Question

A step-down transformer is used for re-charging the batteries of portable devices such as tape players. The ratio of turns inside the transformer is 10:1, and it is used with 120 V (rms) household service. A particular ideal transformer draws 0.350 A from the house outlet.

A) What are the voltage.
B) What are the current supplied to a tape player from the transformer?
C) How much power is delivered?

Answer 1

Answer with Explanation:

We are given that

`(N_1)/(N_2)=10`

`V_1=120 V`

`I_1=0.350 A`

a.
`(V_1)/(V_2)=(N_1)/(N_2)`

Using the formula

`(120)/(V_2)=(10)/(1)`

`V_2=(120)/(10)=12 V`

b.
`(I_2)/(I_1)=(N_1)/(N_2)`

`(I_2)/(0.350)=10`

`I_2=0.350* 10=3.5 A`

c.Power delivered,P=
`I_2V_2=I_1V_1`

`P=120* 0.350=42 W`