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I think melting, condensation and Sublimination.

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Q: What three phase changes require the addition of heat?
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What phase changes require the subtraction of heat energy?

Phase changes requiring the addition of heat energy are the phase changes from solid to liquid, liquid to gas, and solid to gas. These phase changes are termed melting (solid to liquid), evaporation (liquid to gas), and sublimation (solid to gas).


Does a two phase heater need a two phase thermostat?

Most electrical equipment are either designed to work on Single phase (two wires) or Three Phase (three or four wires). Two phase equipment are non existent today. A single phase heater will require a single phase thermostat while a three phase heater will require a three phase thermostat.


What is it called when the three states change?

changes of state are called phase changes.


What changes of state require energy?

Sublimation, melting, and vaporization are three changes of state which require energy.


How do you use a one phase motor in place of a three phase motor?

To use a single/one phase motor instead of a three phase motor is possible if you have a three phase power supply as you will only need to tap one of the three phases together with neutral and an earthwire, however to use a three phase motor instead of a single phase will require the provision of three phase power supply.


Condition of three phase in which there is no need of neutral?

A delta-connected system is described as being a three-phase, three-wire, system, and doesn't have a neutral. But a balanced star (wye) connected load (e.g. a three-phase induction motor) doesn't actually require a neutral.


Why you use three phase supply in experiment of power factor of RL series circuit?

You don't necessarily. For a straightforward series (or parallel) R-L load, you will only require a single-phase supply. However, if you had three R-L loads, connected in delta or star (wye), then you would require a three-phase supply.


How is three phase power useful to consumers?

Three phase power is always delivering power on one of the phase continuously. This is very useful to manufacturing industries to operate the machines, which require high power utilization.


What does 3 phase converters mean?

A three phase converts changes an element into into three phases or state. The weather is natural three phas converter. It can alternate water into solid, liquid, or gas.


What are the three phase changes?

The 3 types of endothermic phase changes are the movement from solid to liquid, the movement from liquid to gas, and the movement form gas to plasma. Endothermic is the absorbing of heat.


What are three things that happen during glycolysis?

There is: G1, G2, and S. In the phase G1: Enters Cell. In the phase G2: Trapped in Cell. IN the phase S: Changes into acid.


What transformer do you need if you have primary voltage of 600 3 phase and require 240 volt 1 phase?

A single phase 600 to 240 Volt transformer using two phases of the three phase primary.