What is the output voltage of a 3.0000-V lithium cell in a digital wristwatch that draws 0.300

step 1 So if we're given a cell that has an EMF of 3 volts, and we know the current that's drawn is 0 .

What is the output voltage of a 3.0000-V lithium cell in a...

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Key Concepts

Internal Resistance

Internal resistance refers to the inherent opposition within a battery that causes a voltage drop when current flows. It is modeled as a resistor in series with an ideal voltage source and determines how much the battery's terminal voltage will drop under load.

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuits stating that the voltage drop (V) across a resistor is equal to the product of the current (I) flowing through it and its resistance (R), i.e., V = IR. This concept is critical for calculating the voltage loss in a battery's internal resistance.

Terminal Voltage Under Load

Terminal voltage under load is the effective voltage available from a battery when a device is drawing current. It is determined by subtracting the voltage drop (caused by the internal resistance as per Ohm's Law) from the battery's nominal voltage.

Load Current

Load current is the amount of current drawn by a device from a battery. Even relatively small currents can cause a notable voltage drop across the battery's internal resistance, affecting the terminal voltage available to the device.

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