E10 – Problem Set #1 Solutions
Materials Science and Engineering Module on Batteries and Fuel Cells
Was due: 5:10PM on Wednesday, October 27, 2010
1 of 3
1.
Voltage divider
In lab#1, you experimented with the following circuit, which is commonly known
as a
voltage divider
.
Describe in words the output voltages (V
1
, V
2
, V
12
) of this
circuit and why it is a voltage divider.
The output voltages, in equation form, are given on the right. The voltage divider
splits the total voltage such that the voltage (V
1
or V
2
) across any resistor (R
1
or
R
2
, correspondingly) is the total voltage (V
12
) multiplied by the fraction of the
total resistance that resistor takes up. (The worked solution for this circuit can be
found in Lab #1 solutions supplement.)
2.
Electricity
Suppose you are teaching a thirdgrader about electricity. Give an analogy to
explain Ohm’s law. For example, the flow of water pumped up a hill is often used
to describe current; the pump is the battery and the height of the hill is the
potential.
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 Spring '08
 righter
 Dynamics, Electron, Materials Science And Engineering, Volt, Electric charge, Cathode, Anode

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