Respuesta :
Answer:
The equivalent resistance of the input circuit is 2547.36 Ω.
Step-by-step explanation:
Given : A transformer draws 19 W of power from a 220 V power line, stepping the voltage down to 8.0V.
To find : What is the equivalent resistance of the input circuit?
Solution :
The relationship between power, voltage, and resistance is given by,
[tex]P =\frac{V^2}{R}[/tex]
The voltage is V=220 volt
The power is P=19 W
Substitute the value,
[tex]19=\frac{(220)^2}{R}[/tex]
[tex]19=\frac{48400}{R}[/tex]
[tex]R=\frac{48400}{19}[/tex]
[tex]R=2547.36[/tex]
The equivalent resistance of the input circuit is 2547.36 Ω.
