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This unit is called the joule in honour of James Joule (1818—89) who did much early research in the area of work and the related of energy. A bulb in a desk lamp can convert electrical energy into heat and light at the rate of 40 joules per second; a bulb in a floodlight can convert electrical energy into heat and light at the rate of 500 joules per second.
A builder brings 1000 blocks each of mass 20 kg from the ground, up a ladder, to the top of a house.
POTENTIAL ENERGY: Potential energy is the energy a body has due to its position in a force field. ELECTROMAGNETIC ENERGY: This is the energy transmitted from one point to another in the form of electromagnetic waves that travel at the speed of light. INTERNAL ENERGY  or heat energy: The molecules of every substance, whether solid, liquid or gas are in perpetual motion.
CHEMICAL ENERGY: The energy given out (or sometimes taken in) in the form of heat, light or kinetic energy during a chemical reaction is called chemical energy. ELECTRICAL ENERGY When an electric current flows in a metal wire subatomic particles called electrons move in the wire. NUCLEAR ENERGY The energy given out from the nuclei of certain atoms during nuclear reactions (fission or fusion for example) is called nuclear energy.
Energy cannot be created or destroyed but can only be transferred from one body to another or changed from one form to another. Energy is said to be renewable if the source of the energy is still there after energy is taken from it, and non-renewable if  the source of the energy is gone after energy is taken from it.
The store water behind an enormous dam flows through the intake and into a pipe called a penstock. The electrical generator (Alternator) produces electricity with a voltage of about 20000 volts.
If we want to transfer high power from the electric plant to the town where it can be used, we need high Voltage and Current ( Amps )values.
Remember that Amps mean electrons moving through conductors which, because of their collisions with atoms, produce heat. The cables of transmission lines are made of aluminium ( cheaper ) or copper ( more expansive ) because they have a low resistance. A changing current in the primary winding generates an alternating magnetic field in  the ferromagnetic material. There is a relationship between voltage and electric field, so if a voltage is applied in the primary winding with 10 turns it generates a Magnetic field of value X , the same magnetic field generates a voltage in the secondary winding. Blade: the arm of a propeller or other similar rotary mechanism, such as an electric fan or turbine.


Core: The piece of iron,  or other ferrous material forming the central  portion in an transformer . Hydropower is a clean, renewable and reliable energy source which converts kinetic energy from falling water into electricity, without consuming more water than is produced by nature. Quite simply the oldest method by which renewable energy has been harnessed by the human race.
The potential energy stored in a body of water held at a given height is converted to kinetic energy (movement energy) which is used to turn a turbine and create electricity. In either instance, the water flows through a pipe, or penstock, then pushes against and turns blades in a turbine to spin a generator to produce electricity. In order to generate electricity from the kinetic energy in moving water, the water has to be moving with sufficient speed and volume to turn a generator. Hydroelectric generation can also work without dams, in a process known as diversion, or run-of-the-river. There is currently more than 90 GW of pumped storage capacity worldwide, with about one-quarter of that in the United States. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
In the picture shown to the below, Jiabo (the stick man) is holding a poorly drawn ball above the ground.
The amount of work done depends on the force exerted and the distance through which the force acts. If heat is supplied to a substance, the motion (the vibration) of its molecules increases as its temperature rises. As sound travels through a substance, the vibration from the source is passed on from molecule to molecule in that substance. For example, when something is burned, some of the chemical energy stored in it is changed into heat and light energy. In every chemical or physical reaction, there is no net gain or loss of energy; any loss is always accompanied by an equal gain.
Examples of renewable energy sources are wind energy and  solar energy, hydroelectric energy, wave energy and biomass. A problem with renewable energy sources is generating enough reliable energy to meet all our requirements.
They are usually easier to get energy from and store, but have a bigger environmental impact. The intake remains closed when no energy is asked for, for example, at night, as everybody is in bed.


Because the bird only touches one line, so electrons flow through the path of least resistance, the wire, and not its body. The first water wheels were used well over 2000 years ago, and the technology has since been refined to become very efficient in the production of electricity. In a run-of-the-river system, the force of the current applies the needed pressure, while in a storage system, water is accumulated in reservoirs created by dams, then released when the demand for electricity is high. Roughly speaking, one gallon of water per second falling one hundred feet can generate one kilowatt of electrical power. When water behind a dam is released, it runs through a pipe called a penstock, and is delivered to the turbine.
Portions of water from fast-flowing rivers, often at or near waterfalls, can be diverted through a penstock to a turbine set in the river or off to the side.
In a pumped storage plant, water is pumped from a lower reservoir to a higher reservoir during off-peak times, using electricity generated from other types of energy sources. When the man starts to roll down the hill, He is losing potential energy, and is gaining kinetic energy.
A lot of research is being done to find practical ways of using these ‘altemative’ sources for the future.
Meanwhile, the reservoirs or lakes are used for boating and fishing, and often the rivers beyond the dams provide opportunities for whitewater rafting and kayaking.
It only has potential gravitational energy, as it is off the ground suspended in the air, yet not moving.
Even though the man and the crane do the same work  the crane does it in a much shorter time. The turbine spins and its shaft is connected to a generator that changes the mechanical spinning energy into electrical energy ( electricity ). I mean,  they change the very high voltage electricity back into lower voltage electricity. Another run-of-the-river design uses a traditional water wheel on a floating platform to capture the kinetic force of the moving river. Inevitably, some power is lost, but pumped storage systems can be up to 80 percent efficient.



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