Select all the true statements that apply to the equivalent circuit of a dc motor from the list below.

The developed mechanical power $({}_m{T}_{\text{d}\text{e}\text{v}})$ is not equal to the developed electrical power $(E_A{I}_A).$

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The electromotive force $($voltage$)$ of a motor is induced due to the force of the electric field density.

$E_A$ is sometimes called back emf $($electromotive force$)$ because it opposes the applied external terminal voltage.

The armature current in a motor can be obtained from the electrical or mechanical energy:

$I_A=\frac{V_T-E_A}{R_A}$ and $I_A=\frac{T_{\text{d}\text{e}\text{v}}}{K}.$