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add note about exclusion of efficiency from transformer equation

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Akbar Rahman 2023-03-23 11:54:24 +00:00
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uni/mmme/2051_electromechanical_devices/transformers.md
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@ -23,6 +23,8 @@ This coil has a current induced in it by induced magnetic field.
$$\frac{i_s}{i_p} = \frac{v_p}{v_s} = \frac{n_p}{n_s} = \text{turns ratio}$$ $$\frac{i_s}{i_p} = \frac{v_p}{v_s} = \frac{n_p}{n_s} = \text{turns ratio}$$
**Note that the current fraction is s over p, not p over s like the others.** **Note that the current fraction is s over p, not p over s like the others.**
Transformers have very high efficiency so will not be considered for this module and
has been left out of the equation above.
Derivation in lecture slides (pp. 12-15). Derivation in lecture slides (pp. 12-15).
Transformers are usually described as having a ratio $p:s$, where $p$ is the number of primary coils Transformers are usually described as having a ratio $p:s$, where $p$ is the number of primary coils