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 must be large enough to carry the largest current likely to occur?
Solenoid and Relay(both A and B)
Relay
Grounding wire
Insulation resistance

2. What does static electricity do?
Relay
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Does not move
Parallel

3. Identify the general blueprint symbol for inductors.
Stores electrical charge
Symbol
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Volts

4. What is a characteristic of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Voltmeter
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

5. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Composition of the resistor
20%
Electrical resistance against the flow of current

6. To what measurement do the conductor mills refer?
1/1000th of an inch
Fixed - Electrolytic - Variable(all of the above)
Tolerence
Plastic - Rubber - Friction(all of the above)

7. What determines whether a spark can be produced?
Magnetic properties
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)
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

8. Which of the following materials is NOT a good conductor?
Stranded
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Porcelain
10%

9. What is the difference between AC and DC?
A difference in potential energy
Solenoid and Relay(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction
Gauge number

10. What is the relationship between cells and batteries?
Potential difference - E*I - current times current change from point to point(all of the above)
Cells can be connected together to make a battery
Serial
Unlike poles attract

11. How is capacitance determined?
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)
10%
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

12. What is the unit of measurement of potential difference?
DC flows continuously in one direction and AC potential difference and current both change direction
Volts
Fixed - tapped - variable(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

13. What does a transformer transform?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
First digit
Cells can be connected together to make a battery
The relationship of potential difference to current

14. What is a switch that operates by electricity?
Parallel circuit
Electrical resistance against the flow of current
Relay
First digit

15. What is capacitance in electrical terms?
The relationship of potential difference to current
Ability to store an electric charge
Voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

16. What is resistance in electrical terms?
Composition of the resistor
Opposition to electrical current
American wire gauge(AWG)
1 watt

17. The dry cell is what method for creating potential energy?
Resistance increases as the conductor length increases
Chemical action
Battery
Mutual induction

18. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat
Plastic - Rubber - Friction(all of the above)

19. What is needed for electric heating elements and the filaments of light bulbs?
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
The relationship of potential difference to current
High resistance

20. What is a conductor?
Cables
1/1000th of an inch
Series circuit
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

21. When reading resistance color codes - what does the fourth band indicate?
50 Ohms
Solenoid and Relay(both A and B)
Tolerence
Does not move

22. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Ohms
Voltage
Relationship between current and potential difference
Common - not rechargable - gradually discharges when in storage(All of the above)

23. What is the purpose of capacitors in electrical circuits?
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)
The direction the negative charge moves
Stores electrical charge
Volts

24. What is an electromagnet?
Parallel circuit
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Start with the band on the end and read to the center
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

25. What is the measure of potential difference?
Heat
Volts
15 -000 ohms - 20%
Serial

26. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
12 volts
Porcelain
Battery

27. Why is the transformer important to AC electricity?

28. What information do the Left-Hand Rules provide?
Fixed - Electrolytic - Variable(all of the above)
Start with the band on the end and read to the center
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

29. 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
20%
Heat
75 Ohms
Stores electrical charge

30. The generator is what method of creating potential energy?
DC current
Stranded
Electromagnetism
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

31. Identify the blueprint symbol for resistors.
--^V^V^V^---
75 Ohms
Circular and square mills(Both A and B)
Heat

32. What is insulation resistance?
Electrical resistance against the flow of current
American wire gauge(AWG)
Energy
Cells can be connected together to make a battery

33. Identify the blueprint symbol for capacitors.
Symbol
Battery
Tolerence
The direction the negative charge moves

34. What is a property of inductors in electrical circuits?
Volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposes any change in the current flowing in a circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

35. What is the term for two or more cells attached together?
10
12 volts
Battery
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

36. What does a first band of white mean?
Two
First digit is 9
Grounding wire
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

37. What does a third band of brown mean?
From the negative battery terminal to the positive terminal
Secondary cell
10
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

38. What is the relationship of conductor size and length to resistance?
Current change in a coil creates a magnetic change
Resistance increases as the conductor length increases
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
5%

39. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Magnetic properties
How much potential difference can a material withstand before breaking down
Mutual induction

40. What do electrical charges need to cause a fire or explosion?
Choke
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Grounding wire
From the negative battery terminal to the positive terminal

41. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
DC current
American wire gauge(AWG)
High resistance

42. What do we call the ability to do work?
Silver
Energy
Ability to store an electric charge
Solenoid and Relay(both A and B)

43. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Parallel circuit
By their covering
Series circuit

44. What does an object have if a magnetic field acts on it?
Potential difference
Solenoid and Relay(both A and B)
Magnetic properties
The rate of doing work

45. Which material has the lowest resistance at ordinary temperatures?
Amperes
Silver
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)

46. What makes electrons flow?
Opposes any change in the current flowing in a circuit
Potential difference
Energy
High resistance

47. What is the basic law of magnetic force?
Unlike poles attract
Electrical resistance against the flow of current
75 Ohms
Produce heat - light - or limit current to control it(all of the above)

48. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
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)
Parallel
Cells can be connected together to make a battery

49. What does Ohm's Law represent?
15 -000 ohms - 20%
Relationship between current and potential difference
Voltmeter
Volts

50. What is the unit of measurement of electrical current?
Area and spacing of capacitor - static current in the capacitor(both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction
Amperes
Start with the band on the end and read to the center