Energy Flashcards

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1
Q

What is the law of conservation of energy?

A

Energy can not be created or destroyed, it can only be transferred.

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2
Q

What is energy measured in?

A

Joules (J)

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3
Q

What is temperature measured in and what with?

A

It is measured in degrees Celsius/Centigrade (°C) using a thermometer.

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4
Q

What does temperature depend on?

A

The amount of energy in the thermal store.

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5
Q

What happens when a hot and cold object come into contact?

A

Thermal energy is transferred from the hot object to the cold one. The temperature will decrease until they are in thermal equilibrium.

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6
Q

How is energy transferred in solids?

A

Energy transferred in solids by the process called conduction.

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7
Q

How is energy transferred in liquids and gases.

A

Energy transferred in liquids and gases by convection.

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8
Q

Describe radiation.

A

Energy can be transferred by radiation through any medium, even where there are no particles. All objects emit radiation.

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9
Q

Complete the statement:

If the energy transferred to an object is less than the energy transferred from it,

A

…the object will cool down.

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10
Q

What three energy resources are fossil fuels?

A

Coal
Oil
Natural Gas

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11
Q

Are fossil fuels renewable or non-renewable?

A

Non-renewable.

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12
Q

Give some examples of renewable energy resources.

A
  • Wind
  • Wave
  • Solar
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13
Q

Power (W) =

A

Energy (J)
__________
Time (secs)

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14
Q

Electrical power (W) =

A

Potential difference (V) x Current (A)

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15
Q

Work (J) =

A

Force (N) x Distance (m)

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16
Q

Complete the statement:

Simple machines, like gears or leavers,

A

make it easier to do work but you do not get more energy out than what you put in.