Round 3 Station 9 and 10
Save your Plan!
Scenario:
After Typhoon Ompong struck the Philippines, many families faced increased electricity
bills due to damaged infrastructure, increased generator use, and unstable power rates.
As students in Barangay Carpenter Hill, you are tasked to help your household survive
financially by analyzing electricity consumption and identifying practical ways to reduce
the monthly bill. Your family’s budget is already strained due to typhoon damages, so
smart decisions must be made.
Table 1. Electricity Consumption for 5 months
Month
kWh Used
Rate per kWh (₱)
Total Bill (₱)
May
220
11.00
2,420
June
245
11.50
2,817.50
July
300
12.00
3,600
August
310
12.50
3,875
September
280
12.00
3,360
Your family's monthly income is only ₱10,000 after the typhoon. You need to cut down
the electric bill by at least 25% in the next month, or you will not have money for medicine
and food.
Tasks:
1. Plot a line graph showing the increase in electricity bills over 5 months (Table 1).
2. Calculate the average kWh consumption per month (Table 1).
3. Analyze what month had the highest and lowest cost per kWh (Table 1).
4. Write a Household Energy Saving Plan.
a. Justify which appliances will be used and for how long (Table 2).
b. Predict the new electric bill.
c. Suggest long-term changes.
Table 2. Actual Usage of Appliances
Appliance
Electric Fan
TV
Refrigerator
Lights (5 bulbs)
Rice Cooker
Wattage
60 W
100 W
150 W
10 W
700 W
Cellphone Charging
5W
Hours Used
Days/Month Total kWh
30
30
30
30
30
30
Key answers
1.
2.
3.
Highest Rate per kWh: ₱12.50 in August
Lowest Rate per kWh: ₱11.00 in May
4.
Reduce the September electric bill (₱3,360) by at least 25%.
Target Reduction=3360×0.25=₱840
New Target Bill=3360−840= ₱2,520
Table 2. Actual Usage of Appliances
Appliance
Electric Fan
TV
Refrigerator
Lights (5 bulbs)
Rice Cooker
Cellphone Charging
Wattage
60 W
100 W
150 W
10 W
700 W
5W
Hours Used
Days/Month
Total kWh
8 hrs
30
14.4 kWh
5 hrs
30
15.0 kWh
24 hrs
30
108.0 kWh
6 hrs
30
9.0 kWh
1 hr
30
21.0 kWh
2 hrs
30
0.3 kWh
Total Monthly Usage Estimate = 167.7 kWh
At ₱12.00/kWh, that would cost:167.7×12=₱2,012.40
d. Key answer
Table 3. Household Energy Savings Plan
Strategy
Use fan only 4 hrs/day
TV time cut to 2 hrs/day
Change to LED bulbs
Cook rice every other day
Unplug appliances when not used
Action
Cut 50% usage
Reduce by 60%
From 10W to 3W
Reduce use by 50%
Reduce phantom load by 5 kWh
Estimated Savings
Save 7.2 kWh
Save 9 kWh
Save 6.3 kWh
Save 10.5 kWh
Save 5 kWh
Total Savings = 7.2 + 9 + 6.3 + 10.5 + 5 = 38 kWh
New consumption = 167.7 - 38 = 129.7 kWh
New estimated bill = 129.7 × 12 = ₱1,556.40
Long-Term Suggestions
Use solar-powered lights/fans (Barangay may initiate project)
Invest in inverter appliances (energy efficient)
Community charging stations after calamities
Barangay “Energy Awareness Campaign” for all families