resistance in series experiment
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Objective:
In this experiment you will set up three circuits: one with resistors in series, one with resistors in
parallel, and one with some of each. You will be building circuits similar to the ones you will be
working with in homework and exam problems. This experiment should show you the difference
between resistors in series and parallel. If you understand what we are doing in this experiment,
you will be all set to do well on the midterm questions about circuits!
Equipment:
Resistors (R1 = 2.2 kΩ, R2 = 6.8 kΩ, and R3 = 4.7 kΩ), multimeter, and DC power supply.
Theory:
In the first part of this experiment we will study the properties of resistors, which are connected
“in series”. Figure 1 shows two resistors connected in series (a) and the equivalent circuit with
the two resistors replaced by an equivalent single resistor (b), as we discussed in the lecture.
Remember from lecture that, when resistors are connected in series, each one “sees” the same
current. Recall the water analogy: If you have two pipes that have different diameters but are
connected in series and you send water through them, each receives the same amount of water,
there are no branches into which the water can split. In lecture, we showed that the equivalent
resistance for resistors in series is
Req = R1 + R2.
Of course, this equation can be extend to any number of resistors in series, so that for N resistors
the equivalent resistance is given by
Req = Σ Ri (for i=1,2,3,...,N)
or
Req = R1 + R2 + R3 + ... + RN
In this experiment you will set up three circuits: one with resistors in series, one with resistors in
parallel, and one with some of each. You will be building circuits similar to the ones you will be
working with in homework and exam problems. This experiment should show you the difference
between resistors in series and parallel. If you understand what we are doing in this experiment,
you will be all set to do well on the midterm questions about circuits!
Equipment:
Resistors (R1 = 2.2 kΩ, R2 = 6.8 kΩ, and R3 = 4.7 kΩ), multimeter, and DC power supply.
Theory:
In the first part of this experiment we will study the properties of resistors, which are connected
“in series”. Figure 1 shows two resistors connected in series (a) and the equivalent circuit with
the two resistors replaced by an equivalent single resistor (b), as we discussed in the lecture.
Remember from lecture that, when resistors are connected in series, each one “sees” the same
current. Recall the water analogy: If you have two pipes that have different diameters but are
connected in series and you send water through them, each receives the same amount of water,
there are no branches into which the water can split. In lecture, we showed that the equivalent
resistance for resistors in series is
Req = R1 + R2.
Of course, this equation can be extend to any number of resistors in series, so that for N resistors
the equivalent resistance is given by
Req = Σ Ri (for i=1,2,3,...,N)
or
Req = R1 + R2 + R3 + ... + RN
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