# Why the terminal potential difference of a battery decrease when the current drawn from it is increased?

## Why the terminal potential difference of a battery decrease when the current drawn from it is increased?

For a given emf and internal resistance, the terminal voltage decreases as the current increases due to the potential drop Ir of the internal resistance.

### What happens to the terminal potential difference when current drawn from the cell increases?

On increasing the current drawn from a cell, the potential difference of its terminlas is lowered. We know that terminal potential difference V=ε-Ir . If I is increased, V will be lowered.

Why does the terminal PD drop when the battery supplies a current?

When no current is flowing the terminal potential difference is equal to EMF of the cell. If a current is flowing then the terminal potential difference of cell will be lower than its EMF, as some loss of energy takes place inside the cell due to its internal resistance.

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What is terminal potential difference?

Terminal potential difference of a cell is defined as the potential difference between the two electrodes of a cell in a closed circuit. The value of terminal potential difference of a cell is less than the emf of a cell, when current is drawn from the cell (i.e., during discahrging of cell).

## Does higher potential difference mean higher current?

The greater the rate of charge transport (current) the greater the kinetic energy of the charge. A higher voltage means more work is done per unit charge by the voltage in moving it between the two points, thereby delivering more kinetic energy per unit charge to overcome resistance. That translates to higher current.

### Can the terminal potential difference of a cell exceed its emf?

Yes, when cell itself is being charged, because terminal potential difference, V=ε-(-Ir)=ε+Ir.

Why does increasing Pd increase current?

The difference in electric potential energy (per charge) between two points is what we have given the name voltage. Thus, the voltage directly tells us which way charges want to move – and if they can, then they will speed up in that direction, so the current will increase.

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What is the difference between terminal potential difference and potential difference?

Terminal voltage is the potential difference across the terminals when the circuit is switched on. The value of the terminal voltage is always lower than that of EMF due to the potential drop that occurs due to the current that passes through the internal resistance of the cell.

## How does the terminal potential of a battery change with current?

Thus, terminal p.d of a battery decreases when the current drawn from it is increased. Where, E is the emf of the battery, r is the internal resistance of battery, and I.r is the potential difference across internal resistance. When I increased then I.r becomes larger and terminal potential becomes small.

### What happens when we draw more current from a battery?

Where, E is the emf of the battery, r is the internal resistance of battery, and I.r is the potential difference across internal resistance. When I increased then I.r becomes larger and terminal potential becomes small. Thus, we can say that when we draw more current from battery then its terminal potential difference will decrease.

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What is the meaning of terminal voltage?

Terminal Voltage: Terminal Voltage of a cell or battery is the potential difference build between the two terminals of the cell/battery or load when a load is connected to the cell or battery or when a current is being drawn from the cell or battery.

Why is the terminal voltage of a cell/battery smaller than EMF?

Due to the internal resistance of a cell/battery some EMF is used to overcome the resistance so the terminal voltage of a cell or battery is always smaller than it’s EMF. The terminal voltage of a cell/battery depends on the EMF of the cell/battery, Internal resistance and the load resistance.