# Electrical engineering

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# Description

Objective 1
For the circuit shown in Fig. 1.1, you must:
1) create a system of equations to determine the currents through the direct application of Kirchhoff's laws;
2) create a balance of power.
Objective 2.
In a uniform magnetic field the coil (Fig. 2.1). Field lines are parallel to the axis of the coil. The dimensions of the coil: R1 = 50 cm, R2 = 56 cm. The maximum value of the magnetic induction Bm, w the number of turns of the coil and the complete cycle time variation of the magnetic induction T shown. Magnetic induction B varies with time as indicated in Fig. 2.2. It is necessary to construct a graph of EMF e (t), induced in the coil.

Terminal voltage circuit shown in Fig. 3.1, it varies like. Peak value Um and the initial phase ψ voltage and the values \u200b\u200bof active, inductive and capacitive resistances given. It is necessary to: 1) determine the readings indicated on the chart; 2) to determine the variation of the current in the circuit; 3) to determine the variation of voltage between points, which connect a voltmeter; 4) to construct a vector diagram.
Fig. 4.1 shows a circuit connected in parallel receivers. The voltage U at the terminals of the circuit, the values \u200b\u200bof active, inductive and capacitive resistance receivers listed. It is necessary: \u200b\u200b1) to draw the circuit diagram for the final version; 2) determine all currents; 3) to construct a vector diagram; 4) compare the value of the current I in the straight part of the chain, derived from the vector diagram, with the value obtained by calculation; 5) determine the active, reactive and apparent power consumed by the network.

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