To find the resistors to be connected to the two LEDs that glow with different colors.
Answer to Problem 72A
Resistors of approximately
Explanation of Solution
Given data:
Supply voltage,
Current through each LED,
The current versus potential difference characteristic of the two LEDs
Formula used:
From ohm’s law:
Calculation:
As per problem
Supply voltage,
Current through each LED,
Consider two resistors
For the first LED,
Potential difference from the given graph is
Calculate resistance using the formula
Substitute the values
For the second LED,
Potential difference from the given graph is
Calculate resistance using the formula
Substitute the values
Resistors of approximately
Conclusion:
Thus,Resistors of approximately
Chapter 29 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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