BASIC ELECTRONICS - OD1633 - LESSON 1/TASK
(1) Voltage in a Parallel Circuit.
You have seen that the source
voltage in a series circuit divides proportionally across each resistor in
the circuit. In a parallel circuit, the same voltage is present in every
branch.
A branch is a section of a circuit that has a complete path for
current. In figure 42 on the previous page, this voltage is equal to the
applied voltage (Es). This can be expressed in equation form as:
Es = ER1 = ER2
Voltage measurements taken across the resistors of a parallel circuit, as
illustrated by figure 43, verify this equation.
Each meter indicates the
same amount of voltage. Notice that the voltage across each resistor is the
same as the applied voltage.
FIGURE 43.
VOLTAGE COMPARISON IN A PARALLEL CIRCUIT.
Example: Assume that the current through a resistor of a parallel circuit is
known to he a 4.5 milliamperes (4.5 mA) and the value of the resistor 30,000
Ohms. Determine the source voltage. The circuit is shown in figure 44 on
the following page.
Given:
R2 = 30,000 Ohms
IR2 = 4.5 milliAmps
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