dissipatio

Notes

dissipation? Energy spreads out everywhere and we can use it anymore Energy is in one place =7 useful Energy spreads everywhere =7 wasted Dissipation is when energy spreads out into the surroundings and becomes less useful. youtube on a light Energy comes from the battery =7 goes to the bulb The bulb moves light (useful) and heat (not really useful) the light and heat spread out into the room. They go everywhere you can't collect them and can't be used again lubricants are substances that reduce friction between surfaces so they move more easily and waste less energy friction happens because rough surfaces grip each other. needing more force and producing heat. lubricants are substances like oil or grease that are placed between surfaces to reduce friction so less energy is wasted. filament bulb uses 60w 80% becomes heat (wasted) 20% becomes light (useful) LED bulb uses 9w only 80% becomes light (useful) 20% becomes heat (wasted) Wednesday 22 April 2020 ## Using electricity **Do Now -** - Renewable - will never run out - Non renewable - will run out at some point. **Useful energy - this is the energy that helps us do what we want** - its in the right place - its in the ...