Describing the relationship between effort and energy with reference to a turbine
[LO 1.2, 2.1, 3.2]
Energy is necessary for any performance of work. This energy must be obtained from FUELS or from CONVERTED forms.
CONSTRUCTING A SIMPLE TURBINE
Use a tin lid, cut it into segments to form it into a fan and make a hole in the centre.
Nail the fan to a piece of wood.
Boil water in a kettle, until there is a strong draught of steam.
Hold the fan in position so that the jet of steam will be directed towards its centre.
QUESTIONS
1. What happened?
2. What kind of energy conversion occurred?
3. Describe the form of energy conversion that occurs with wind towers such as those that have recently been erected along the West Coast in the vicinity of Malmesbury.
4. What advantages do wind towers like these have for the environment?
Write a paragraph (60 words) about the value that the principle of the turbine has for people.
WORK is also measured in (give the name of the unit) .…………....................................
Activity 2
Discussing other machines that operate by means of conversion of energy
THE MICROSCOPE
As long ago as the early 17
th century, Robert Hook assumed that light rays have energy and that a wound-up spring has potential energy. He also constructed the first microscope and was the first person to use the universal lever, which is used in a wide range of instruments and cars.
SATELLITES
Satellites depend on solar panels to absorb light energy from the sun and supply electricity for all other electronic functions and for cameras and radio equipment. Energy is also stored in chemical form in rechargeable batteries.
WIND PUMPS
The blades of the rotary disk are turned by the wind to drive a pump that pumps underground water to a storage dam.
Assignment 3: GROUP DISCUSSION
Name at least three other machines that operate by means of energy conversion and explain the workings of each one.
WHEN IS A MACHINE MECHANICALLY INEFFECTIVE?
When a machine or appliance fails to provide an adequate quantity of the energy that it has been designed to provide we say that it is in affective.
The light bulb, for instance, releases (unwanted) heat, but was actually designed to provide light!
In this instance, fluorescent lighting is more effective and economical.
Are you able to list further examples?
Assessment
LO 2
Scientific KnowledgeThe learner will know and be able to interpret and apply scientific, technological and environmental knowledge.
This is displayed when the learner:
2.1 is able to recall meaningful information;
2.2 is able to arrange information according to categories;
2.3 is able to interpret information;
2.4 is able to apply knowledge.
LO 3
Science, Environment and the CommunityThe learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.
This is displayed when the learner:
3.1 is able to show appreciation of science as a human endeavour;
3.2 is able to recognise the value of sustainable utilisation of resources.
Memorandum
Activity 1
Questions:
1. The fan (‘turbine’) rotates
2. Chemical to steam to kinetic / mechanical
3. Kinetic to electrical to chemical
4. Natural resources (e.g. coal) are not used and pollution is avoided
Paragraph:
E.g. natural energy is converted to usable energy
Without consumption of resources
Without pollution
There are no waste products to be got rid of
Examples of utilising turbines: generation of electricity, previously also for driving mills
Effort is measured in Joule
Activity 2
Any power generator
Compressor
Vehicle engine
Sewing machine
Kitchen appliances
Etc.
Ineffective machines: any machine or system that releases energy in a non-usable form, e.g. a car that is driven with the hand break on (much energy is wasted in the attempt to overcome the force of friction – energy in the form of heat goes to waste).
Questions & Answers
differentiate between demand and supply
giving examples
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
When MP₁ becomes negative, TP start to decline.
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
ok
Shukri
how do you save a country economic situation when it's falling apart
Economic growth as an increase in the production and consumption of goods and services within an economy.but
Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has
The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50.
A,Calculate quantities of x and y which maximize utility.
B,Calculate value of Lagrange multiplier.
C,Calculate quantities of X and Y consumed with a given price.
D,alculate optimum level of output .
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
