The power substation pictured uses transformers to step down the voltage in order to make it ready to travel over the transmission lines. The primary coil in the transformer has ________ coils and this induces a _______ current in the secondary coil.
A: less, larger
B: more, larger
C: more, smaller
C: more, smaller
The primary coil in the transformer has **more** coils, and this induces a **smaller** current in the secondary coil.
To determine the answer, we need to recall the basic principles of transformers. Transformers work based on the principle of electromagnetic induction, where a changing magnetic field induces a current in a nearby conductor.
In a transformer, the primary coil is the one connected to the power source, and the secondary coil is the one connected to the load. The number of coils in each coil determines the voltage ratio between the primary and secondary sides.
According to the question, the voltage needs to be stepped down, which means the output voltage on the secondary coil is smaller than the input voltage on the primary coil. Therefore, the primary coil should have more turns (coils) than the secondary coil.
Now, let's examine the options:
A: less, larger
According to this option, the primary coil has fewer turns (coils) than the secondary coil. However, it contradicts our earlier understanding that the primary coil should have more turns, so this option is incorrect.
B: more, larger
According to this option, the primary coil has more turns (coils) than the secondary coil. This aligns with our earlier understanding, so it is a plausible answer.
C: more, smaller
According to this option, the primary coil has more turns (coils) than the secondary coil. However, it contradicts the information given in the question, which states that the voltage needs to be stepped down. So, this option is also incorrect.
Therefore, the correct answer is B: more, larger.