BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
FIGURE 12.
BASIC FLASHLIGHT SCHEMATIC.
To construct any graph of electrical quantities, it is standard practice to
vary one quantity in a specified way and note the changes which occur in a
second quantity. The quantity which is intentionally varied is called the
independent variable and is plotted on the horizontal axis. The horizontal
axis is known as the X-axis. The second quantity, which varies as a result
or the changes in the first quantity, is called the dependent variable and
is plotted on the vertical or Y-axis.
Any other quantities involved are
held constant.
For example, in the circuit shown in Figure 13 (on the following
page), if
the resistance was held at 10 Ohms and the voltage was varied, the
resulting
changes in current could then be graphed. The resistance is the
constant,
the voltage is the independent variable, and the current is the
dependent
variable.
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