Extra questions about electricity and circuits. Class 6
Answers
Explanation:
NCERT Extra Questions for Class 6 Science Chapter 12 Electricity and Circuits
Electric Cell
Question 1.
What is an electric cell?
Answer:
Electric cell is a source of energy. It produces a small amount of electricity from chemicals stored inside it.
Question 2.
What is meant by a battery?
Answer:
When two or more cells are joined together, it is called a battery.
Question 3.
Give any difference between a cell and a battery.
Answer:
A cell has only one plate as a positive and only one plate as a negative electrode, while a battery, which is a combination of cells in a series, can have many plates.
Question 4.
Why does a cell stop producing electricity after some time?
Answer:
An electric cell produces electricity from chemicals stored inside it. When the chemicals inside the cell are used up, the cell stops producing electricity.
Question 5.
Why should we not join the wires connected to the two terminals of the electric cell?
Answer:
We should never join the wires with two terminals of the electric cell. If we do so, the chemicals in the electric cell get used up very fast and the cell stops working.
Question 6.
Name some devices in which we use an electric cell.
Answer:
We use electric cell in an alarm clock, wrist watch, transistor, camera, torch, etc.
Question 7.
Two cells can be joined in two ways in series and in parallel. What do you mean by these two ways? In which way the cells are joined in a torch?
Answer:
In series: When (+) terminal of one cell is joined to (-) terminal of the other, the arrangement is called in series.
Parallel: When (+) terminal of a cell is joined to (+) terminal and (-) terminal to (-) terminal of other cell, the arrangement is called parallel.
Question 8.
Why shouldn’t the two terminals of an electric cell be joined directly?
Answer:
Never join the two terminals of the electric cell without connecting them through a switch and a device like a bulb: Because if you do so, the chemicals in the electric cell get used up very fast and the cell stops working.