What
is a Kilowatt-hour?
For every 10 hours a 100-watt bulb burns, one kilowatt-hour of electricity
is used. Meters operate with clock-like accuracy because they are
sealed to keep the interior free of dust and other contaminants.
Also, the use of a magnetic-suspension system all but eliminates
friction inside the meter.
What Makes the Disk Revolve?
The amount of electricity you use determines the speed at which
the disk moves. The more electricity you use, the faster it turns.
Each revolution measures a precise amount of electric energy
called watt-hours, usually 7.2 watt-hours. This measurement is
transferred from the disk through a series of gears to the pointers
on the dial.
How
the Meter Records Electrical Use
Most meters have five dials across the front. Meters work similar
to the odometer on your car. When the hand on one dial makes
a complete circle, the hand on the dial to its left moves up
one number. Two sets of connections tell your meter what it needs
to know:
- the
amount of current flowing into your house, and
- the
pressure - or voltage - at which the current is flowing.
Electric
current is like water flowing through a pipe. The rate of flow
of electrons through your line is measured in amperes. Pressure
is the force electron through your line is measured in amperes.
Pressure is the force that pushes electric current through your
lines, measured in volts. To determine the watts of electricity
you use, you meter multiplies amperes of current by volts of
pressure. This total-- expressed in kilowatts-hours- is the basis
of you monthly electric bill. |