📚 Topic Summary
In a transformer circuit, power is transferred from the primary coil to the secondary coil through electromagnetic induction. The efficiency of this power transfer is a crucial aspect of transformer performance. We calculate power transfer by considering the input power, output power, and any power losses within the transformer. Understanding these calculations allows us to analyze and optimize transformer performance in various applications.
The ideal transformer assumes no power loss, meaning the input power equals the output power. However, real-world transformers experience losses due to factors such as resistance in the coils, hysteresis, and eddy currents in the core. These losses reduce the overall efficiency of the transformer. This lab activity focuses on calculating and analyzing power transfer, considering both ideal and real-world scenarios.
🧮 Part A: Vocabulary
Match the terms with their definitions:
| Term |
Definition |
| 1. Primary Coil |
A. Power consumed by the transformer. |
| 2. Secondary Coil |
B. The coil where the output voltage is induced. |
| 3. Input Power |
C. The coil connected to the voltage source. |
| 4. Output Power |
D. Power delivered by the transformer to the load. |
| 5. Efficiency |
E. The ratio of output power to input power. |
✍️ Part B: Fill in the Blanks
Complete the following paragraph with the correct words:
A transformer transfers electrical power from the ______ coil to the ______ coil. The power transfer is based on the principle of ______ ______. In an ideal transformer, the input power is equal to the ______ power. However, in real transformers, losses occur due to factors like ______ and ______, which reduce the overall efficiency.
🤔 Part C: Critical Thinking
Explain why the efficiency of a real-world transformer is always less than 100%, and describe two factors that contribute to these losses.