Internal resistance refers to the opposition to the flow of current offered by the cells and batteries themselves resulting in the generation of heat. Internal resistance is measured in Ohms.

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## What are the factors on which internal resistance of cell depends Class 12 project?

(i) distance between the plates (electrodes) (ii) common area of the electrodes immersed in the electrolyte and (iii) concentration of the electrolyte.

## On which the internal resistance EMF of a cell depends?

The internal resistance of a cell depends on: Surface area of electrodes (more surface area โ less resistance) Distance between the electrodes (more distance โ more resistance) Nature and concentration of electrolyte (higher concentration โ more resistance)

## How do you find the internal resistance of an experiment?

## What is the formula for internal resistance?

V=IR, according to Ohm’s Law. The letters V, I, and R stand for voltage, current, and resistance, in this case, internal resistance. Ans. The following is the formula for calculating resistance using Ohm’s Law: R = V I, where R denotes the resistor’s resistance in ohms and V denotes the voltage drop in volts.

## Is internal resistance positive or negative?

The maximum current is called the short circuit current, I S C . To find the internal resistance of the cell the gradient of the line is calculated. This has a negative value.

## What are the 4 factors that increase resistance?

- The type of material of which the resistor is made.
- The length of the resistor.
- The thickness of the resistor.
- The temperature of the conductor.

## What are the 4 factors that affect resistance?

- Resistance is proportional to length.
- Resistance is inversely proportional to cross-sectional-area.
- Resistance depends on the material the wire is made of.
- Resistance increases with the temperature of the wire.

## What are the 3 factors that affect resistance?

length – longer wires have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.

## Which cell has lowest internal resistance?

EXPLANATIONโฆ Secondary cells offer the lowest internal resistance when new and are mostly rechargeable.

## Which type of cell has high internal resistance?

Primary cells have high internal resistance while secondary cells have low internal resistance.

## What factors affect internal resistance?

Internal resistance of a cell depends upon the following factors: The surface area of the electrodes: Larger the surface area of the electrodes, less is the internal resistance. The distance between the electrodes: More the distance between the electrodes, greater is the internal resistance.

## What is the SI unit of internal resistance?

The SI unit of electric resistance is the ohm (ฮฉ).

## What is the internal resistance of a 1.5 V battery?

We would normally expect an AA cell to have an EMF of about 1.5 V and an internal resistance of about 1 ฮฉ.

## What is the value of internal resistance?

For ideal cell the voltage drop across internal resistance should be zero. Thus the internal resistance will be zero.

## Who discovered internal resistance?

Georg Ohm’s Discoveries In two important papers in 1826, Ohm gave a mathematical description of conduction in circuits modelled on Fourier’s study of heat conduction.

## What is the unit for EMF?

It is commonly measured in units of volts, equivalent in the metreโkilogramโsecond system to one joule per coulomb of electric charge. In the electrostatic units of the centimetreโgramโsecond system, the unit of electromotive force is the statvolt, or one erg per electrostatic unit of charge.

## What is EMF of a cell?

The emf of a cell is the sum of the electric potential differences (PDs) produced by a separation of charges (electrons or ions) that can occur at each phase boundary (or interface) in the cell. The magnitude of each PD depends on the chemical nature of the two contacting phases.

## Is internal resistance important?

Internal resistance is one of the parameters that indicate a battery’s ability to carry current. When the value of internal resistance is low, the battery is able to carry a significant amount of current. On the other hand, a battery with high internal resistance can only carry a small amount of current.

## What is the symbol for internal resistance?

We use the symbol r to denote internal resistance and it is often drawn as a small resistor inside the voltage supply.

## What is current formula?

Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.

## What are the 5 types of resistance?

- Passive change resistance.
- Active change resistance.
- Attachment change resistance.
- Uncertainty change resistance.
- Overload change resistance.

## Does temperature affect resistance?

If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously. This increases the number of collisions between the free electrons and the ions. Hence, for a metal, resistance increases with increasing temperature. Often the increase in temperature is caused by an increase in current.

## What causes resistance?

An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

## What is the unit of current?

The ampere, symbol A, is the SI unit of electric current.