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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. Why is the transformer important to AC electricity?

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2. What does a third band of brown mean?
Produce heat - light - or limit current to control it(all of the above)
10
Cells can be connected together to make a battery
5%

3. What is the use of the electromagnet?
Resistance increases as the conductor length increases
By their covering
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Breakdown voltage

4. 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
5%
Series circuit
Energy
75 Ohms

5. What is a type of capacitor?
Relationship between current and potential difference
A magnetic field
Fixed - Electrolytic - Variable(all of the above)
Opposition to electrical current

6. What does Ohm's Law represent?
Relationship between current and potential difference
Fixed - Electrolytic - Variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Resistance value can not be changed

7. What does a first band of white mean?
First digit is 9
Start with the band on the end and read to the center
The direction the negative charge moves
Wire splices

8. What is a common form used in conductors?
Tolerence
Potential difference
Magnetic properties
Cables

9. What is a type of mechanical transducer?
Use an effect to produce another effect
Solenoid and Relay(both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
10

10. What is a common measure of wire diameter?
The direction the negative charge moves
How much potential difference can a material withstand before breaking down
Gauge number
Parallel circuit

11. What is induction?
Current change in a coil creates a magnetic change
Volts
1 watt
Potential difference - E*I - current times current change from point to point(all of the above)

12. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Strength of the charge
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Composition of the resistor
5%

13. 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)
First digit
Electromagnetic field
Composition of the resistor

14. What is the unit of measurement of electrical current?
20%
From the negative battery terminal to the positive terminal
Amperes
A magnetic field

15. What do junction boxes protect?
Wire splices
Plastic - Rubber - Friction(all of the above)
Voltmeter
Symbol

16. What do we call the ability to do work?
Gauge number
Electromagnetic field
Energy
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

17. What is an electromagnet?
Potential difference
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC flows continuously in one direction and AC potential difference and current both change direction
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

18. The generator is what method of creating potential energy?
Electromagnetism
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
50 Ohms
High resistance

19. Where does the thumb point in both Left-Hand Rules?
The rate of doing work
A magnetic field
The direction the negative charge moves
5%

20. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Current change in a coil creates a magnetic change
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Does not move

21. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Unlike poles attract
Opposition to electrical current
Use an effect to produce another effect

22. Identify the general blueprint symbol for inductors.
Symbol
Alternating current
Cells can be connected together to make a battery
Fixed - tapped - variable(all of the above)

23. Which material has the lowest resistance at ordinary temperatures?
Serial
Plastic - Rubber - Friction(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)
Silver

24. What is voltage?
A difference in potential energy
DC flows continuously in one direction and AC potential difference and current both change direction
Solenoid and Relay(both A and B)
75 Ohms

25. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Fixed - Electrolytic - Variable(all of the above)
50 Ohms
Mutual induction
DC current

26. Which of the following materials is NOT a good conductor?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Porcelain
Volts
By their covering

27. What is the type of cable composed of many fine wires?
Stranded
Resistance increases as the conductor length increases
Purging
Start with the band on the end and read to the center

28. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
15 -000 ohms - 20%
Potential difference
Current flows in one direction - potential differences across a load does not change(Both A and B)
20%

29. What is the name for electrical resistance of insulation?
DC current
Gauge number
Insulation resistance
10%

30. What is resistance in electrical terms?
Gauge number
Battery
First digit is 9
Opposition to electrical current

31. What is a switch that operates by electricity?
Does not move
Relay
Potential difference - E*I - current times current change from point to point(all of the above)
Ability to store an electric charge

32. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Volts
Chemical action

33. What is an arrangement of materials that create a potential difference by chemistry?
High resistance
Magnetic properties
Cell
By their covering

34. What is the unit of measurement of resistance?
Fixed - Electrolytic - Variable(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Ohms
Purging

35. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Porcelain
1/1000th of an inch
Gauge number

36. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Heat
12 volts
Area and spacing of capacitor - static current in the capacitor(both A and B)

37. To what measurement do the conductor mills refer?
1/1000th of an inch
Does not move
Chemical action
American wire gauge(AWG)

38. How is capacitance determined?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms
Serial

39. When reading resistance color codes - what does the first band indicate?
By their covering
Produce heat - light - or limit current to control it(all of the above)
First digit
Strength of the charge

40. The thermocouple uses which method for creating potential energy?
Mutual induction
Current flows in one direction - potential differences across a load does not change(Both A and B)
Series circuit
Heat

41. What is a characteristic of insulators?
5%
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electromagnetic field
10%

42. What is the purpose of capacitors in electrical circuits?
10%
Stores electrical charge
The relationship of potential difference to current
Potential difference

43. What does a moving charge produce?
From the negative battery terminal to the positive terminal
15 -000 ohms - 20%
20%
A magnetic field

44. What instrument measures voltage?
Two
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
15 -000 ohms - 20%
Voltmeter

45. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Chemical action
Does not move
Heat

46. What are the names of two of the six primary methods of producing a voltage?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Bonding and grounding
15 -000 ohms - 20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

47. How do you read resistor color codes?
Start with the band on the end and read to the center
Volts
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons

48. What is the purpose of resistors in electrical circuits?
First digit is 9
Produce heat - light - or limit current to control it(all of the above)
The direction of the magnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

49. When does a DC circuit oppose current flow?
75 Ohms
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Battery
Solenoid and Relay(both A and B)

50. What is a common cause of static electricity in a shop?
Resistance increases as the conductor length increases
How much potential difference can a material withstand before breaking down
Moving vehicles
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