Energy Flashcards

(12 cards)

1
Q

What are the types of energy stores?

A

Chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic, nuclear.

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2
Q

What are the methods of energy transfer?

A

Mechanically, electrically, by heating, by radiation (light and sound).

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3
Q

What is the principle of conservation of energy?

A

Energy cannot be created or destroyed, only transferred or transformed.

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4
Q

What is the formula for efficiency?

A

efficiency = (useful energy output / total energy output) × 100%.

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5
Q

How can energy transfers be represented?

A

They can be represented by Sankey diagrams.

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6
Q

What is the relationship between work done, force, and distance?

A

work done = force × distance moved

W = F × d

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7
Q

What does work done equal?

A

Work done is equal to energy transferred.

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8
Q

What is the formula for gravitational potential energy?

A

gravitational potential energy = mass × gravitational field strength × height

GPE = m × g × h

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9
Q

What is the formula for kinetic energy?

A

kinetic energy = ½ × mass × speed²

KE = ½ × m × v²

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10
Q

How does conservation of energy relate to gravitational potential energy and kinetic energy?

A

It links gravitational potential energy, kinetic energy, and work.

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11
Q

How is power defined?

A

Power is the rate of transfer of energy or the rate of doing work.

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12
Q

What is the relationship between power, work done, and time taken?

A

power = work done / time taken.

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