10 Questions
What are the main disadvantages of Li-ion batteries mentioned in the text?
The main disadvantages mentioned are: 1) They are expensive, 2) They are not available in standard cell types, 3) Electrolyte breakdown into flammable gases by overheating.
List three applications of Li-ion batteries given in the text.
The applications mentioned are: 1) Cameras, calculators, smartphones and consumer electronics, 2) Cardiac pacemakers and implantable devices, 3) Electric vehicles like cars, aircraft, wheelchairs, models etc.
What is the basic principle behind the working of a fuel cell?
The basic principle of fuel cells is identical to electrochemical cells, where chemical energy from a fuel-oxidation system is converted into electrical energy.
How does a fuel cell differ from a conventional electrochemical cell?
In a fuel cell, the chemical energy is provided by a fuel and an oxidant stored outside the cell, which are continuously and separately supplied to the electrodes.
What is the key advantage of a fuel cell over a conventional battery?
Fuel cells are capable of supplying current as long as the outside supply of fuel is maintained.
Give two examples of fuel-oxidant systems used in fuel cells mentioned in the text.
The examples given are: 1) H2-O2 fuel cell, 2) Methanol-O2 fuel cell
Express the overall reaction occurring in a fuel cell in a balanced chemical equation.
Fuel + oxygen → Oxidation products + Electricity
Why are Li-ion batteries preferred for powering electric vehicles?
Li-ion batteries are preferred because of their light-weight.
What are some power tool applications of Li-ion batteries listed?
Cordless drills, sanders, saws, and garden equipment like whipper-snippers and hedge trimmers.
Name the electric vehicle that used Li-ion batteries mentioned in the text.
The Mars Curiosity rover
Learn about the classification of fuels as solid, liquid, or gaseous, and understand the concept of calorific value which represents the total heat released when a unit mass of fuel is completely burnt. Explore different types of artificial or secondary fuels derived from primary fuels such as charcoal, coke, kerosene oil, and more.
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