1. Chua Cong Yang | Khoo Yihan | Park Seong Jin 4S2 Inertia Physics: PBL Wired Up!

3. ApplianceWattage/WTime daily/hRoom Shaver155/60Bathroom Water Heater255240/60Bathroom Hair Dryer12005/60Bedroom Main Radio10120/60Bedroom Main Television Set11020/60Bedroom 2 Air Conditioning1900600/603 Bedrooms Washing Machine 350100/60Kitchen Iron100030/60Kitchen Toaster15505/60Kitchen Refrigerator172524Kitchen

4. ApplianceWattage/WTime daily/hRoom Vacuum Cleaner63015/60Living Room Laptop240120/60Living Room Television Set (Small) 7060/60Living Room Massage Chair5030/60Living Room Lights94019All rooms

6. RoomNo. of SocketsMax Current/A No. of Sockets used daily Current used daily/A Living Room8120460 Main Bedroom460345 Bedroom 24602 Bedroom 3460115 Kitchen460345 2 Bathrooms230115 TOTAL240 Given each power socket draws a maximum of 15A current before circuit trips

7. RoomNo. of lightsCurrent used/A Living Room31.68 Main Bedroom10.56 Bedroom 210.56 Bedroom 310.56 Kitchen21.12 2 Bathrooms21.12 TOTAL5.6 Lighting in each room is aligned in parallel. Each bulb is 10W.

8.  Built in RCD (Residual Current Device) that will trip the whole main circuit in the event of a current overload.  Earth wires built in for each power socket. The mains are fitted with an Earth Line Circuit Breaker to prevent electric shocks should the live or neutral wires be in contact with conductors in the appliances.  Lighting placed in parallel to ensure that if one bulb blows, the rest still works.

9.  Check for energy-efficient appliances, with labels as: ◦ To minimize electricity consumption (low wattage appliances).

10.  Set your clothes washer to the warm or cold water setting, not hot. ◦ Switching from hot to warm for two loads per week can save nearly 500 pounds of CO2 per year if you have an electric water heater, or 150 pounds for a gas heater.  Turn down your water heater thermostat. ◦ Thermostats are often set to 140 degrees F when 120 is usually fine. ◦ Each 10 degree reduction saves 600 pounds of CO2 per year for an electric water heater, or 440 pounds for a gas heater.

11.  Weatherize your home using caulk and weather stripping. ◦ Plug air leaks around doors and windows. ◦ Caulking* costs less than $1 per window, and weather stripping is under $10 per door. ◦ These steps can save up to 1100 pounds of CO2 per year for a typical home. ◦ * Caulking is one of several different processes to seal joints or seams in various structures and certain types of piping to cut energy costs in keeping rooms warm/cold.

12.  Usage of electricity by the household is consistent on a daily basis  No new appliances are added or removed from this circuit design  All the lighting used in the house is identical and of the same wattage.

13.  How do we apply our new knowledge to solve the problem? ◦ Seeking ways to get a design that minimizes cost. ◦ No compromise on safety.  What evidence is required to support our solution? ◦ Mathematical calculations to show cost-effectiveness.  Have we address all the concerns that surface in the problem? ◦ Troubleshoot any possible flaws in the design.

14.  http://en.wikipedia.org/wiki/Caulking http://en.wikipedia.org/wiki/Caulking  http://www.powerscorecard.org/reduce_ener gy.cfm http://www.powerscorecard.org/reduce_ener gy.cfm ◦ Last accessed on 14 th April 2012 ◦ [Online] Resource.

15. 4S2 | Inertia