Exam-style question
Try this first
Describe how a step-up transformer operates in power transmission.
Model answer
What a good answer should say
- A step-up transformer operates by increasing the voltage from the primary coil to the secondary coil.
- When alternating current passes through the primary coil, it creates a changing magnetic field, which induces a higher voltage in the secondary coil due to the greater number of turns in that coil.
- This higher voltage allows for efficient long-distance power transmission.
Explanation
Why this works
This answer is strong as it outlines the operation of a step-up transformer, detailing the cause (alternating current in the primary coil), the mechanism (changing magnetic field inducing voltage), the effect (increased voltage in the secondary coil), and the consequence (efficient long-distance transmission). The question assesses the ability to describe the function of transformers in electrical engineering.
Common mistake
No common mistake is linked to this question yet.