Which is a characteristic of a step–down transformer?

Answer:  

Step Down Transformer: The Transformer that expands the voltage from Primary (essential) to Secondary (auxiliary) (more optional twisting turns than essential winding turns) loops called Step Down Transformer.

Explanation:

A transformer that reduces high voltage to low voltage is called a step-down transformer. The step-down transformers are that transformers which have high turns on its primary coils than secondary.  

Where  

Vp = Voltage in Primary Coil  

Ip = Current in Primary Coil  

Vs = Voltage in Secondary Coil  

Is = Current in Secondary Coil

where are the vectors ?

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.