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. How is the heat production measured in a resistor?
The direction of the magnetic field
Potential difference - E*I - current times current change from point to point(all of the above)
Unlike poles attract
Bonding and grounding

2. Which type of cell can be recharged?
Secondary cell
Potential difference - E*I - current times current change from point to point(all of the above)
Chemical action
Unlike poles attract

3. When reading resistance color codes - what does the first band indicate?
Potential difference - E*I - current times current change from point to point(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Composition of the resistor
First digit

4. What is capacitance in electrical terms?
Strength of the charge
Ability to store an electric charge
Alternating current
Breakdown voltage

5. Which way is the current going in the circuit shown?(electron flow)
Current change in a coil creates a magnetic change
From the negative battery terminal to the positive terminal
Purging
American wire gauge(AWG)

6. When reading resistance color codes - what does the fourth band indicate?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Tolerence
Current flows in one direction - potential differences across a load does not change(Both A and B)
The rate of doing work

7. How is capacitance determined?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Resistance increases as the conductor length increases
Use an effect to produce another effect
Area and spacing of capacitor - static current in the capacitor(both A and B)

8. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Electromagnetic field
Start with the band on the end and read to the center
Secondary cell

9. What determines whether a spark can be produced?
10%
Strength of the charge
How much potential difference can a material withstand before breaking down
Symbol

10. What can permanently break down a capacitor?
Voltmeter
High resistance
Breakdown voltage
Solenoid and Relay(both A and B)

11. The generator is what method of creating potential energy?
Electromagnetism
Parallel
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
First digit

12. What is resistance in electrical terms?
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to electrical current
Relationship between current and potential difference
The relationship of potential difference to current

13. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
First digit is 9
Use an effect to produce another effect
Unlike poles attract

14. What determines the resistance of a resistor?
Serial
Gauge number
Opposition to movement of free electrons
Composition of the resistor

15. What is the basic law of magnetic force?
Unlike poles attract
Potential difference
Alternating current
Stores electrical charge

16. What do junction boxes protect?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference
Wire splices
Heat and current control(both a and c)

17. What is the difference between AC and DC?
Series circuit
DC flows continuously in one direction and AC potential difference and current both change direction
20%
Resistance increases as the conductor length increases

18. What are the names of two of the six primary methods of producing a voltage?
Start with the band on the end and read to the center
Current flows in one direction - potential differences across a load does not change(Both A and B)
Series circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

19. What is the unit of measurement of electrical current?
Potential difference
Resistance increases as the conductor length increases
Unlike poles attract
Amperes

20. What is a DC circuit characteristic?
Bare - covered - insulated - stranded - cable(All of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
DC current
Serial

21. How many kinds of poles do magnets have?
75 Ohms
Two
10%
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)

22. What type of circuit has one path of follow through a load?
Cell
Breakdown voltage
Stores electrical charge
Series circuit

23. 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
A difference in potential energy
Opposes any change in the current flowing in a circuit
Bare - covered - insulated - stranded - cable(All of the above)
75 Ohms

24. What does static electricity do?
Does not move
Voltage
A magnetic field
Parallel circuit

25. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Potential difference
Potential difference - E*I - current times current change from point to point(all of the above)
10%

26. What is the type of cable composed of many fine wires?
Stranded
Alternating current
5%
Series circuit

27. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Secondary cell
Potential difference
Gauge number

28. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Electromagnetism
Composition of the resistor
Purging
20%

29. What is the term for doing work at the rate of joule per second?
Produce heat - light - or limit current to control it(all of the above)
The direction of the magnetic field
1 watt
Silver

30. What makes electrons flow?
Magnetic properties
Resistance value can not be changed
Serial
Potential difference

31. What do we call the ability to do work?
Energy
High resistance
Battery
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

32. What does a third band of brown mean?
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms
10
Magnetic properties

33. What is a characteristic of a fixed resistor?
Common - not rechargable - gradually discharges when in storage(All of the above)
Electromagnetism
Amperes
Resistance value can not be changed

34. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
12 volts
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)
Alternating current
Gauge number

35. What is resistance?
Fixed - Electrolytic - Variable(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Opposition to movement of free electrons
Two

36. In most applications - what remains constant if the current remains constant and flows in one direction?
Battery
Electrical resistance against the flow of current
Electromagnetic field
Serial

37. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Chemical action

38. What is a common measure of wire diameter?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol
Gauge number
Solenoid and Relay(both A and B)

39. What is induction?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
1/1000th of an inch
Purging
Current change in a coil creates a magnetic change

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

41. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Series circuit
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposition to electrical current

42. What is the unit of measurement of resistance?
1/1000th of an inch
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Ohms
Strength of the charge

43. What types of protective tapes are used?
Magnetic properties
Plastic - Rubber - Friction(all of the above)
Volts
Relay

44. What is insulation resistance?
Electrical resistance against the flow of current
Energy
Opposition to movement of free electrons
Fixed - tapped - variable(all of the above)

45. What does a transformer transform?
Volts
Potential difference
The direction the negative charge moves
The relationship of potential difference to current

46. What is voltage?
Ability to store an electric charge
Area and spacing of capacitor - static current in the capacitor(both A and B)
Ohms
A difference in potential energy

47. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The direction of the magnetic field
Volts
Parallel circuit

48. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Stores electrical charge
Current change in a coil creates a magnetic change

49. What is the name for electrical resistance of insulation?
Insulation resistance
Cables
Strength of the charge
Volts

50. What is a way to classify wires and cables?
By their covering
Opposition to electrical current
Secondary cell
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)