17. Complete Activity 10.17 (Page 123).
• Take a close look at the electric meter installed in your house. Observe its features closely.
• Take the readings of the meter each day at 6.30 am and 6.30 pm.
• Do this activity for about a week.
• How many ‘units’ are consumed during day time?
• How many ‘units’ are used during night?
• Tabulate your observations.
• Draw inferences from the data.
• Compare your observations with the details given in the monthly electricity bill (One can also estimate the electricity to be consumed by specific appliances by tabulating their known wattages and hours of operation).
Answer:
The features of the electric meter are given below:
(i) The meter displays the current consumption of electricity in terms of units (kWh).
(ii) The capacity is given in Amp/ kWh.
(iii) The specific meter number is also given.
The table is given below:
| Day of the week | Reading at 6:30 am | Reading at 6:30 pm | Units consumed during daytime | Units consumed during nighttime |
| Monday | 55790 | 55794 | 4 | – |
| Tuesday | 55800 | 55803 | 3 | 6 |
| Wednesday | 55810 | 55815 | 5 | 7 |
| Thursday | 55821 | 55824 | 3 | 6 |
| Friday | 55830 | 55834 | 4 | 6 |
| Saturday | 55840 | 55844 | 4 | 6 |
| Sunday | 55851 | 55855 | 4 | – |
From the data we can see that more energy is consumed at night than during the day. The energy consumption during both day and night are both consistent throughout the week.
The total consumption for the whole week = 55855 – 55790 = 65 units.
The electricity bill gives us the total unit consumption for the whole month = 270. We can estimate the unit consumption for 1 week = 270/4 = 67.5.
Therefore, the observations tally with the details given in the monthly electricity bill.
“• Take a close look at the electric meter installed in your house. Observe its features closely.
• Take the readings of the meter each day at 6.30 am and 6.30 pm.
• Do this activity for about a week.
• How many ‘units’ are consumed during day time?
• How many ‘units’ are used during night?
• Tabulate your observations.
• Draw inferences from the data.
• Compare your observations with the details given in the monthly electricity bill (One can also estimate the electricity to be consumed by specific appliances by tabulating their known wattages and hours of operation).” – Solved.
Related Links:
Solution to Activity 10.1
Solution to Activity 10.2
Solution to Activity 10.3
Solution to Activity 10.4
Solution to Activity 10.5
Solution to Activity 10.6
Solution to Activity 10.7
Solution to Activity 10.8
Solution to Activity 10.9
Solution to Activity 10.10
Solution to Activity 10.11
Solution to Activity 10.12
Solution to Activity 10.13
Solution to Activity 10.14
Solution to Activity 10.15
Solution to Activity 10.16
Solution to Activity 10.17
Solutions to Chapter 10 Work and Energy
