Practical Skills- ENVS3

Angle of incidence:

• Measured using card with pencil syuck on at 90 degrees to the card
• Pencil must cast no shadow
• Orentation of card measured with protracter and compass

Light Scatter:

• measured using directional light meter
• light readings taken at different angles to the sun (same equipment used to measure angle of incidence)

Light Intensity:

• measured using electronic light meter
• Can use camera with required shutter speed at a fixed aperture

Wind Velocity:

• Ideal location where wind velocity is high
• Doubling wind velocity increases available power eight-fold

Local Factors investigated

• distance from ground
• topography
• aspect in relaton to prevailing winds
• nearby trees or buildings

Water available for use:

• Precipitation
• Evaporation
• Transpiration

Residual amount- affceted by climate

Investigations on evaporation:

• temperature
• wind velocity
• humidity

rate of heat loss- heat energy added to maintain constant temp

• Thermal Insulation
• Volume

standarised factors:

• Material objects are made of
• 3D shape- ensures surface area:volume ratio is constant
• colour- darkness and texture of the surface
• Experimental conditions (room temp, air movements, contact with other materials and surfaces)
• 

Calculated using specific heat capacity and temp of materials used