Heat transfer is the transmission of heat energy from a body at higher temperature to lower temperature. The three mechanisms of heat transfer areConduction ConvectionRadiation.
Example of Conduction:
Heating a metal
Example of Convection:
Example of Radiation:
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Transmission of heat is the movement of thermal energy from one thing to another thing of different temperature.
There are three(3) different ways heat can transfer and they are:
a) Conduction (through direct contact).
b) Convection (through fluid movement).
c) Radiation (through electromagnetic waves).
Examples: 1.Heating a saucepan of water using a coalpot.(conduction&convection).
2. Baking a pie in an oven(radiation).Hope it helps!!Please mark me as the brainliest!!!
A. the transfer of heat by currents
Explanation: There are three modes of heat transfer:
1) Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.
2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.
3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space. Example: Heating of earth's surface.
B. The transmission of heat across matter is conduction.
C. The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation.
D. The transmission of heat across empty space is radiation.
Option (D) is the correct answer.
When heat or energy is transferred through the space in the form of waves or through a material medium then it is know as radiation.
For example, when we take Sun bath then our body gets warm due to solar radiation.
For transfer of heat through radiation it is not necessary that the objects have to in contact with each other.
Thus, we can conclude that out of the given options, the transmission of heat without any contact.
Given parameters are:
L = 143 km
I = 500 A
So, we will find the voltage potential provided for the city as:
Then, we will find dissipated power because of the resistive loss on the transmission line as:
Since the charge of plant is not given for electric energy, let's assume it randomly as
Then, we will find the price of energy transmitted to the city as:
To calculate money per hour saved by increasing the electric potential of the power plant:
The amount of money saved per hour = $/hr
Note: For different value of the price of energy, it just can be substituted in the equations above, and proper result can be found accordingly.
A: The transfer of heat by currents.
Convection is the transfer of heat by currents, typically within a liquid or a gas. When heat is transferred by convection, matter flows.
B. the transmission of heat across matter
C. the transmission of heat through a medium without the motion of the medium
Conduction occurs in the three states of matter namely : solid, liquid and gas. Heat is meant to flow from a hotter surface to a cold surface and it takes place by direct contact of the two surfaces.
Objects with high temperature usually have high movement and vibration and these movements and vibration propagates the heat energy to the surrounding molecules. This form of heat propagation ensures there is no motion of the heat medium.
Reduce sound transmission.
A caulking is a flexible material used to seal joints, cracks or gaps formed between building materials and pipes against leakage.
Caulking is recommended around the edges of partitions between apartments to reduce sound transmission.
Hence, in the event that an individual notices that air or sound is gaining entrance into their apartment, a caulking can be used to mitigate this noise or unwanted sound.
The caulking when applied to the gap or edges of partitions between apartments would create a tight seal and block the flow or entry of air, thereby reducing sound transmission.
The answer is D
Because Conduction is always transmission