What affects the magnitude of EMF?

What affects the magnitude of EMF?

The magnitude of the induced current depends on the rate of change of magnetic flux or the rate of cutting of the magnetic field lines.

What are the factors affecting the emf of a cell?

E.m.f. of a cell depends upon the material of electrodes and electrolyte used in the cell. It is independent of shape of electrodes, distance between electrodes and the amount of electrolyte.

What is good battery resistance?

Ideally, a battery should have 0Ω internal resistance. So during battery operation, all the voltage will be dropped across the element that the battery is powering instead of the battery dropping voltage across itself. According to voltage division, voltage drops across the element with the higher impedance.

How do you reduce the internal resistance of a battery?

Sulfation and grid corrosion are the main contributors to the rise of the internal resistance with lead acid. Temperature also affects the resistance; heat lowers it and cold raises it. Heating the battery will momentarily lower the internal resistance to provide extra runtime.

How do you test battery impedance?

In simple words – the impedance is determined by an application of an AC current signal, measuring the AC voltage drop across the battery and then calculating the impedance by use of the Ohm’s Law. As the battery gets older, the internal impedance increases.

What factors can contribute to internal resistance of a battery?

In practice, the internal resistance of a battery is dependent on its size, state of charge, chemical properties, age, temperature, and the discharge current.

Does the internal resistance of a battery change?

The internal resistance varies with the state-of-charge of the battery. The largest changes are noticeable on nickel-based batteries.

How do you increase internal resistance?

Internal resistance of a battery cell:

1. increases with increase in distance between two electrodes.
2. decreases with increase in concentration of electrolyte.
3. decreases with increase in area of the plate inside the electrolyte.
4. decreases with increase in size of the electrodes.