Increase/decrease the magnitude of the EMF and the resistors by clicking
on the upper/lower part of the object. The values of the resistors range
from 1 to 10 ohms. And the value of the EMF ranges from -10 to +10 Volts.
Erase or replace the resistors by selecting the "Eraser" or the wire from
the menu. You can place up to four resistors. Resistors can only be placed
vertically.
The total resistance is determined as the sum of the resistors in series,
and in parallel