# I''What is the optimal resistance for maximizing battery terminal voltage?

• Alice7979
I'' + ?, where ? is the unknown resistance R. In summary, the terminal voltage of a battery with an emf of V and an internal resistance of r can be found by using the equation V=IR. When adding an external resistance R, the total resistance becomes Req=r+R. To find the value of R that will cause the terminal voltage to be ?, we can set up the equation V/2I'' + ? = Req and solve for R. The possible values for R are r, 4r, and r/4, as given in options A, B, and C.
Alice7979

## Homework Statement

A battery has an emf of V and an internal resistance of r. What resistance R, when connected across the terminals of this battery, will cause the terminal voltage of the battery to be
?
A. r= R
B. R= 4r
C. R= r/4

V=IR

## The Attempt at a Solution

Req= r+R
= V/I' + V/I''
= ? + V/2I''

Alice7979 said:
will cause the terminal voltage of the battery to be
?
The image did not appear to upload... Can you try again? Use the UPLOAD button to upload a PDF or JPEG image.

It was supposed to be V/2

## 1. What is resistance?

Resistance is a measure of how much a material or component opposes the flow of electric current. It is measured in ohms (Ω).

## 2. How do you calculate resistance?

Resistance is calculated using Ohm's law, which states that resistance (R) equals voltage (V) divided by current (I). In equation form, this is written as R = V/I.

## 3. What factors affect resistance?

The three main factors that affect resistance are the material of the circuit component, the length of the component, and the cross-sectional area of the component. Other factors may include temperature, the type of current (AC or DC), and the presence of other components in the circuit.

## 4. How does resistance impact a circuit?

Resistance impacts a circuit by reducing the flow of current and converting some of the electrical energy into heat. This can cause a decrease in the overall performance of the circuit and may lead to overheating or damage to components.

## 5. How can you measure resistance?

Resistance can be measured using a device called a multimeter. This device measures the voltage and current in a circuit and calculates the resistance using Ohm's law. Another way to measure resistance is by using a circuit simulator software, which can provide more accurate and precise results.

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