17
Example 2:
The illustration below shows two 10 ohm load resistors, in parallel, placed across both sets of the
OUTPUT terminals. The total resistance is really 6 ohms (5 ohm “parallel” load resi 1
ohm sense resistance). While the fuel cell is shown as the power source, a battery, solar panel
or wind turbine can also be substituted.
The equivalent circuit is shown below:
Microprocessor
1 ohm
sense
resistor
INPUT
OUTPUT
USB
Connector
+5V
GND
Voltage
LED
Current
LED
O
H
ME
A
10 ohm
Load
resistor
10 ohm
Load
resistor
1 ohm
sense
resistor
10 ohm
Load
resistor
= 6 ohms total
10 ohm
Load
resistor
R1
R2
R
parallel
=
R1 x R2
R1 + R2
=
5 ohms
