Abstract
The recent comment on the paper (Wang 2017 Phys. Educ. 52 065019) attempts to show that the energy loss involved in charging a RC circuit is independent of the charging rate if the loss within the current source is considered. In this reply, the transistor-based control circuit is examined in more detail to reveal the mistake made in the analysis used in the comment. This reply demonstrates that there are additional energy contributions by the control, and, consequently, the total energy loss does depend on the charging rate and the waveform used.
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