What is the voltage across "R1" of figure...

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Question 1 of 2066636ef128f7522a1c523349

What is the voltage across "R1" of figure "B" of the illustrated circuit with the switch closed if the applied voltage is 24 volts and resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms, respectively? Illustration EL-0020

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Question 1 of 20

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🔍 Key Concepts

• Series circuit: how current and voltage behave when resistors are in series • Total resistance of R1, R2, and R3 combined • Using Ohm’s Law (V = I × R) to find the voltage drop across one resistor in a series string

💭 Think About

• Are R1, R2, and R3 in series or parallel in figure B when the switch is closed? What does that tell you about the current through each resistor? • Once you know the total resistance of the circuit, how can you find the circuit current from the 24‑volt source? • After finding the current, how can you use it with R1’s resistance to get the voltage across R1?

✅ Before You Answer

• Be sure you correctly add all series resistances (R1 + R2 + R3) before finding current • Confirm that the same current flows through every resistor in a simple series circuit • Compute the voltage across R1 using V_R1 = I × R1 and compare your result to the multiple‑choice options

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