SERIES RESISTOR CIRCUIT
 THE EQUIVALENT SERIES RESISTANCE
1. We’ve made the following circuits to verify the math type of
the equivalent series resistance. The software that we’ve
used is called Electronics’ Work Bench
2. We have completed the following table from the indications
of the multimeter.
TABLE 1: resistance (ohm)
R1
R2
R3
Req
R1+R2+R3 (using a calculator)
50
100
150
300
300
3. Conclusion: We can find the equivalent resistance if we add
all the resistances of the circuit Req = R1+R2+R3
 THE CURRENT OF THE CIRCUIT
1. We’ve made the following circuit to verify that when we
connect resistors in a series circuit the current which flows
through each one of them it’s of the same value.
2. We’ve made the following circuit to verify that when we
connect resistors in a series circuit:
 We can find the source voltage: E = U1 + U2 + U3.
 The source voltage is divided in as many parts as the
number of the resistors in the circuit.
 We measure the greater part of the voltage on the
resistor with the greater value.
3. We have completed the following table from the indications
of the ammeter and the voltmeter.
TABLE 2: R, I, U in a series resistor circuit
Resistance R [Ω]
R1
50
R2
100
R3
150
Req
300
Current Ι[Α]
I1
0.04
I2
0.04
I3
0.04
Voltage U [V]
U1
2
U2
4
U3
6
E
12