From the course: Electronics Foundations: Basic Circuits

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Solution: Camera flash

Solution: Camera flash

From the course: Electronics Foundations: Basic Circuits

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Solution: Camera flash

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- This was my thought process for solving the challenge. I began by considering the first requirement, to select a resistor value that would charge the capacitor as quickly as possible while also limiting the amount of current from the battery to be 15 milliamps or less. I know that the voltage across the resistor will change as the capacitor charges. Initially, when the voltage across the capacitor is zero, the resistor will have 9 volts across it. Then as the capacitor charges and its voltage increases, the voltage across the resistor will decrease until it reaches zero. Since the largest voltage across the resistor will be 9 volts, I used Ohm's Law to find a resistor value that would allow a current of 15 milliamps, which gave me a resistance of 600 ohms. That's not a standard resistor value so I rounded up to 680 ohms because I have a resistor with that value in my box of parts. Substituting that back into Ohm's Law…

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