Ans. It is the most commonly used cell and used in calculators, torches, toys, flashlights, portable radios, cameras, hearing aids etc.
Ans. The electrical contacts of an electric cell or a battery or any other electronic device are known as terminals.
Ans. Dry cell is an electric cell in which the chemicals are made into a paste so that they cannot easily spill from their container.
Ans. A solar cell is an electrical device that converts the solar energy directly into electricity.
Ans. An electric cell is a device that produces electricity from the chemicals stored inside it.
Ans. A cell is a single unit which converts chemical energy into electrical energy whereas a battery is a collection of cells.
Ans. Electric cell are used in torch, alarm clocks, wristwatches, transistor radios, cameras and many other devices.
Ans. Rubber and plastics are used for covering electrical wires because they are insulators and do not allow electric current to pass when we touch them.
Ans. An electric circuit diagram indicates the arrangement of different circuit elements with their conventional symbols.
Ans. Electrical insulators may be used for circuit boards, switches, coating on electric wire and cable, handles of screw driver and tester etc.
Ans. In an electric circuit keep the terminals unconnected. Since the bulb does not glow when there is only air in the gap, it means that air is also an insulator.
Ans. The different sources of electric current are:
i. Primary cells
ii. Secondary cells or accumulators
iii. Power house
Ans. The electric circuit provides a closed path for electricity to pass between the two terminals of the electric cell. The bulb glows only when current flows through the circuit.
Ans. Human body is a good conductor of electricity and may get shock. To prevent themselves from electric shock, electrician wears rubber gloves while repairing electric switches.
Ans. An electric circuit mainly consists of electric devices (such as computer, light bulb), switching devices, source of electricity (such as battery), etc. that are connected by conducting wires.
Ans. The bulb of tester would glow only if the object conducts electricity. Since, bulb glows when tester touches the object, object must be a conductor.
Ans. Electricity can flow through conductors but not insulators. In the following activity, we used aluminum foil which is a conductor, hence bulb will glow.
Download to practice offline.