EGR203 Electric and Electronic Circuits Assignment 5

  1. Determine the Thévenin voltage and resistance of the circuit below. Use the Thévenin equivalent circuit to determine the voltage across and current flowing through the load resistor.

    R1 (ohms)R2 (ohms)R3 (ohms) RL (ohms)Vs (volts)
    12040022060012

  2. Find the load resistance for maximum power transfer in the circuit above.

  3. Replace the load resistance in the circuit above with a 9 Volt battery. Find the current flowing through the battery. Is the battery being charged (power absorbed) or discharged (power generated)?

  4. Find the Thévenin voltage and resistance for the circuit below. Assume R = 90.

  5. The figure below shows a resistive load RL = 5 Ω connected to a Thévenin circuit with Vth = 20 V. For what value of Thévenin resistance is the power maximized? Find the maximum power delivered to the load. (Hint: Be careful, this is a trick question if you don't stop to think about it.)

  6. Find the voltage vc in the circuit below

  7. Given the following circuit, with

    R1R2R3R4R5 VaVb
    ohmsohmsohmsohmsohmsVoltsVolts
    16022018014090 12 12

    Solve for Vx, Vy, i1, i2, and i3 using either the node voltage or the mesh current method.

  8. Solve the above problem in Multisim. Attach a print-out of the circuit diagram showing probes measuring currents i1, i2, and i3 (be careful positioning the probes so that they measure the correct currents). Put your name on the circuit as a text annotation.

  9. Find the resistance between the points A and ground and between B and ground in the circuit below. Let R1 = 180 Ω, R2 = 120 Ω, and R3 = 240 Ω

Maintained by John Loomis, last updated 6 February 2013