QUESTION 12

DESIGNING FOR A RICE COOKER

Modification	Explanation
The body is made up of material with low density	This will not add the total weight of the cooker and make it more portable
The rice pot is made up of material with low specific heat capacity	The increase in temperature is very large when heat is absorbed and decrease the time to cook the rice
The heating element placed at the centre of the rice cooker	Most of the heat generated is used to cook the rice instead waste to the surrounding
The outer layer of the body of the rice cooker is made up of material with low conductivity of heat	The body conduct a little of heat to the surrounding . The warm rice can be kept long
The rice pot closed tightly	To prevent of heat loss through the surrounding through convection

QUESSTION 13

REDUCE THE ENERGY CONSUMPTION OF A HOUSE

Modification	Explanation
Use linear fluorescent tubes and energy –efficient compact fluorescent light bulb(CFLs)	Fluorescent lamps are more efficient which last longer
Install a water heater	renewable sourse is used and can last longer
Insulate either wall floor or under the roof	Adding insulation creates more uniform temperature and increase comfort
install white windows shades,drapes (langsir)or  blinds	To  reflect heat away from house
Clean electrical appliances such as air-conditioner or fan	Prevent dirt and debris from clogging the fins and hence reduce the efficiency