Dr. J M D'Souza and Dr. Kirti J D'Souza Solutions for Exercise 5: EXERCISES
Dr. J M D'Souza Science Solutions for Exercise - Dr. J M D'Souza and Dr. Kirti J D'Souza Solutions for Exercise 5: EXERCISES
Attempt the free practice questions from Exercise 5: EXERCISES with hints and solutions to strengthen your understanding. EUREKA PLUS Revised Bringing Science to Life solutions are prepared by Experienced Embibe Experts.
Questions from Dr. J M D'Souza and Dr. Kirti J D'Souza Solutions for Exercise 5: EXERCISES with Hints & Solutions
Why are switches used in an electric circuit?
Why are electric wires covered with plastic?
What is the importance of a switch in an electric circuit?
Why are electric bulbs filled with argon gas?
Why are LEDs preferred than ordinary bulbs?
What is an electric circuit?
Study the diagram and describe in your own words how electricity produced in a power plant reaches your home.
Observe an electric cell. You will notice that there is a positive sign on the upper side. This sign is for the metal cap on the top. It is the positive terminal of the cell. The positive terminal is actually the carbon rod placed inside the cell. The metal cap is the tip of the carbon rod.
Now, look at the lower portion of the electric cell. You will find a negative sign. The metal disc at the bottom is the negative terminal of the cell. Every electric cell has a positive terminal and a negative terminal.
The cell is filled with certain chemicals. These chemicals react to produce electricity. An electric cell converts chemical energy into electrical energy. When the chemicals get used up, the cell stops producing electricity and the appliance working on it stops functioning. The electric cell then has to be replaced by a new cell.
Carefully read the description about the electric cell given and write a passage on 'Cell—a mini-power plant'.
