To find the resistor to be connected to the two LEDs,if connected in series.
Answer to Problem 73A
A resistor of approximately
Explanation of Solution
Given data:
Supply voltage,
Desired current through,
Potential drop across first LED,
Potential drop across second LED,
Formula used:
From ohm’s law:
Calculation:
As per problem
Supply voltage,
Potential drop across first LED,
Potential drop across second LED,
The voltage drop across the two LEDs combines is
Rearrange the stated formula for
Substitute the values
A resistor of approximately
Conclusion:
Thus, a resistor of approximately
Chapter 29 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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Physics: Principles with Applications
Essential University Physics: Volume 2 (3rd Edition)
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