# How much will you pay a month at Php 1.50 perr kilowatt-hour, if you leave a 25 watt electric bulb lighted every night from 8:00 pmto 5:00 am?

1
by TigerCharles

2015-03-31T09:41:27+08:00

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Given:

Price of the electricity = P1.5 per kilowatt-hour

Electric Bulb = device used

Wattage of the Electric Bulb = 25 watts

Range of time used = 8: 00 pm - 5: 00 am in 1 month

Find:

Payment out from the variables.

Solution:

Step 1:  We get the wattage of the device used.

Step 2 : We get the number of hours the device was used.

Step 3: We multiply the wattage with the number of hours used.

Step 4: We change the unit to kilo-watt hours.

Step 5: We multiply the result by the price.

Wattage = 25 watts

Number of hours used = 8:00 pm - 5:00 am = 9 hours

( I assumed that 1 month = 30 days)

30 x 9 hours = 270 hours

25 watts x 270 hours = 6, 750 watt-hours

6, 750 watt-hours x =  = 6. 75 kWh or 6. 75 kilo-watt hours

6. 75 x P1.5 = P10. 125