials that create a potential difference by chemistry?
Serial
Choke
Bare - covered - insulated - stranded - cable(All of the above)
Cell
34. What is the term for two or more cells attached together?
Resistance value can not be changed
Current change in a coil creates a magnetic change
Battery
Electromagnetic field
35. What is voltage?
Amperes
A difference in potential energy
Energy
Resistance increases as the conductor length increases
36. What is true about a dry cell?
Wire splices
Moving vehicles
First digit
Common - not rechargable - gradually discharges when in storage(All of the above)
37. Which of the following materials is NOT a good conductor?
Insulation resistance and Dielectric strength(Both A and B)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Porcelain
A difference in potential energy
38. 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
Energy
75 Ohms
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Moving vehicles
39. What does resistance produce?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
By their covering
Heat
12 volts
40. What is a property of inductors in electrical circuits?
Stores electrical charge
Electromagnetism
Opposes any change in the current flowing in a circuit
From the negative battery terminal to the positive terminal
41. What is the relationship between magnetism and electricity?
Area and spacing of capacitor - static current in the capacitor(both A and B)
15 -000 ohms - 20%
Composition of the resistor
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)
42. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Secondary cell
Stores electrical charge
Composition of the resistor
43. What is a conductor?
Chemical action
Fixed - tapped - variable(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
44. What do we call the ability to do work?
Alternating current
Energy
Voltage
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
45. What instrument measures voltage?
Current change in a coil creates a magnetic change
Heat
Voltmeter
Parallel
46. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
The relationship of potential difference to current
Potential difference
By their covering
47. What types of protective tapes are used?
Does not move
Use an effect to produce another effect
The direction of the magnetic field
Plastic - Rubber - Friction(all of the above)
48. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Heat
Voltage
10
Breakdown voltage
49. Identify the blueprint symbol for capacitors.
Resistance value can not be changed
Opposes any change in the current flowing in a circuit
Symbol
75 Ohms
50. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Electrical resistance against the flow of current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Does not move
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