Technical data

35
eries Circuits
etecting a Short in a Series Circuit
roject Objective:
To provide experience with the changes that occur when a short develops in a series circuit.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 47k & 2 - 10k
ake sure power supply is off when connecting meters or changing circuit components.
xperiment
S
D
P
It
M
E
1. Connect the initial circuit as shown in Figure 14-1.
_____________________
_____________
individual voltage drops.
I = __________________________
_________
rease, decrease) _______________________
to (increase, decrease ________________.
ops across the unshorted resistors in th irc
. The resistance of the simulated short
e, since V = I x R, th olt
ircuit will essentially equal
_____________. We
circuit, the
crease, decrease)
____________________ e, decrease) ____________________; the
oltage drop across the unshorted
R will ( ease, decrease) ____________________;
rease, decrease) ______________________;
2. Adjust the V
A
to 15 volts. Measure and record the current and
individual voltage drops.
I
T
= __________________________
V = ________
1
_________________
V
2
= ____
V = _________ ___
3
3. Simulate a resistor “shorting out” by removing R
3
and
replacing it with a jumper wire. Measure and record the circuit
current and
T
V
1
= __________________________
V
2
= _________________
V
3
(across short) = _________________
Shorting out R
3
caused the circuit R
T
to (inc
to _____________ ohms. This caused I
T
) __
The new current value caused the voltage dr e c uit to
(
increase, decrease) _______________________
(jumper wire) is essentially _____________ ohms. Therefor e v age
drop across the shorted resistor of a series c
can conclude that if there is a short in any part of a series R
T
will (in
_ ; I
T
will (increas
incrv
he shorted R will (incand the voltage across t
to
____________.
mA
V
A
10k
10k
47k

R
1
+
R
2
R
3
Figure 14-1