Explore BrainMass

Explore BrainMass

    Kirchhoff's Voltage Law

    Kirchhoff’s Voltage Law states that the total voltage around a closed loop must be zero. This is the result of the electrostatic field being conserved. If Kirchhoff’s Law were not true, then we would travel around a closed loop and the voltage would be indefinite.

    ∑V = 0

    The Kirchhoff’s voltage equation is obtained by traversing a circuit loop in either direction and writing down unchanged the voltage of each element whose “+” terminal is entered first and writing down a negative of every element’s voltage where the minus sign is met. The loop must state and end at the same point however it does not matter where you start on the loop.

    The current direction must be assumed. The assumed current creates a voltage across each resistor and fixes the position of the positive and minute signs so that the passive sign convention is obeyed. The assumed current direction and polarity of the voltage across each resistor must be in agreement with the passive sign convention for the analysis to work. 

    © BrainMass Inc. brainmass.com March 30, 2023, 5:49 pm ad1c9bdddf

    BrainMass Solutions Available for Instant Download

    Circuit Theory

    Please review the below questions and give fully worked out answers and explainations where appropriate so it can assist in my further understanding of electrical and electronic circuit theory for complex simultaneous equations, mesh analysis, and Kirchoffs Laws.

    Analysis of AM circuit

    A third year engineering student is designing a modulating circuit in a simulator. The completed schematic is shown in Figure Q4. When he simulates the output, the circuit seems to be working fully. He now takes a demodulating circuit which he has successfully designed and tested previously on a similar modulator and finds that

    Limiting Value of the Charge

    A circuit contains an electromotive force [E(t)], a capacitor with capacitance of C Farads, and a resistor with a resistance of R ohms. The voltage drop across the capacitor is Q/C where Q is the charge in Coulombs, so Kirchoff's Law gives R * I + Q/C = E(t) But I = dQ/dt, so R * dQ/dt + 1/C * Q = E(t) If the resista

    current in RL circuit..

    An electric circuit with an ohmic resistor R and an inductance L will exhibit a certain delay in approaching the (asymptotic) saturation current I_infinity=U/R in response to a voltage source U. Using Kirchoff's circuit laws, electrical engineers have proposed the equation dI/dt=-R/L I+U/L for describing the time dependence I(

    LC Circuit With A Battery

    There is a LC circuit with a battery with emf (E). The battery is connected in series with the inductor and the capacitor. At t=0 the charge of the capacitor is Q and the current in the circuit is 0. a) Draw the circuit and put the battery wherever you want. b) Write the 2nd law of Kirchhoff for the circuit. c) Find the cha


    Please show as much working as possible and comment where possible. Please refer to attached diagrams for complete questions and mentioned figures. 1. The diagram below shows an autotransformer represented as two separate inductors, L1 and L2, magnetically coupled with a coupling coefficient k. a) Apply Kirchhoff's volta

    Apply Kirchhoff's voltage law to the input and output circuits

    Please refer to the attachment for the mentioned figures. FIGURE 6(a) shows a particular type of transformer, called an autotransformer. The autotransformer has just one winding that has three electrical connection points called taps. One tap forms a common connection that is connected to both the source and the load. In an a

    Unknown voltages and currents.

    Please see the attached file - Do I use Kirchhoffs law - I get confused between that and Ohms law and when I need to apply Kirchhoffs.

    Electrical Circuit Problem

    Given the following Electrical Circuit, which statement below is true? 1. The voltage across R3 equals the battery voltage 2. The current through R2 is greater than the current through R1. 3. The current through R1 equals the current through R3. 4. The voltage across R5 equals the voltage across R4. 5. The current throug

    Applying Kirchoff's Laws

    The diagram of the circuit in the attached file is composed of two batteries (e1 = 9 V and e2 = 6 V) and four resistors (R1 = 110 ohm, R2 = 40 ohm, R3 = 50 ohm, and R4 = 50 ohm) as shown. (a) What is the current I1 which flows through R1? (b) What is the current I3 that flows through R3? Because of the presence of batte

    Charge Passes Through the Circuit

    1. The current flowing through a circuit is i(t)= 4t+3 A. How much charge passes through the circuit element between 0 and 2 seconds? 2. Three circuit elements are joined at a node in a circuit. Two amps are flowing into the node from one element, and seven amps are leaving the node and flowing into the element two. How many

    Electric Circuit Calculations

    Calculate v1 v2 v3 and i1 i2 and 13 if Vs=8v and R1=560 ohms, R2=330 ohms, R3=820 ohms, R4=1000 ohms, R5= 4.7k ohms. See attached file for full problem description.

    KCL and Ohm's Law

    (I have attached a picture of the problem.) With reference to Problem 2.7, use Kirchoff's current law and Ohm's law to find the resistances R1, R2, R3, R4, and R5 if R0=2 ohms. Assume R4=(2/3)R1 and R2=(1/3)R1. Problem 2.7 was about finding the currents using Kirchoff's current law knowing that i0=2A, i1=-4A, iS=8A and Vs

    Charge, Current, Potential Difference

    In the attached circuit diagram: 1) Find the magnitude of the charge in the upper branch. 2) Find the magnitude of the current in the middle branch. 3) Find the magnitude of the current in the lower branch. 4) What is the potential difference V_ab of point a relative to point b?

    Current, voltage, power

    Please see attached. Need assistance with problems 6 and 2 showing all equations used and all math used, symbols, numbers etc and do each step by step. Adult learning here! Thanks! Questions: (1) How much energy does a 100 W electric bulb consume in 2 hours? (2) A store element draws 15 A when connected to a 130 V line.

    Circuits and currents: In series, in parallel for battery connection

    1. You connect a number of identical light bulbs to a flashlight battery. What happens to the brightness of each bulb as more bulb as more bulbs are added to the circuit if you connect them in a) series; b) parallel? Will the battery last longer if the bulbs are in series or parallel? 2. In a two-cell flashlight, the batteri

    Kirchoff's Law Calculations

    Please see attached. Numerical Answer is included in attachment I really need to see the step by step process to solve this problem. Draw the diagram of the loop used for each equation. Have fun... Thanks P.S. Scanned answers are acceptable, please write legibly. Find the linear system of equations using Kirchoff's la

    Relative Brightness in a Circuit, and using Modified Kirchhoff

    Help with questions 8.2 and 8.9. Please see attached file for full problem descriptions. 8.2) Explaining the relative brightness in the given circuit. 8.9) Use the modified version of Kirchhoff's second rule to find the voltage across the bulb in the given circuit.

    Circuitry Problems

    1) In the following circuit, all bulbs are identical. The voltage drop across bulb A is 10.0 volts A) Rank the bulbs in terms of brightness, starting with the brightest. B) Find the voltage between points 1 and 2. State: "the voltage at point 1 is ________ volts relative to point 2." (In other words, if I use my voltmeter, c

    Kirchoff's Law with Potential Difference, Current and Resistors

    See the attached file. With using Kirchoff's law equations, find potential difference and current for each resistor. First find the relationship between potential difference and current, and then find the specific values. Refer to diagram for resistor layout. R1=5 (ohm) (All is in OHM) R2=9650 R3=550 r4=995 r5 13730

    Triangular Factorization : Kirchoff's Voltage Law

    4. Kirchhoff's voltage law says that the sum of the voltage drops around any closed path in the network in a given direction is zero. When this principle is applied to the circuit shown in Figure 3.5, we obtain the following linear system of equations: (R1+R3+R4)I1+ R3I2+ R4I3=E1 (1) R311 + (R2 + R3 + R5)12 ? R513 = R411 ? R5

    Circuit Elements - Voltage and Power

    A) Find the currents ... b) Find the voltage ... c) Verify that the total power developed ... Please see attachment for complete question and diagram.

    Circuit Elements - Power

    Find (a), (b) and (c) the power delivered by the independent current source Please see the attachment for the complete question and diagram. Thanks.

    Simple Circuits Examples

    M4. Solve problems in simple circuits with one voltage source and parallel/series combinations of restrictive loads. Task 1. a) State Ohm's Law b) State Kirchoff's current Law. c) State Kirchoff's voltage Law. Please see attached.

    Circuit Calculation

    For the attached circuit, find Vx, I1, and I2. a) Vx=5V, I1=0.5A, I2=0.5A b) Vx=10V, I1=0.5A, I2=1A c) Vx=2.5V, I1=0.75A, I2=0.25A d) Vx=7.5V, I1=0.25A, I2=0.75A