# When a dry cell is connected across a bulb?

## When a dry cell is connected across a bulb?

When a dry cell is connected across a bulb and the circuit is switched on, then the brigthness of bulb goes on decreasing . Explain. emf of the cell ε-V++V- is the difference of chemical potentials of electrodes, which is constant for a given cell and is independent of time of use.

### What makes an electric bulb light when dry cell?

When the two terminals of a cell are connected to the two terminals of a torch bulb by using wires, the electric current passes through the filament of the bulb and it starts glowing. The torch bulb lights up when its metal tip and metal case are connected to a cell through wires.

#### Why the bulb connected to two dry cells is brighter?

 The current is higher for two dry cells as compared to one dry cell.  The bulb glows brighter when another dry cell was added to the circuit and reading on voltmeter increases.  The voltage is bigger for two dry cells as compared to one dry cell.  As the voltage increases, the current also increases.

How many terminals are there in a dry cell?

two terminals
Looking at any battery, there are generally two terminals. One terminal is marked (+), or positive, while the other is marked (-), or negative.

What is the difference between a cell and a battery?

A cell is known as a single unit device that converts electrical energy to chemical energy, while a battery is a group of different cells. A cell can be either of wet, dry, fuel or reserve type depending on the kind of electrolytes used, while a battery is either rechargeable or non-rechargeable.

## How would you connect a wire between a battery and bulb so that the bulb will light up?

Tape one end of the other wire to the top, or positive, terminal of the battery. Tape the other end of the wire to the bottom of the light bulb stem. When you connect the two wires to the light bulb, it will light up [source: Dave].

### Why do bulbs have two terminals Class 6?

The bulbs have two terminals because, a circuit can be completed only when there are both the positive terminal as well as the negative terminal, as the current flow is allowed only when the circuit is complete. Hence, the bulb has two terminals.

#### How are cells connected to a torch bulb?

Connect another dry cell in series to the earlier one connected to the torch bulb. Here, connect the negative terminal of the first cell to the positive terminal of the second cell by a connecting wire. The negative terminal of the second cell is now connected to the other terminal of the bulb. Once the connection is made glows.

How are cells and bulbs in series and parallel?

Observe that the terminal B of the first bulb is connected to terminal A of the second bulb and terminal B of the second bulb is connected to terminal A of the third bulb. Such a combination of bulbs is called the series combination. Series connection in bulbs is very much similar to that in cells.

How are light bulbs connected in a circuit?

In an electric circuit, bulbs are said to be connected in series, if the second terminal of one bulb is connected to the first terminal of the next bulb and so on. When bulbs are connected in series, the same amount of current passes through them. But, the EMF offered by the source of electricity is divided among them.

## What happens when bulbs are connected in series?

When bulbs are connected in series, the same amount of current passes through them. But, the EMF offered by the source of electricity is divided among them. As the number of bulbs in the combination with the same source of electricity increases, the brightness of each of the bulb decreases compared to that of a single bulb in the circuit.