-If the primary L1 in Figure has 40 turns and the secondary L2 has 10 turns, what is the reflected resistance into the primary if the load resistance is 120 Ω?
A) 1920 Ω
B) 480 Ω
C) 30 Ω
D) 7.5 Ω

Question

-If the primary L1 in Figure  has 40 turns and the secondary L2 has 10 turns, what is the reflected resistance into the primary if the load resistance is 120 Ω?
A) 1920 Ω 
B) 480 Ω 
C) 30 Ω 
D) 7.5 Ω

Quizplus · Accepted Answer

The reflected resistance into the primary can be calculated using the formula $R_{reflected} = R_{load} \times (\frac{N_{primary}}{N_{secondary}})^2$, where $R_{load}$ is the load resistance, $N_{primary}$ is the number of turns in the primary coil, and $N_{secondary}$ is the number of turns in the secondary coil. Plugging in the given values: $R_{reflected} = 120 \times (\frac{40}{10})^2 = 120 \times 16 = 1920 \Omega$.

-If the Primary L1 in Figure Has 40 Turns