Understanding Renewable Energy and Solar Cells

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What is the primary classification of energy?

Geothermal and Biomass

Renewable and Organic

Fossil and Non-fossil

Renewable and Non-renewable (correct)

What is a characteristic of renewable energy?

Limited in quantity

Accessible in abundance (correct)

Depletes in 50 years

Harmful to the atmosphere

What is a source of renewable energy?

Natural Gas

Oil

Coal

Wind (correct)

What is a characteristic of non-renewable energy?

Derived from limited-quantity sources Signup and view all the answers

What is an example of non-renewable energy?

Fossil fuels Signup and view all the answers

Why is cost a significant challenge in the growth of solar cells?

Due to the high production cost Signup and view all the answers

What happens to the concentration of holes on the p-type side as the concentration of electrons on the n-type side rises?

It rises Signup and view all the answers

What is the term used to describe the voltage generated by the p-n junction?

Photovoltage Signup and view all the answers

What causes the molecules in the core to migrate?

The continually changing flow direction of the alternating current Signup and view all the answers

What is the result of the molecules colliding with each other during their movement?

Friction and heat Signup and view all the answers

What is the primary material used in the manufacturing of solar cells and microchip transistors?

Silicon Signup and view all the answers

What is the characteristic of a semiconductor material like silicon?

It can be made to conduct electricity under certain conditions Signup and view all the answers

What is the term for the energy loss induced by the friction of molecules in the core?

Hysteresis loss Signup and view all the answers

What is the term used to describe the lower layer of silicon in a solar cell, which has a small number of electrons?

p-type silicon Signup and view all the answers

What is the response of certain solid materials to applied mechanical stress?

Electric charge accumulation Signup and view all the answers

What is the structure of a solar cell composed of?

Two layers of silicon Signup and view all the answers

What is the meaning of the word 'piezoelectricity'?

Electricity from pressure Signup and view all the answers

Which of the following materials is capable of exhibiting piezoelectricity?

Crystals Signup and view all the answers

What is a major limitation of piezoelectric generators in terms of power applications?

They produce limited power, making them unsuitable for high-power applications Signup and view all the answers

What factor influences the efficiency of energy conversion in piezoelectric generators?

The frequency and amplitude of the mechanical vibrations Signup and view all the answers

At what frequency do piezoelectric generators operate most efficiently?

A specific frequency that matches their resonant frequency Signup and view all the answers

What is the focus of ongoing research in piezoelectric generators?

Improving their efficiency and scalability Signup and view all the answers

What is a potential future application of piezoelectric generators?

Powering small electronic devices in remote or hard-to-reach locations Signup and view all the answers

What is essential for optimizing the performance of piezoelectric generators and exploring new possibilities in energy harvesting and electronic systems?

Understanding the principles and applications of piezoelectric generators Signup and view all the answers

What happens to the potential barrier across the semiconductor when the Fermi energy of metal becomes lower than the Fermi energy in the semiconductor?

It reduces Signup and view all the answers

What is the direction of the current generated across the MS junction when the applied voltage is increased?

Positive Signup and view all the answers

What happens to the depletion region when the applied voltage is continuously increased?

It becomes very thin and finally disappears Signup and view all the answers

What is the effect of forward biasing on the flow of electrons across the MS junction?

It increases the flow of electrons Signup and view all the answers

Why do more electrons diffuse from the semiconductor towards the metal than the electrons drifting into the semiconductor in forward biasing?

Because the potential barrier is reduced Signup and view all the answers

What is the condition for reverse biasing in an MS junction?

VA < 0 Signup and view all the answers