sand is level.4 Hold the cup 6 inches (15 cm) above the bowl.
5 Ask your helper to start the timer as soon as you remove the tape from over the hole in the cup. Stop the timer the instant the sand stops flowing from the cup.FIG 1
6 Repeat the experiment four times, and then average the times taken from all the tests.
7 Calculate the flow rate of the sand using the following equation:
Note: The volume of the sand is equal to the volume of the cup used.
What Happened?
The flow of sand passing through the hole can be described as the volume measured in ounces (mL) of sand that passed a given point in one second. The flow rate of sand is not an exact model of the flow rate of electrons, but it does model measuring the flow rate of the material. The larger the hole in the cup, the greater will be the flow rate of sand. The same is true with an electric wire: the larger the diameter of the wire, the greater will be the current of electricity flowing through.
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