Physics 2.4 - 2.7 Flashcards

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1
Q

What is power

A

Power is the rate at which energy is transferred over time

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2
Q

What is work done

A

Work done is the energy transferred to or from an object using a force over a certain distance

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3
Q

What is the power formula in terms of energy

A

P = e/t

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4
Q

What is the power formula in terms of work done

A

P = w/t

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5
Q

What does the e and t stand for in the power formula and their units?

A

E stands for energy given in joules and the t stands for time given in seconds

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6
Q

What does the w and t stand for in the power formula in terms of work done?

A

the w stands for work done given in joules and the t stands for time given in seconds

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7
Q

When is it appropriate to use the power formula in terms of work done

A

When a force is involved to move an object

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8
Q

When is it appropriate to use the regular power formula

A

When no force is involved

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9
Q

What is efficiency

A

Efficiency is a measurement of how efficient a device is when it comes to transferring energy

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10
Q

What is the efficiency formula and what are the units of each variable in it

A

Efficiency = Useful energy output / Total energy input where efficiency can be given as a decimal or percentage, useful energy output and total energy input are given as joules

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11
Q

Can a device be 100% efficient?

A

No device can be 100% efficient there is always some form of energy loss

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12
Q

What are sankey diagrams

A

Sankey diagrams are diagrams that are used to show the flow or transfer of energy in a process

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13
Q

Are sankey diagrams drawn to scale/

A

Sankey diagrams are always drawn to scale

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14
Q

How do you measure the energy at a specific point on the sankey diagram

A

You take the width of that point on the sankey diagram and convert the units using the scale provided

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