Have you ever thought about how much electricity we use?

1
Have you ever thought about how much electricity
we use?
Could we use a measuring stick?
How could we find out?
2
The electricity we use is measured by a meter.
3
I went to a school to find out how much
electricity was used each day. The class recorded
the meter reading at the end of each day. At the
start of the exercise, the meter reading from
the end of the previous week was 20111 units.
4
The meter readings throughout the week are
recorded below. Can you work out how many units
were used on Monday? Now work out how many units
were used on each day of the week. What
calculation do you need to do?
START 20111 units
Monday 20276 units
Tuesday 20437 units
Wednesday 20631 units
Thursday 20794 units
Friday 20950 units
5
Did you manage to work it out? If you got stuck,
here is an example below to get you started.
Monday 20276
START - 20111
Units used
6
DAY Units used
Monday
Tuesday
Wednesday
Thursday
Friday
165 units
Here are the answers. How did you do?
161 units
194 units
163 units
156 units
7
On which day of the week was most electricity
used? List some reasons why more electricity
might have been used on this day.
Could it have something to do with the weather,
what went on in school or something that happened
on the previous evening?
8
Does it matter what time the meter reading is
taken? Can you find out how much electricity
is used in your school?
This PowerPoint and lesson are based on work by
Ian Mitchell, The Green Egg Company, developed
edited by Amie Andrews for TLCP and Ali Ross,
Sundog Energy.