Team+5_display

Task 2_ REFLECT Our Physics E-learning Mindmap: [|bubblus_Physics_Home_learning.jpg]

Task 3_ DO

Our calculations: 6. A lot of energy is wasted and is not used to heat the popcorn. The wasted energy was used to heat the surrounding air. Also not all the power given to the appliances are converted to the microwaves and the thermal energy used to heat the popcorn. Some are lost to heat up the appliances itself, and some are lost as sound from the appliances. Also some are lost as kinetic energy when the gears move.

7. Overall efficiency will be about 34%*0.2% to give about 0.07% for the microwave and 34%*0.3% to give about 0.1% for the stove. The energy required from natural resources is about 100/0.1*64765J to give about 65MJ.