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Lesson 7, Topic 1
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# Electrical Meter Reading and Blling

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To calculate the electricity bill of a consumer, the following must be considered

1. Total power rating of appliances in kilowatts
2. Number of hours appliances are on
3. Amount in kilowatts
4. Number of units in kilowatts hour is power (KW) x time (hour)
5. Change per unit
6. Meter maintenance charge (mmc)

Example 1

If power = 10KW

Time = 10 hrs

Unit charge  = N5.00

MMC = N150.00

Calculate the bill for the month

Solution:

Number of unit in KW/hr = Power x Time

= 10 x 10

= 100KW/hr

Electricity bill for the month = Number of unit in KW/R x Unit charge + MMC

= (100 x 5) + 150

= 500 + 150

= N650

Example 2

Find the cost of running five 60W lamps and four 100W lamps for 8 hrs. If electric energy cost 5.0k per unit

1kilowatt/hour = 1000 watt/hours

1000 joules per sec for one hour = 1000 x 60 x 60 Joules

= 3600000 joules.

Solution

Total power consumption

(5 x 60) + (4 x 100) = 100W

Time = 8 hrs

Energy consumed = 700 x 8

= 5600 KWHR or

= 5.6 KWhr

Cost = 5.0k

Cost = 5.0 x 5.6

= 28k

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