In the series circuit shown above, E = V₁ + V₂ + V₃
This means that in a series connection,
the voltage drop in each of the resistors add up to the applied source voltage.
The series combination of R1, R2, and R3
becomes a voltage divider. In a series circuit, the ratio between any two
voltage drops is the same as the ratio of the two resistances across which
voltage drops occur.
the voltage drop in each of the resistors add up to the applied source voltage.
The series combination of R1, R2, and R3
becomes a voltage divider. In a series circuit, the ratio between any two
voltage drops is the same as the ratio of the two resistances across which
voltage drops occur.
Given any resistor in a voltage divider,
Example 1
A
continuously-variable terminal voltage is often preferred rather than fixed
voltage provided by the simple voltage divider shown in the example above. This
can be obtained by a voltage divider in which a sliding contact moves along a
wire wound or carbon – resistance element ti form a potentiometer as shown in
figure 3 below
continuously-variable terminal voltage is often preferred rather than fixed
voltage provided by the simple voltage divider shown in the example above. This
can be obtained by a voltage divider in which a sliding contact moves along a
wire wound or carbon – resistance element ti form a potentiometer as shown in
figure 3 below
Example 2:
A
certain component in an electric circuit requires an un-operating voltage of
25v at a current drain of 50mA. If the supply terminal voltage of 40v is
applied, what is the value of the series dropping resistor required?
certain component in an electric circuit requires an un-operating voltage of
25v at a current drain of 50mA. If the supply terminal voltage of 40v is
applied, what is the value of the series dropping resistor required?
Solution
Since the circuit is a
series connected circuit, the series dropping current (ID) is equal
to the load current (IL)
series connected circuit, the series dropping current (ID) is equal
to the load current (IL)
Therefore, the series
dropping resistance RD can be calculated thus
dropping resistance RD can be calculated thus
