A simple tutorials on how to perform basic computation of electrical consumption

3. How will you compute electric
consumptions?

4. Energy consumption calculation. The
energy E in kilowatt-hours (kWh) per
day is equal to the power P in watts
(W) times number of usage hours per
day to divided by 1000 watts per
kilowatt: E(kWh/day) = P(W) ×
t(h/day) / 1000(W/kW)

5. Power consumption
E= (P(Watt) × Hour/
1000(kW))*rate

6. A refrigerator
consumes 10 hours
per day with 200
watts, how much is
the daily power
consumption?

7. E= (P × H/KW) x 10
= daily basis
Given:
200Watts, 10 hours,
10 Pesos per Kilowatt/Hr

8. E= 200W × 10/1000 *10
= 2000/1000*10
= 2*10
=20 Pesos /day
= 20 X 30 days
PHP 600/ Month
10 Pesos per Kilowatt/Hr
E= P × Hr/KW x 10
-to get
the
monthly
cost

9. E= 200W × 10/1000 *10
= 2000/1000*10
= 2*10
=20 Pesos /day
10 Pesos per Kilowatt/Hr
E= P × Hr/KW x 10

10. Energy is charged at 10 pesos per kWh 1 PC
uses 100W
• What is the cost for 1 PC in 8 hours a day?
• What is the cost per month?
E = P X Hr / 1KW
= 100W X 8 hrs / 1000
= 800/1000
= .8 W X 10 Rate
= 8 Pesos a day
= 8 Pesos a day
= 8 X 30
= 240 Pesos

11. Energy is charged at 10 pesos per kWh 1 PC
uses 100W
• What is the cost for 1 PC in 8 hours a day?
• What is the cost per month?
Other solution:
E = P X Hr / 1KW = (100W X 8 hrs x 30)/1000
= 24 X 10 per day
= 240 Pesos / Month

12. Appliance types Power
Consumption
(Watts)
Hour used/ day
or week
Air conditioner 1
HP
1000W 6 hrs /day
How much will I pay for my Air
conditioner power consumption
for one month?

13. Air conditioner 1000W 6 hrs /day
E = P X Hr / 1KW = (1000W X 6
hrs x 30)/1000
= 180 X 10 rate =
= 1,800 Pesos / Mo
Other solution:
= (1000W X 6 hrs x 30)/1000
= 180 X 10 per day
= 1,800 Pesos / Month

14. Activity
1.Group yourselves in 6 groups
2.Take a picture of your assigned problems.
Duration: 15 Mins

15. System Unit Type
(without monitor)
Power
Consumpt
ion
(Watts)
Hour used/
day or week
Conventional Desktop
PC – no power
management
110W 2 hrs/ week
Laptop PC 60W 1.5 hrs /day
Notebook PC 40W 2hr /day

16. Monitor type Power
Consumptio
n (Watts)
Hour used/
day or week
Conventional CRT
monitor – 19 inch
140W 2 hr/ week
Conventional CRT
monitor - 17 inch
80W 1hr / week
LCD Monitor – 19
inch
50W 1hr /day
LCD Monitor – 17
inch
30W 1.5 h /d

17. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
Television
32”(LED)
40 W 2 hr/ day
Flat Iron 1000W 1/2hr / day
Electric Stove 1500W 1hr /day
Electric
Fan(Wall)
75W 8 hrs/day

18. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
Water Pump 500W 1.5 hrs /day
Fluorescent 20” 20W 8 hrs / day
Incandescent
Lamp
50W 8hrs/day
Kittle 500 W 1hr /week

19. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
Light( LED) 12W 8 hr/ day
Fluorescent 40” 40W 8hr / day
Incandescent
Lamp
100W 8 hr /day
Kittle 500 W 1/2hr /day

20. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
Washing
Machine
500W 2 hr/ week
Vacuum Cleaner 800W 1hr / week
Hair blower 60W 1hr /day
Blender 800 W 1hr /week

21. 1. Movie on TV/DVD (200 W) for 2
hours /day

22. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
TV/DVD 200W 2 hr/ day
Vacuum Cleaner 800W 1hr / week

23. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
TV/DVD 200W 2 hr/ day
1. (200 X 2 X 30) = 1200W /1000W
12 x 10 Pesos =
120 Pesos

24. Appliances
types
Power
Consumptio
n (Watts)
Hour used/
day or week
Vacuum Cleaner 800W ½ hr /day
2. (800 X 1/2 X 30) = 1200W /1000W
12 x 10 Pesos =
120 Pesos

25. Appliances types Power
Consumpti
on (Watts)
Hour used/
day or week
1.TV/DVD 200W 2 hr/ day
2.Vacuum Cleaner 800W 1hr / week
1. 120 Pesos
+
2. 120 Pesos
240 Pesos

26. ASSIGNMENT:
1. Search in google the actual rate of
power consumption
2. List all the appliances at home and
find out what are the wattages.
3. Compute the power consumptions
per month
4. You may use your notebook or
paper of your answers.