BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 1
17. The circle containing E, I, and R is divided into two parts, with E
above the line and I and R below the line.
To determine an unknown
quantity, first cover that quantity with a finger.
The position of the
uncovered letters in the circle will indicate the mathematical operation to
be performed. For example, to find I, cover the I
DETERMINING VOLTAGE IN A BASIC CIRCUIT.
with a finger.
The uncovered letters indicate that E is to be divided by R,
To find the formula for E, cover E with your finger. The result indicates
that I is to be multiplied by R, or E = IR.
To find the formula for R,
cover R. The result indicates the R is to be divided by I,
You are cautioned not to rely wholly on the use of this diagram when you
transpose the Ohm's law formulas. The diagram should be used to supplement
your knowledge of the algebraic method.
Algebra is a basic tool in the
solution of electrical problems.