physics 2

Question 1

What does the term ‘energy dissipation’ mean?

Answer 1

describe ways in which energy is wasted.

Question 2

State how you would reduce energy dissipation in each of these situations

Answer 2

Reduce Vdd / switching activity / clock frequency

Question 3

What is the relationship between how thick the insulation in the walls of a house is and how quickly heat is lost

Answer 3

thickness of 585mm. insulation thickness 10 - 80 mm - temperature differences 20 - 180 deg C

Question 4

State two equations that can be used to find efficiency

Answer 4

Turnover of Receivables. Repayment of Liabilities Ratio.

Question 5

State 4 non-renewable sources of energy generation

Answer 5

1 Coal.
2 Oil.
3 Natural gas.
4 Nuclear power.

Question 6

State 7 types of renewable energy generation

Answer 6

Hydroelectric
Solar
Wind
Geothermal
Ocean
Hydrogen
Biomass

Question 7

Give two advantages and two disadvantages of using coal fired power stations

Answer 7

advantages: It’s abundant and easy to burn. It’s safer than other plants like the nuclear power plant.
disadvantages: Greenhouse Gas mining destruction

Question 8

Give two advantages and two disadvantages of wind electricity generation

Answer 8

advantages: Renewable energy Water is freely available Plenty of resources available for up to
disadvantages: on-renewable energy Discharges harmful High cost of designing and building nucl

Question 9

Give two advantages and two disadvantages of nuclear energy generation

Answer 9

advantages: Nuclear energy provides an enormous capacity. We can reuse the fuel from nuclear energy projects
disadvantages: There is always the threat of an accident when working with nuclear energy There is a waste issue to consider with nuclear energy

Question 10

Give two advantages and two disadvantages of solar energy generation

Answer 10

advantages: Sustainability Impact on Economy Growth
disadvantages: Weather Dependent. Uses a Lot of Space.