With the negative probe connected to ground, measure and record the following voltages, in reference to ground: • High potential side of D1 - This will give you the voltage across the entire series. Expected value is about 5V. · Between D1 and R1 (you can use the low side of D1 or the high side of R1, since the readings will be the same). Expected value is about 3.3V because the forward voltage of D1 is about 1.7V, leaving 3.3V for the rest of the components in the series. • Between R1 and D2. This will give you the forward voltage of D2 in this series. Expected value is about 2.8V. ince you know the voltage in reference to ground at each point in the series, you can also easily determine the voltage across any individual component. The ground eferenced voltage on the high side of the component, minus the voltage on the low side of that component, will tell you the voltage across the component. You can onfirm the answer by measuring the voltage directly across the component, which should be very close to the same value. The meter rounds values up or down a ttle, so the numbers may not always match exactly, but they should be very close. You will need the voltage across R1 (with D1 and D2 both lit) for the assignment. WARNING: If, at any point in this assignment, the voltage across R1 is zero while the circuit is turned on, this means the resistor has been shorted and you risk burning out D1 or damaging D2. Make sure R1 is not shorted.

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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In step 2 you measured the voltage across each of the LEDs. This is their “forward voltage” that is referred to in the LED component page, which is the voltage required to light the LEDs. Notice that the combined forward voltage of D1 and D2 is greater than 3.3V, the LEDs will not light up at all. You should also have noticed that the forward voltage for one of the LEDS is lower than the forward voltage for the other LED. Some LEDS require less energy to light than others. Since D1 and D2 are in series, the same current will flow through each, but the different voltages across each LED reflect the different energy requirements. Finish each statement below, bears on this information and in the measurements you took in step 2 The measured forward voltage across D1 in this step is ________ The measured forward voltage across D2 in this step is ________

STEP 2
With the negative probe connected to ground, measure and record the following voltages, in reference to ground:
• High potential side of D1 - This will give you the voltage across the entire series. Expected value is about 5V.
• Between D1 and R1 (you can use the low side of D1 or the high side of R1, since the readings will be the same). Expected value is about 3.3V because the forward
voltage of D1 is about 1.7V, leaving 3.3V for the rest of the components in the series.
• Between R1 and D2. This will give you the forward voltage of D2 in this series. Expected value is about 2.8V.
Since you know the voltage in reference to ground at each point in the series, you can also easily determine the voltage across any individual component. The ground
referenced voltage on the high side of the component, minus the voltage on the low side of that component, will tell you the voltage across the component. You can
confirm the answer by measuring the voltage directly across the component, which should be very close to the same value. The meter rounds values up or down a
little, so the numbers may not always match exactly, but they should be very close.
• You will need the voltage across R1 (with D1 and D2 both lit) for the assignment.
WARNING: If, at any point in this assignment, the voltage across R1 is zero while the circuit is turned on, this means the resistor has been
shorted and you risk burning out D1 or damaging D2. Make sure R1 is not shorted.

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