A primary coil has 360 turns, while secondary has 120 turns in a transformer. The output voltage is 220V. What is the input voltage, and what type of transformer is it

550V

Step  - Down transformer

Explanation:

Given parameters:

Number of turns in primary coil  = 300 turns

Secondary turns  = 120 turns

Output voltage  = 220V

Unknown:

Input voltage  = ?

Type of transformer =  ?

Solution:

To solve this problem, we use the expression below:

       =  

So insert the parameters and find Vin;

        =  

    120Vin  = 220 x 300

           Vin  =   = 550V

Since the input voltage is greater than the output voltage, this is step - down transformer.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

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h=10