What is the correct value of RS in Fig. 8A7,...

Question 1 / 200JHk74nWukWX3wU46tVw

Question 1 of 200JHk74nWukWX3wU46tVw

What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?

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Question 1 of 20

0JHk74nWukWX3wU46tVw

What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?

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🔍 Key Concepts

• Ohm's Law: Relationship between voltage (V), current (I), and resistance (R) • How to find voltage drop across the resistor in a simple series LED circuit • Converting milliamps (mA) to amps (A) before doing the calculation

💭 Think About

• First, determine how much voltage is dropped across the resistor, given the supply voltage and the LED voltage drop • Then, use Ohm's Law to calculate the resistance needed for that voltage drop at the specified current • After calculating the resistance, compare your result to the answer choices to find the closest match

✅ Before You Answer

• Be sure you subtract the LED forward voltage (1.9 V) from the supply voltage (5 V) to get the resistor's voltage • Convert 40 milliamps to amps correctly before using Ohm's Law • Check that your final resistance value is in ohms, not kilo-ohms, and see which option matches your calculation

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Question 1 of 20

What is the correct value of RS in Fig. 8A7, if the voltage across the LED is 1.9 Volts with 5 Volts applied and If max equals 40 milliamps?

4,700 ohms.

155 ohms.

77 ohms.

10,000 ohms.

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