# Questions tagged [power-transfer]

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### Power Transmitting and Receiving from antenna of same frequency? [closed]

I want to ask something about power transmitting and accepting. If we have a source antenna of 2.45GHz and a receiver antenna of 900MHz. Could the receiver accept the power transmitting by the source? ...
695 views

### What exactly carries energy in a transformer from primary to secondary? [duplicate]

Suppose we have applied a voltage to a transformer with an open secondary, we will get a certain flux in the core and a certain voltage at the secondary depending upon the turns ratio. Now, suppose we ...
154 views

### how to calculate the maximum power transfer? (specific exercise example included)

I have a hard time figuring out how to calculate the maximum power transfer.. Can anyone help? I understand that you need to calculate the thevenin resistance by killing the sources and summing the ...
57 views

### Digital regulator for DCM Boost - How does it relate to duty cycle?

I really hope someone can help me here, I'm tearing my hair out trying to bridge the gap between control theory and electronics. My aim is to control a discontinuous conduction mode boost converter ...
129 views

### How can the maximum average power transfer be negative in a power delivery circuit?

It is possible that the Thevenin resistance $R_{Th}$ of a circuit is negative. This occurs in non-linear circuits. Likewise, in AC circuits, the real part of $Z_{Th}$ can be negative. For AC ...
121 views

### Why can't we operate at high frequencies (>0.5GHz) when having a resonant inductive coupling circuit?

I am currently trying to figure out if a high frequency (GHz) resonant inductive coupling circuit would be feasible and efficient when wirelessly transferring power. Through many research papers, ...
567 views

### Simple maximum power transfer question

I am asked to determine what the unknown component (Zs) is. I know that the maximum power theorem states (after derivation) that the $$P_{\text{load}}=\frac{V_{\text{th}^2}}{4R_{\text{th}}}$$ I ...
5k views

### Can I use an AC motor to generate electricity which is mounted to a bicycle by a belt or I need it to be a DC motor?

I am trying to build a generator connected to a heater (250 Watts = 0.335HP). The energy goes to the motor from a bicycle. So the question is: should I use an AC motor or a DC one?