Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process (see the 1ˢ? law of thermodynamics).
This process increases the flow of oxygen and nutrients to the muscles, helping to heal the damaged tissue. Heat stimulates the sensory receptors in the skin, which means that applying heat to the lower back will decrease transmissions of pain signals to the brain and partially relieve the discomfort.
Geothermal heat pumps can operate in any climate—hot or cold—because of the earth's constant underground temperature (from 45° to 75° F depending on location). In fact, millions of GHP systems are already heating and cooling homes and businesses worldwide, and that includes all 50 U.S. states.
It also helps reduce global warming and pollution and requires far less land than a coal mine or oil field. The only environmental disadvantage is the occasional release of harmful gases. Since thermal power operates by drilling into the Earth's mantle, some poisonous gases can escape.
In fact, the University of Melbourne Energy Institute and the Alternative Technology Association reported that using a heat pump could save you as much as $1,700 per year. This extreme savings amount has a lot to with rising gas prices, falling electricity prices, and more efficient heat pump technology.
Whilst thermal power plants give out a lot of gases that are harmful to the environment, they also give out what is known as thermal pollution. Thermal pollution is the degradation of the local environment, in particular the localized waterways, that are changed by the discharge of waste water from the power plant.
Disadvantages of geothermal energy
- Environmental issues. There is an abundance of greenhouse gases below the surface of the earth.
- Surface instability (earthquakes) Construction of geothermal power plants can affect the stability of land.
- Expensive.
- Location specific.
- Sustainability issues.
The disadvantages of geothermal energy are mainly high initial capital costs. The cost of drilling wells to the geothermal reservoir is quite expensive. Taking into account the cost of heating and cooling system installation thereby surging extra costs.
The heating effect of electric current is widely used in our day-to-day life. When an electric current is passed through a conductor, it generates heat due to the hindrance caused by the conductor to the flowing current. The work done in overcoming the hindrance to the current generates heat in that conductor.
Joule's law of heating states that when a current 'i ' passes through a conductor of resistance 'r' for time 't' then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time. H = i 2 rt.
Joule's Law DefinitionJoule's law, when an electric current passes through a conductor, heat H is produced, which is directly proportional to the resistance R of the conductor, the time t for which the current flows, and to the square of the magnitude of current I. Mathematically it is represented as H ∝ I² .
To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in
The heating effect of an electric current depends on three factors:
- The resistance, R of the conductor. A higher resistance produces more heat.
- The time, t for which current flows. The longer the time the larger the amount of heat produced.
- The amount of current, I.
Electricity can be used to heat either storage or continuous flow water heaters, and can also be used as a booster to solar or heat pump water heating systems. The advantage of electricity is its reliable supply.
Electric Current: The flow of electric charge is known as electric current. Electric current is carried by moving electrons through a conductor. Electric current is expressed by the rate of flow of electric charges. Rate of flow means the amount of charge flowing through a particular area in unit time.
Electric current, any movement of electric charge carriers, such as subatomic charged particles (e.g., electrons having negative charge, protons having positive charge), ions (atoms that have lost or gained one or more electrons), or holes (electron deficiencies that may be thought of as positive particles).
When electric current is supplied to a purely resistive conductor, the energy of electric current is dissipated entirely in the form of heat and as a result, resistor gets heated. The heating of resistor because of dissipation of electrical energy is commonly known as Heating Effect of Electric Current.
1 : loss or damage especially to reputation, credit, or finances : detriment the deal worked to their disadvantage. 2a : an unfavorable, inferior, or prejudicial condition we were at a disadvantage.
is that disadvantage is a weakness or undesirable characteristic; a con while advantage is any condition, circumstance, opportunity or means, particularly favorable to success, or to any desired end.
Advantages and Limitations of Planning
- Attention on Objectives: Planning helps in clearly laying down objectives of the organization.
- Minimizing Uncertainties: ADVERTISEMENTS:
- Better Utilization of Resources:
- Economy in Operations:
- Better Co-ordination:
- Encourages Innovations and Creativity:
- Management by Exception Possible:
- Facilitates Control:
Ten Disadvantages of Online Courses
- Online courses require more time than on-campus classes.
- Online courses make it easier to procrastinate.
- Online courses require good time-management skills.
- Online courses may create a sense of isolation.
- Online courses allow you to be more independent.
Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches.
What is another word for advantages and disadvantages?
| pros and cons | fors and againsts |
|---|
| boon and bane | costs and benefits |
Advantages and disadvantages of using email
- Emails are delivered extremely fast when compared to traditional post.
- Emails can be sent 24 hours a day, 365 days a year.
- Webmail means emails can be sent and received from any computer, anywhere in the world, that has an internet connection .
- Cheap - when using broadband , each email sent is effectively free.
Disadvantages of government intervention
- Government failure. Government failure is a term to describe how government intervention can cause its own problems.
- Lack of incentives.
- Political pressure groups.
- Less choice.
- Impact of personal freedom.
1. Communication - Speed / time – money can be saved because it's much quicker to move information around. With the help of ICT it has become quicker and more efficient.
With no burning materials, combustible gases, or noxious fumes, electric heating is the safest possible heating solution for your home. Most methods of electrical heating have no moving parts, which means that there is less chance of the system breaking down, so your heating system will last for a long time.
Ans: The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element, it becomes too hot and glows red. But the resistance of cord which is usually of copper or aluminium is very law so it does not glow.
Answer: An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. Electric charge is carried by charged particles, so an electric current is a flow of charged particles.
The advantage of a parallel connection of an electrical device with a battery is
- There is no division of voltage among the appliances when connected in parallel.
- The total effective resistance of the circuit can be reduced by connecting electrical appliances in parallel.
