P1
- Created by: g3mm4
- Created on: 12-06-15 13:27
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- P1 - Energy for the home
- Heat and temperature
- Specific Latent Heat: The energy needed to melt or boil 1kg of material
- Energy transferred = mass x s.l.h
- Specific Heat Capacity: The energy needed to raise the temp. of 1kg of material by 1 degrees C.
- Energy transferred = mass x s.h.c x temp. change
- Temperature is a measure of hotness on an arbitary scale.
- Energy is a measure of energy transfer on an absolute scale.
- Specific Latent Heat: The energy needed to melt or boil 1kg of material
- Energy Transfer
- Air is a good insulator and reduces energy transfer by conduction.
- Trapped air reduces energy transfer by convection
- Shiny surfaces reflect infrared radiation
- Energy can be saved in the home by
- Double Glazing
- Cavity Wall Insulation
- Reflecting Foil
- Loft Insulation
- Curtains
- Energy efficiency = useful energy output (x100%) / total energy input
- Payback time = cost of installation/ annual savings
- Waves
- Laser light is a single colour and in phase.
- Signals are sent along optical fibres by total internal reflection
- EM Spectrum = Radio, Microwave, Infrared, Visible, UV, X-ray, Gamma
- Wave speed = frequency x wavelength
- The stable Earth
- Earthquake waves help us find out about the structure of the Earth.
- Exposure to UV rays causes sun burn and skin cancer
- Untitled
- Heat and temperature
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