# Terminal Voltages of a flashlight cell?

• carnivalcougar
In summary, when a 6V battery is connected in series with a 1.5V flashlight cell, the available terminal voltages are ≤1.5V, 7.5V, and 4.5V. These are the only voltages possible when connecting the batteries in series.
carnivalcougar

## Homework Statement

A 6V battery us connected in series with a 1.5V flashlight cell. What possible terminal voltages are available?

V = emf-Ir

## The Attempt at a Solution

If the flashlight cell is 1.5V, then I think that it will burn out at voltages above 1.5V. So the available terminal voltages are ≤1.5V

The question is worded a bit ambiguously, but I think I know what they mean.

In your attempt at the solution, you assumed that BOTH pairs of terminals were connected. I think they are asking what would happen if ONE pair of terminals were touching.

What the question really means is: You wish to power some devices from a couple of dry cell batteries you have. You can power a 6v gadget from the 6v cell, and a 1.5v gadget from the 1.5v cell. But if you join the two cells in series it's possible to obtain additional voltages, not just the 6v and 1.5v, so you can power other gadgets that require different voltages. What additional voltages can you obtain by powering some gadget using these batteries connected in series?

Ohhh... I don't see why they couldn't just say a 6V battery and a 1.5V battery. If they were in series, you could have 7.5V. You can also get 4.5V by running the 1.5V battery against the 6V battery. Are these two voltages the only voltages possible when connecting them in series?

carnivalcougar said:
Ohhh... I don't see why they couldn't just say a 6V battery and a 1.5V battery. If they were in series, you could have 7.5V. You can also get 4.5V by running the 1.5V battery against the 6V battery. Are these two voltages the only voltages possible when connecting them in series?
If you have only one of each, that's what you can achieve. Correct.

1 person

## 1. What is the terminal voltage of a flashlight cell?

The terminal voltage of a flashlight cell refers to the potential difference between the positive and negative terminals of the cell when it is connected to a circuit.

## 2. How is the terminal voltage of a flashlight cell measured?

The terminal voltage of a flashlight cell can be measured using a voltmeter, which is connected to the positive and negative terminals of the cell.

## 3. What factors affect the terminal voltage of a flashlight cell?

The terminal voltage of a flashlight cell can be affected by factors such as the type of chemical reaction happening within the cell, the materials used for the electrodes, and the temperature of the cell.

## 4. Why does the terminal voltage of a flashlight cell decrease over time?

The terminal voltage of a flashlight cell decreases over time due to the depletion of the reactants and the buildup of reaction byproducts, both of which can affect the chemical reactions happening within the cell.

## 5. Can the terminal voltage of a flashlight cell be increased?

The terminal voltage of a flashlight cell cannot be increased, as it is determined by the chemical reactions happening within the cell. However, using multiple cells in a series can increase the overall voltage of a circuit.

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