Renewable energy is the energy that is generated from the natural resources that can be replenished easily. Biogas is a renewable source of the energy from the given options.

Sources of energy which can be replenished quickly are renewable like hydel, wind etc.

Ocean current, producing ocean thermal energy, is a renewable source of energy.

Coal is non-renewable. Rest of all are renewable sources of energy.

Fossil fuels are non-renewable sources of energy among the following.

Electricity is movement of electrons across atoms.

Solar energy is renewable source of energy.  And Sun is the predominant source of energy. 

Reserve and Reservoir where we store them. Barrels are small containers where processed oil is packaged.

Water is a source of hydel energy.
Biomass helps to produce biogas in rural areas.
Thermal power plants produce electricity by burning of coal.
All of them are sources of energy and produce electricity.

Among the following biomass is a non renewable source of energy. 

These are different ranks of coal which is non renewable source of energy.

Magnets slowly lose their strength with time.

Energy efficiency measures how much of energy is put into device to do intended job. So, it is related to useful energy, heat and energy transformation.
$kW$ or kilowatts are unit used to measure amount of electric power.

Propane was formed millions of years ago by decay of dead tiny plants and animals that sank to the bottom of ocean. It is in limited in supply.

Wave energy requires devices to trap the energy. A wide variety of devices have been developed to trap wave energy for rotation of turbine and production of electricity.

Thermal power plants convert heat energy to electrical energy.

Electricity produced by flowing water is known as hydroelectric power.

Non renewable sources of energy are exhausted by natural human activities over a certain period of time.

Geothermal energy is renewable source of energy as it is unexhaustible.

Sequence of energy conversion is Heat energy $\rightarrow$ Mechanical energy $\rightarrow$ Electrical energy.

Solar energy, Nuclear energy, Wind energy, all are used for generating electricity.

Sources of energy can be classified as conventional/non-renewable or non-conventional/renewable sources of energy.

Dr Jami Hussain assessed wind energy potential in India to be about $2000\ GW$ in 2011.

Rotation of the turbine (mechanical energy) is used for the generation of electricity (electrical energy).

Advantages of the wind energy are as follows:

Coal, natural gas and petroleum forms the fossil fuels. Fossil fuels are non-renewable source of energy. Wind is a renewable source of energy.

Solar panels converts light energy to Electrical energy.

Cheaper and Renewable: Most of the Non-conventional Power resources are cheaper and renewable as compared to conventional source.Solar energy,wind energy are much cheaper than fuel,coal etc.

Solar constant is defined as the rate at which per unit area of the Earth's atmosphere receives the Sun's energy, when the Sun is at the mean distance from the Earth. Value is about 1388 watts per square metre.

Live storage of coal in power plants means sufficient storage of coal to meet 24 hour demand of the plant.

Water gas is produced from synthesis gas, which is composed of carbon monoxide and hydrogen

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. 

Steam coal also known as thermal coal, is used in power stations to generate electricity. Coal is first milled to a fine powder, which increases the surface area and allows it to burn more quickly

A Pulverized coal fired boiler is an industrial or utility boiler that generates thermal energy by burning pulverized coal (also known as powdered coal or coal dust since it is as fine as face powder in cosmetic makeup) that is blown into the firebox

 A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Therefore, wet streams enters the super heater of a boiler. 

The efficiency of a thermal power plant improves with use of high steam pressures.

 Specific volume is defined as the number of cubic meters occupied by one kilogram of a particular substance. When steam expands its volume increases hence its specific volume increases.

Unreliable supply is a disadvantage of most of renewable energy sources.

Electrostatic precipitators device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates and used to reduce air pollution due to smoke in power plants.