A battery has emf 30.0 V and internal resistance r . A 9.00 Ωresistor is connected to the termi

step 1 Hi. In the given problem, EMF of the battery is E is equal to 30 volt. Its internal resistance i

A battery has emf 30.0 V and internal resistance r . A 9.00...

A battery has emf $30.0 \mathrm{~V}$ and internal resistance $r .$ A $9.00 \Omega$ resistor is connected to the terminals of the battery, and the voltage drop across the resistor is $27.0 \mathrm{~V}$. What is the internal resistance of the battery?

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Electromotive Force (EMF) and Terminal Voltage

This concept explains the idea that the EMF of a battery is the ideal voltage output when no current is drawn, while the terminal voltage is the voltage available to a connected circuit during operation. The difference between these two is due to the internal resistance of the battery, which causes a voltage drop when current flows.

Ohm's Law

Ohm's Law, summarized by the equation V = IR, is fundamental in relating voltage, current, and resistance in an electrical circuit. This law is critical for calculating the voltage drop across components such as resistors and understanding how current flows in circuits with both internal and external resistances.

Series Circuit Analysis

In series circuits, all components are connected along a single path such that the same current flows through each element. The overall resistance is the sum of the internal and external resistances. Recognizing that the internal resistance adds to the external resistance to affect the terminal voltage is a key aspect of analyzing such circuits.

Transcript

Please give Ace some feedback