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Electron
Atom s


Physics ­ Core Revision notes
Heat transfer Atmosphere protection
Radio waves, microwaves, infra-red radiation and visible light are part of the
electromagnetic spectrum. Electromagnetic waves are electric and magnetic waves that travel
through space. The sun emits radiation in all parts of the electromagnetic spectrum and…

Page 3

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Smooth surface
Incident radiation
Non-metal

Page 4

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Page 5

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When a metal rod is heated at one end, the free electrons at the hot end gain kinetic
energy and move faster. o These electrons diffuse and collide with other free electrons and ions
in the cooler
part of the metal o As a result they transfer the kinetic energy…

Page 6

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Page 7

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o Elastic (or strain) energy
Energy stored in springy objects when we stretch or squash them o Electrical
energy
Energy transferred by an electric current o Thermal (heat) energy
Energy due to temperature. This is partly because of the random kinetic energy of the particles
of the object. When energy…

Page 8

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Page 9

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Worked example
An electric motor is used to raise an object. The object gains 60J of gravitational potential
energy when the motor is supplied 200J of electrical energy. Calculate the efficiency of the
motor.
Solution:
Total energy supplied to the device = 200J
Useful energy transferred to the device =…

Page 10

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Solution:
Power (in watts, W) = energy transferred (in joules, J)/time taken (in seconds, s)
Power = 10,000 J/ 25s = 400 W

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
+
Electron
Atom s


Physics ­ Core Revision notes
Heat transfer Atmosphere protection
Radio waves, microwaves, infra-red radiation and visible light are part of the
electromagnetic spectrum. Electromagnetic waves are electric and magnetic waves that travel
through space. The sun emits radiation in all parts of the electromagnetic spectrum and…

Page 3

Preview of page 3
Smooth surface
Incident radiation
Non-metal

Page 4

Preview of page 4

Page 5

Preview of page 5
When a metal rod is heated at one end, the free electrons at the hot end gain kinetic
energy and move faster. o These electrons diffuse and collide with other free electrons and ions
in the cooler
part of the metal o As a result they transfer the kinetic energy…

Page 6

Preview of page 6

Page 7

Preview of page 7
o Elastic (or strain) energy
Energy stored in springy objects when we stretch or squash them o Electrical
energy
Energy transferred by an electric current o Thermal (heat) energy
Energy due to temperature. This is partly because of the random kinetic energy of the particles
of the object. When energy…

Page 8

Preview of page 8

Page 9

Preview of page 9
Worked example
An electric motor is used to raise an object. The object gains 60J of gravitational potential
energy when the motor is supplied 200J of electrical energy. Calculate the efficiency of the
motor.
Solution:
Total energy supplied to the device = 200J
Useful energy transferred to the device =…

Page 10

Preview of page 10
Solution:
Power (in watts, W) = energy transferred (in joules, J)/time taken (in seconds, s)
Power = 10,000 J/ 25s = 400 W

Comments

No comments have yet been made