Question

Briefly explain each answer and show work

The primary side of a transformer takes in 120 Volts and has 75 coils. The secondary side of the transformer has an output voltage of 24 Volts, how many coils are on the secondary side? 15 Coils 75 Coils 300 Coils More information needed When using a lens to magnify the text for reading, what is true about the focal length, object distance, and image distance? fis positive. f is negative. do is positive. d. is negative. di is positive. d; is negative.

Answer 1

Ans

1

Number of secondsry coils = 15

2

f is positive.

d_o is negative.

d_i is negative.

Explanation

1

Number of primary coils N_p = 75

Primary voltage V_p = 120 Volts

Secondary voltage V_s = 24 Volts

Let N_s = Number of secondary coils

As

$\frac{N_s}{N_p} = \frac{V_s}{V_p}$

N. = Nox V

$N_s= 75 \times \frac{24}{120}$

Coils

2

We use Convex lens for magnify the text. When object is placed between focus of lens and optical center then it creates a magnified virtual image.

Now for convex lens f is positive.

Object is left side of lens so d_o is negative.

Image is virtual and on the same side of object thus d_i is negative.

Please feel free to comment if you have doubt

Cheers