Checking Current in RL Circuit at t=0 - Typo Found?

  • Thread starter Thread starter marstery
  • Start date Start date
  • Tags Tags
    Example
Click For Summary
SUMMARY

The discussion centers on calculating the current through an inductor in an RL circuit at time t=0. The user identifies a discrepancy in the formula for the current, where the original calculation incorrectly uses the parallel resistance of 1k and 2k resistors as 2/3k, resulting in an incorrect current of 7.5 mA. The correct calculation should use 3/2k, yielding a current of 3.3 mA. This highlights the importance of accurately calculating parallel resistances in circuit analysis.

PREREQUISITES
  • Understanding of RL circuits and their behavior at t=0
  • Knowledge of parallel resistor combinations
  • Familiarity with Ohm's Law
  • Basic circuit analysis techniques
NEXT STEPS
  • Review calculations for parallel resistors in circuit analysis
  • Study the behavior of inductors in transient states
  • Learn about the application of Ohm's Law in RL circuits
  • Explore simulation tools for circuit analysis, such as LTspice
USEFUL FOR

Electrical engineering students, circuit designers, and hobbyists interested in understanding RL circuit behavior and improving their circuit analysis skills.

marstery
Messages
11
Reaction score
0
I have an example where a 5v dc source is connected to a 10mh inductor then to 1k and 2k resistors in parallel.

In finding the current through the inductor at t=0:

written is:
IL(0) = 5v / (2/3k) = 7.5 ma

what i got was:
IL(0) = 5v / (3/2k) = 3.3 ma

I'm just checking to make sure i haven't lost mind or missed something.
 
Physics news on Phys.org
The parallel combination of a 1k and 2k resistor is 1/(1+0.5) = 2/3. I think you just forgot the extra 1/ part?
 
right.
 

Similar threads

Engineering Open-circuit voltage in Thévenin equivalent
  • · Replies 4 ·
Replies
4
Views
3K
Engineering Find di/dt and dr/dt for a DC circuit with indepedent current source
  • · Replies 3 ·
Replies
3
Views
4K
Engineering Energy Dissipation by Inductor (RL circuit)
  • · Replies 1 ·
Replies
1
Views
12K
Engineering Find di(0+)/dt and dv(0+)/dt of circuit containing resistor, inductor
  • · Replies 3 ·
Replies
3
Views
3K
Engineering Find current in circuit (DC RL circuit with switch)
  • · Replies 10 ·
Replies
10
Views
2K
Engineering DC Steady State Circuit Analysis: Solving for iL, i, and Vc in a Simple Circuit
  • · Replies 14 ·
Replies
14
Views
4K
Engineering Finding Current in a Parallel RLC Circuit
  • · Replies 7 ·
Replies
7
Views
5K
Engineering Solve RL Circuit Problem: Homework Statement & Equations
  • · Replies 2 ·
Replies
2
Views
2K
Engineering Parallel RLC circuit initial values
  • · Replies 12 ·
Replies
12
Views
3K
Are the computed values in Load regulation correct?
  • · Replies 17 ·
Replies
17
Views
2K