DC Circuits Question (internal resistance)

In summary, the conversation discusses determining the magnitudes and directions of the currents through R1 and R2 in a given circuit. The values for R1 and R2 are provided, along with the voltages for V1 and V3. The use of Kirchof's Voltage Law is suggested as a helpful tool for solving the problem.
  • #1
KierstenKudos
1
0

Homework Statement



Determine the magnitudes and directions of the currents through R1 and R2 in Fig. 19-47, where R1 = 37 and R2 = 16 .

Figure 19-47
(image attached)

V1 = 9.0 V
V3 = 6.0 V
R1 = 37 [tex]\Omega[/tex]
R2 = 16 [tex]\Omega[/tex]

Homework Equations



V = IR

The Attempt at a Solution



V = IR
6.0 V = (37[tex]\Omega[/tex]) I
.16216 A = I [tex]_{}1[/tex](correct)

V = IR
6.0 = (16[tex]\Omega[/tex]) I
.375 A = I[tex]_{}2[/tex] (incorrect)
 

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  • #2
KierstenKudos said:

The Attempt at a Solution



V = IR
6.0 V = (37[tex]\Omega[/tex]) I
.16216 A = I [tex]_{}1[/tex](correct)

V = IR
6.0 = (16[tex]\Omega[/tex]) I
.375 A = I[tex]_{}2[/tex] (incorrect)
That's weird, I would say I1 is incorrect and I2 is correct. Did you get the 16Ω and 37Ω values reversed perhaps?

Kirchof's Voltage Law (KVL) would be useful here.
 

Related to DC Circuits Question (internal resistance)

1. What is internal resistance in a DC circuit?

Internal resistance is the inherent resistance within a source of electrical energy, such as a battery, that limits the flow of current through the circuit.

2. How does internal resistance affect the performance of a DC circuit?

Internal resistance can cause a voltage drop within the circuit, which can decrease the overall voltage and current output. This can lead to a decrease in the efficiency and performance of the circuit.

3. How is internal resistance measured in a DC circuit?

Internal resistance can be measured by using a multimeter to measure the voltage across the terminals of the source without any load, and then measuring the voltage again with a load connected. The difference between the two values can be used to calculate the internal resistance.

4. What factors can affect the internal resistance in a DC circuit?

The internal resistance of a source can vary based on factors such as the type of material used in the source, the size and shape of the source, and the temperature of the source. Additionally, the internal resistance can also be affected by the load connected to the circuit.

5. How can internal resistance be minimized in a DC circuit?

To minimize internal resistance, it is important to choose a source with a low internal resistance and to use thicker wires with lower resistance. Additionally, keeping the source and the load at similar temperatures can also help to reduce internal resistance in a circuit.

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