🔍 Key Concepts

• Tapped transformer (autotransformer) connections between source side and load side • How the percentage of winding used (25%, 50%, 75%) affects the voltage seen by the load • Difference between step-up vs. step-down transformer action based on where the load is connected

💭 Think About

• Look at where the source is connected on the winding and where the load is connected. Is the load across the full winding, or only a portion of it? • If the load is connected to a tap labeled less than 100% of the winding, would the load see more voltage than the source, or less? • Compare figure A and figure B: in which case is the load isolated from the source, and in which case is it directly related to a fraction of the source winding?

✅ Before You Answer

• Identify clearly which terminals are on the source side (X–Y) and which are on the load side • Note that the taps are marked 25%, 50%, 75% – ask what fraction of the source voltage the load will get at each tap • Decide whether that fraction means the device is effectively increasing or decreasing the voltage applied to the load