In the illustrated circuit in figure "A",...

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Question 1 of 205eccefa3bacbc34ba4d47fa6

In the illustrated circuit in figure "A", the voltage is provided by a 12 Volt lead acid battery and the resistor value is 3 ohms. When the switch is closed, if the battery is rated for 120 amp-hours, how long will it take before the voltage will drop to 1.75 volts per cell? See illustration EL-0018.

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🔍 Key Concepts

• Use Ohm's Law to find the current drawn by a 3-ohm resistor from a 12-volt source • Understand what amp-hours (Ah) mean in terms of current over time • A 12-volt lead-acid battery has 6 cells; relate 1.75 volts per cell to the total battery voltage

💭 Think About

• First, calculate the circuit current once the switch is closed; what is I if V = 12 V and R = 3 Ω? • Given the battery is rated at 120 amp-hours, how long can it theoretically supply that current before reaching its discharge point? • Convert your final time from hours into days where needed so you can compare to all the answer choices

✅ Before You Answer

• Be sure you are using total battery voltage (all cells together), not voltage per cell, when you apply Ohm's Law • Verify that you interpret 120 amp-hours as current × time: Ah = A × h • After finding hours, convert units carefully to days for any choices expressed in days

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