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LED: A student wants to incorporate an LED into a circuit. She finds a bulb that says "11 mA at 4.7 V". She also finds some wire and a 10.4 V battery. She suspects (correctly) that the battery will fry the bulb. But she also finds a box with 1818 different resistors. W LED WA LED (a) (b) (a) The student designs a series circuit that will limit the current through the LED to 11 mA. What single resistor does she need? (b) Another student suggests using a parallel circuit instead. Find the single resistance that will limit the current through the bulb to 11 mA with this design, or explain why this design will not work.

LED: A student wants to incorporate an LED into a circuit. She finds a bulb that says "11 mA at 4.7 V". She also finds some wire and a 10.4 V battery. She suspects (correctly) that the battery will fry the bulb. But she also finds a box with 1818 different resistors. W LED WA LED (a) (b) (a) The student designs a series circuit that will limit the current through the LED to 11 mA. What single resistor does she need? (b) Another student suggests using a parallel circuit instead. Find the single resistance that will limit the current through the bulb to 11 mA with this design, or explain why this design will not work.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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LED: A student wants to incorporate an LED into a circuit. She finds a bulb that says "11 mA at 4.7 V". She also finds some wire and a 10.4 V battery. She suspects (correctly) that the battery will fry the bulb. But she also finds a box with 1818 different resistors. W LED W LED (a) (b) (a) The student designs a series circuit that will limit the current through the LED to 11 mA. What single resistor does she need? (b) Another student suggests using a parallel circuit instead. Find the single resistance that will limit the current through the bulb to 11 mA with this design, or explain why this design will not work.
Transcribed Image Text:LED: A student wants to incorporate an LED into a circuit. She finds a bulb that says "11 mA at 4.7 V". She also finds some wire and a 10.4 V battery. She suspects (correctly) that the battery will fry the bulb. But she also finds a box with 1818 different resistors. W LED W LED (a) (b) (a) The student designs a series circuit that will limit the current through the LED to 11 mA. What single resistor does she need? (b) Another student suggests using a parallel circuit instead. Find the single resistance that will limit the current through the bulb to 11 mA with this design, or explain why this design will not work.
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Current limiting resistors are generally connected in series with the elements to protect the elements from the damage due to high currents. 

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