POE Unit 1.3 Key Terms

Convection

• Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.

• The process by which energy is transmitted through a medium, including empty space, as electromagnetic waves. This energy travels at the speed of light. This is also referred to as electromagnetic radiation.

• The process separating the hydrogen-oxygen bond in water using an electrical current.

Ohm

• The unit of electric current in the meter-kilogram-second system of units. Symbolized as Ω.

• The measure of resistance to heat flow.

• The unit of potential difference symbolized as V.

Conduction

• The transfer of heat within an object or between objects by molecular activity, without any net external motion.

• The process by which energy is transmitted through a medium, including empty space, as electromagnetic waves. This energy travels at the speed of light. This is also referred to as electromagnetic radiation.

• Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.

Passive Solar Energy Collection

• Systems that do not make use of any externally powered, moving parts, such as circulation pumps, to move heated water or air.

• The study of the effects of work, heat, and energy on a system.

• A type of system that uses circulating pumps and fans to collect and distribute heat.

Entropy

• The function of the state of a thermodynamic system whose change in any differential reversible process is equal to the heat absorbed by the system from its surroundings divided by the absolute temperature of the system.

• The opposition that a device or material offers to the flow of direct current.

• Energy in transit due to a temperature difference between the source from which the energy is coming and a sink toward which the energy is going.

U-value

• A measure of thermal transmittance through a material.

• The measure of resistance to heat flow.

• The flow of electrical power or charge.

R-value

• The measure of resistance to heat flow.

• A measure of thermal transmittance through a material.

• The unit of electric current in the meter-kilogram-second system of units. Referred to as amp and symbolized as A.

Electrolysis

• The process separating the hydrogen-oxygen bond in water using an electrical current.

• Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.

• The process by which energy is transmitted through a medium, including empty space, as electromagnetic waves. This energy travels at the speed of light. This is also referred to as electromagnetic radiation.

Voltage

• The potential difference measured in volts. The amount of work to be done to move a charge from one point to another along an electric circuit.

• The flow of electrical power or charge.

• Energy in transit due to a temperature difference between the source from which the energy is coming and a sink toward which the energy is going. Resistance

Heat

• Energy in transit due to a temperature difference between the source from which the energy is coming and a sink toward which the energy is going.

• The ability to do work.

• The flow of electrical power or charge.