**1. Plug-in board NTC-01/1 ExtLab “DC circuits and Omh’s law”:**

- EMF source in electrical circuits;
- experimental verification of Omh’s law;
- investigation of series-connected resistors;
- investigation of parallel-connected resistors;
- investigation of mixed-connected resistors;
- studying of Wheatstone bridge.

**2. Plug-in board NTC-01/12 ExtLab «Kirchhoff’s laws»:**

- Kirchhoff’s laws;
- measurement of potentials in electrical circuit;
- potential chart plotting;
- experimental verification of current superposition principle;
- experimental verification of node potential method.

**3. Plug-in board NTC-01/3 Extlab “Single-phase RC AC circuits” :**

- investigation of sinusoidal current circuit with capacitor;
- investigation of parallel-connected capacitors;
- investigation of series-connected capacitors;
- investigation of series-connected capacitor and resistor;
- investigation of parallel-connected capacitor and resistor.

**4. Plug-in board NTC-01/4 ExtLab “Single-phase RL AC circuits”:**

- investigation of sinusoidal current circuit with inductance coil;
- studying of magnetization curve of the core;
- investigation of series-connected inductance coils;
- investigation of parallel-connected inductance coils.

**5. Plug-in board NTC-01/14 ExtLab “Single-phase RLC AC circuits”**

- investigation of sinusoidal voltage and current parameters;
- investigation of AC electrical circuit with inductance;
- investigation of AC electrical circuit with capacitor;
- investigation of AC electrical circuit with series-connected L and C (voltage resonance);
- investigation of AC electrical circuit with parallel-connected L and C (current resonance);

– inductively-connected circuits:

- investigation of parallel connection of inductively-connected coils;
- investigation of serial connection of inductively-connected coils;

– ferroresonance circuits:

- investigation of ferroresonance circuit.

**6. Plug-in board NTC-01/6 ExtLab “Single-phase transformer”:**

- investigation of no load operation of the transformer;
- investigation of short-circuit mode of the transformer;
- investigation of active (resistive) load mode of the transformer.

**7. Plug-in board NTC-01/5 ExtLab «Three-phase cicruits»: **

- investigation of three-phase circuit with symmetrical, asymmetrical and equal Y-connected energy receivers with neutral wire and without it;
- investigation of three-phase circuit with symmetrical, asymmetrical and equal delta-connected energy receivers.

**8. Plug-in board NTC-01/7 ExtLab «Bipolar transistor»:**

- investigation of characteristics of bipolar transistor;
- investigation of transistor amplifier diagram with common emmiter;
- investigation of two-stage amplifier schematic;
- investigation of transistor amplifiers with A, AB and B classes on the bipolar transistor;
- investigation of transistor switching mode.

**9. Plug-in board NTC-01/9 ExtLab «Electrical machinery»:**

- investigation of mechanic and operating characteristics of DCM;
- investigation of the methods of controlling the speed rotation of DCM (rheostat and changing power voltage);
- investigation of the characteristics of DC generator;
- investigation of mechanic and operating characteristics of squirrel-cage asynchronous rotor;
- investigation of the methods of regulating the speed rotation of squirrel-cage asynchronous rotor.

**10. Plug-in board NTC-01/10 ExtLab “Three-phase transformers”:**

- determination of the connection groups of three-phase transformer windings.

**11. Plug-in board NTC-01/13 ExtLab «AC circuits»:**

- investigation of a passive two-pole in AC circuit;
- investigation of a linear circuit of periodic non-sinusoidal current.

**12. Plug-in board NTC-01/15 ExtLab “Transition processes in linear DC circuits”:**

- investigation of the transition process in RC circuit;
- investigation of the transition process in RL circuit;
- investigation of the transition process in RLC circuit with aperiodic charge and capacitor discharge.

**13. Plug-in board NTC-01/16 ExtLab “Circuits with non-linear resistive resistances”:**

- diode current-voltage test;
- voltage-reference diode current-voltage test
- varistor current-voltage test

**14. Plug-in board NTC-01/08 ExtLab «Field transistor»:**

- investigation of static characteristics of field transistor;
- investigation of the schematic of transistor amplifier with common source;
- investigation of the repeater schematic of variable resistor on the field transistor;
- measurement of static characteristics of the field transistor with isolated gate;
- investigation of the main schematics of the field transistor.