P15: Energy Transfers and Efficiency Flashcards

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1
Q

Conservation of energy

A

Energy cannot be created or destroyed.

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2
Q

How can energy be stored?

A

> Elastic Potential Energy is stored when something is stretched.

> Gravitational Potential Energy is stored when an object is lifted.

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3
Q

Useful Energy

A

Energy transferred to where it is wanted, in the form that it is wanted.

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4
Q

Wasted Energy

A

The energy that is not usefully transferred.

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5
Q

What usually happens to wasted energy?

A

It spreads out and dissipates.

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6
Q

What happens as energy spreads out?

A

It becomes less useful.

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7
Q

Efficiency =

A

Useful power out/ total power in. (x 100)

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8
Q

Sankey Diagram

A

Used to measure efficiency

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9
Q

The lower the U-Value of a material…

A

… The more effective it is as an insulator.

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10
Q

U-Values

A

A measure of the energy per second that passes through a material when the temperature differnece across it is 1C.

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11
Q

4 features of a well insulaed house.

A

> Loft Insulation. (Fibreglass is good)

> Cavity wall insulation.

> Tin foil behind the radiators

> Double glazed windows.

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12
Q
A
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