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Energy & Power Flashcards

0
Q

The opposition to current flow is more properly called?!

A

Resistance

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1
Q

The force motivating electrons to flow in a circuit is called what?

A

Voltage

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2
Q

what are the units of resistance

A

Ohms

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3
Q

One coulomb of charge is equal to?!

A

6,250,000,000,000,000,000 electrons

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4
Q

What is the standard unit for power? Metric unit for power?

A

Horsepower, watts

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5
Q

The most common schematic symbol for a resistor is?!

A

A zig-zag line

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6
Q

What is the total resistance of a series circuit with three resistors of 10, 20, & 30 ohms.?

A

60 ohms

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7
Q

Convert 1 kilo ohm to ohms.

A

1000 ohms

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8
Q

What is the total efficiency of 500 workout in 1000 power in?

A

50 percent

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9
Q

Ohms law is V=IR. What does “I,” “V,” and “R” stand for in the equation?

A

I=current, V=voltage, R=resistance

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10
Q

If you have a line of 4 resistors in series with 2.3 ohms, 4.6 ohms, 1.4 ohms, 4.5 ohms what is the total resistance?

A

12.8 ohms

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11
Q

What is efficiency?

A

The ratio of useful work preformed by a machine or in a process to the total energy expanded or heat taken in.

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12
Q

What is the formula for electric power?

A

P=IV

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13
Q

What is electric power measured in?

A

Watts

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14
Q

What is the formula to figure power

A

P=E/T (power=energy divided by time)

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15
Q

1500 joules, is how many Ws

A

1500 Ws

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16
Q

How many watts in 1hp

A

746w= 1hp

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17
Q

What kind of energy does the wind have?

A

Kinetic energy

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18
Q

1.5Mw = ____kw

A

1500kw

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19
Q

15kw=______w?

A

1500w

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20
Q

What’s the base unit measurement of mass?

A

Kilograms

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21
Q

What’s the unit of efficiency?

A

Efficiency is unit less!

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22
Q

How much energy is stored if a battery is charged at a rate of 100 Watts for 10 seconds?

A

1000 Joules

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23
Q

What does 1 horsepower = to?

A

746 watts

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24
Q

Power in. Power out efficiency Power wasted

1000 500 ? 500

A

Efficiency= 50%

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25
Q

If I get 167 w out of 222 w what is the efficiency?

26
Q

If you have an atom with 25 protons with a +2 charge, how many electrons does it have?

A

23 electrons

27
Q

What is matter made up of?

28
Q

The only reason protons bind together in the nucleus of an atom is because of a much stronger force called?

A

Strong nuclear force

29
Q

The result of an imbalance of this “fluid” (electrons) between objects is called?

A

Static Electricity

30
Q

In conductive materials, the outer electrons in each atom can easily come or go, and are called?

A

Free Electrons

31
Q

The symbol for voltage is ….

A

“E” or “V”

32
Q

Resistance is measured in …..

33
Q

1 Horsepower = how many watts?

A

745.7 Watts

34
Q

75 Watts equals how many joules per second.

A

75 joules per second

35
Q

What does a circuit breaker do?

A

It detects overloads and short circuits, then automatically interrupts the current flow.

36
Q

____________ is where the current through a component actually decreases as the applied voltage across it is increases

A

Negative Resistance

37
Q

If you have 3600J how many ws is that?

A

3600 watt seconds

38
Q

What is the formula for power (P)?

39
Q

What is resistivity?

A

Resistivity is the resistance that a material has per a unit of distance

40
Q

What is a wh?

41
Q

If you have a 5000N brick and you are moving it 10m how much work did you perform?

42
Q

What do opposite polarities do?

43
Q

What do similar polarities?

44
Q

Does a positive ion have an extra electron?

45
Q

Electrons tend to _________ other electrons.

46
Q

Stored energy or energy stored is also known as what?

A

Potential Energy

47
Q

Can energy be created and destroyed?

A

No, energy is only conserved. The total energy in a system will stay the same.

48
Q

Power =

A

E/T

ie. energy divided by time

49
Q

How do cold and hot temperatures effect the conductivity of a wire?

A

A cold wire allows for a faster current to flow through it. A hot wire has a slower moving current.

50
Q

One horsepower equals how many watts?

51
Q

What is the symbol for amps?

52
Q

What are the symbols for voltage?

53
Q

Ohms law will help you find?

A

Resistance,current,and voltage

54
Q

What is the equation for Ohm’s law

55
Q

If the Voltage increases and the Current Increases the Resistance does what?

A

Stays the same

56
Q

What type of electricity causes two balloons to stick together?

A

Statice Electricity.

57
Q

75 Watts equals how many joules per second.

58
Q

75 watts equals how many joules per minute?

A

4,500 Joules per minute

59
Q

75 watts equals how many joules per hour?

A

270,000 joules per hour

60
Q

20 Watts equals how many joules per hour.

A

72,000 joules per hour

61
Q

45 Watts equals how many Joules per minute

A

2,700 Joules per minute

62
Q

If the Voltage stays the same and the Current decreases the Resistance does what?

Electricity (4 decks)

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