Determining the type of transformer to be used in practical activities or used for charging batteries, an analysis test can be carried out by looking at the current and voltage on the transformer to be selected for use in the desired activity so that the most efficient transformer is obtained. This research was conducted to see the best and efficient transformer between the toroidal transformer and the iron transformer by using current analysis and input and output voltage. Then calculate the percentage of efficiency on each transformer so that the most efficient transformer is obtained between the Toroidal Transformer and the Iron Core Transformer. In this study, using Transformer Efficiency Analysis in Labview-Based Battery Charging Process. Labview itself is used as a user interface for measuring current and output voltage on a transformer with 24 Volt battery loading. So that we get the Output Current Trendline which later can be used to determine the efficiency of the transformer

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