Energy

Question 1

Energy

Answer 1

Energy: is the capacity for doing work, where work can be described
by the product of force and the displacement

Question 2

One calorie

Answer 2

One calorie (cal) is the amount of energy required to raise the
temperature of one gram of water from 14.5oC to 15.5oC
1 cal = 4.186 J

Question 3

Power

Answer 3

Power: is the rate of doing work

Question 4

Forms of energy

Answer 4

Potential energy (due to elevation)
Kinetic energy (due to velocity)
Chemical energy
Heat energy

Question 5

Heat energy

Answer 5

Heat energy is analyzed by energy balances because the quantity of
heat energy in a material is simply its mass times its absolute
temperature.
Heat energy = Mass of material x Absolute temperature of the material

Question 6

ENERGY SOURCES AND AVAILABILITY

Answer 6

Renewable energy sources:
Hydropower from rivers
Hydropower from tidal estuaries
Solar power
Refuse and other waste materials
Wind
Wood and other biomass

Nonrenewable energy sources:
Nuclear power
Coal
Natural gas
Oil

Question 7

Heating Value

Answer 7

Heating value: the energy per unit mass of fuel

Question 8

Thermal Power Plant

Answer 8

1. Fuel is burned in a firing chamber
2. Water circulating through the boiler tubing is converted to high-pressure, hightemperature stream
3. 10% losses occur due to incomplete combustion and loss of heat up the
   smokestack
4. The steam enters a steam turbine
5. The high-pressure steam expands, causing a shaft of the generator to spin
6. The generator converts the rotational energy into electrical power which goes
   out into transmission lines of distribution
7. The steam changes back to the liquid state as it is cooled in the
   condenser