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2.7: Exercises

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    (Assume diodes are silicon unless stated otherwise)

    2.7.1: Analysis Problems

    1. For the circuit of Figure \(\PageIndex{1}\) determine the circulating current if the supply is 6 volts and the resistor is 10 k\(\Omega\).

    clipboard_e46c608349b710d69d8cf51b0a649cc7f.png

    Figure \(\PageIndex{1}\)

    2. Repeat Problem 1 if the diode is inserted in the opposite orientation.

    3. Given the circuit of Figure \(\PageIndex{2}\), determine the voltage drops across the resistors. The source is 12 volts, \(R_1\) = 4.7 k and \(R_2\) = 3.3 k.

    clipboard_e67ac7bd68c2a43b061fd0d820d8544a7.png

    Figure \(\PageIndex{2}\)

    4. In Figure \(\PageIndex{3}\) determine the voltage drops across the resistors.

    clipboard_eeb3e209be2504480078e654dac274e71.png

    Figure \(\PageIndex{3}\)

    5. Determine the LED current in Figure \(\PageIndex{4}\). Assume the LED barrier is 2.1 volts, the source is 5 volts and the resistor is 330 \(\Omega\).

    clipboard_e443d3115d59f3dfdb95e1e6fb73318b1.png

    Figure \(\PageIndex{4}\)

    6. Repeat Problem 5 if the LED is inserted in reverse orientation.

    7. Determine the resistor currents in Figure \(\PageIndex{5}\). The source is 15 volts, \(R_1\) = 8.2 k and \(R_2\) = 3.9 k.

    clipboard_ed507b1206533147b2f51e7963ed1204a.png

    Figure \(\PageIndex{5}\)

    8. For the circuit of Figure \(\PageIndex{6}\), determine the resistor voltage. The source is 9 volts, the Zener potential is 5.1 volts and the resistor is 1 k.

    clipboard_ed9d6bd28ddae15bd956df83512df386f.png

    Figure \(\PageIndex{6}\)

    9. For the circuit of Figure \(\PageIndex{7}\), determine the resistor voltage. The source is 8 volts, the Zener potential is 3.3 volts and the resistor is 10 k.

    clipboard_ee3e2fec3e01d1a0369a5a4bbca981e26.png

    Figure \(\PageIndex{7}\)

    10. Determine the voltage across \(R_2\) in Figure \(\PageIndex{8}\) if the source is 9 volts, the Zener is 6.8 volts, \(R_1\) = 5.1 k and \(R_2\) = 33 k.

    clipboard_eb03cfd875af0b2542b254a2f463f958c.png

    Figure \(\PageIndex{8}\)

    2.7.2: Challenge Problems

    11. Determine the resistor voltage in Figure \(\PageIndex{9}\) if \(E_1\) = 5 volts, \(E_2\) = 9 volts and \(R\)= 1 k.

    clipboard_e6f95b6860f5f4d6338b4509f142f502c.png

    Figure \(\PageIndex{9}\)

    12. Determine the voltage across \(R_2\) in Figure \(\PageIndex{8}\) if the source is 9 volts, the Zener is 5.6 volts, \(R_1\) = 5.1 k and \(R_2\) = 3.9 k.

    2.7.3: Design Problems

    13. Determine a value for \(R\) in Figure \(\PageIndex{1}\) to set the current to 10 mA if the source is 5 volts.

    14. Determine a value for \(R\) in Figure \(\PageIndex{4}\) that will set the LED current to approximately 20 mA if the source is 9 volts and the LED is a standard red type. Use a standard resistor value.

    2.7.4: Computer Simulation Problems

    15. Simulate Problem 9.

    16. Simulate the circuit designed in Problem 14 for verification.

    This page titled 2.7: Exercises is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James M. Fiore via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.