SSC JE Electrical Syllabus 2026 – Paper-I & Paper-II Complete Syllabus

1. Fundamentals of Electrical Engineering

Basic foundational concepts required for understanding electrical circuits, electromagnetic systems, and machine operations:

• Circuit Elements: Resistors, capacitors, inductors, batteries, and practical voltage/current sources.
• Physical Factors: Factors affecting resistance (resistivity, temperature coefficient), factors affecting capacitance (dielectric permittivity, plate area, spacing), and factors affecting inductance.
• Core Electrical Quantities: Voltage, current, electrical power, electrical energy, magnetic flux, and standard SI/derived electrical units.
• Fundamental Laws: Ohm's Law, Joule's Law of heating, and power dissipation relationships ($P = VI = I^2R = V^2/R$).

2. Network Solution Methods

Techniques and systematic procedures for solving complex DC and resistive networks:

• Kirchhoff's Laws: Kirchhoff's Current Law (KCL at nodes) and Kirchhoff's Voltage Law (KVL around closed loops).
• Systematic Analysis: Nodal analysis (node-voltage method), mesh analysis (loop-current method), and supernode/supermesh techniques.
• Circuit Configurations: Series-parallel resistor combinations, current divider rule, voltage divider rule, and circuits with multiple independent and dependent sources.

3. Network Theorems

Analytical theorems used for network simplification and power transfer optimization:

• Thevenin's Theorem: Thevenin equivalent voltage ($V_{th}$), equivalent resistance ($R_{th}$), and linear two-terminal network reduction.
• Norton's Theorem: Norton equivalent short-circuit current ($I_N$) and Norton equivalent resistance ($R_N$).
• Superposition Theorem: Principle of linearity, algebraic addition of individual source responses, and application rules.
• Maximum Power Transfer Theorem: Derivation for DC circuits ($R_L = R_{th}$) and AC circuits ($Z_L = Z_{th}^*$), efficiency under maximum power condition (50%).
• Source Transformation: Practical voltage-to-current source and current-to-voltage source equivalence.

4. Magnetic Circuits

Principles bridging electromagnetic field concepts with transformer and rotating machine designs:

• Magnetic Concepts: Magnetic flux ($\Phi$), flux density ($B$), magnetic field intensity ($H$), permeability ($\mu$), and Magnetomotive Force ($ ext{MMF} = NI$).
• Reluctance & Permeance: Reluctance of magnetic path ($S = l / (\mu A)$), series and parallel magnetic circuits, leakage flux, and fringing effect.
• Inductance Principles: Self-inductance ($L = N\Phi/I$), mutual inductance ($M = k\sqrt{L_1 L_2}$), coefficient of coupling ($k$), dot convention, and energy stored in magnetic field ($W = rac{1}{2}LI^2$).

5. AC Fundamentals

Single-phase and polyphase alternating current theory, resonance, and complex power:

• AC Waveforms & Parameters: Instantaneous value, peak value, RMS value ($V_{rms} = V_m/\sqrt{2}$ for sine), average value ($V_{avg} = 2V_m/\pi$), form factor (1.11), and peak/crest factor (1.414).
• AC Circuits: Pure R, pure L, pure C circuits; series and parallel RL, RC, and RLC circuits; impedance ($Z$), admittance ($Y$), reactance ($X_L, X_C$), and phasor diagrams.
• Resonance: Series resonance ($\omega_0 = 1/\sqrt{LC}$), parallel resonance (anti-resonance), resonant frequency, dynamic impedance, Quality factor ($Q$), and bandwidth.
• Three-Phase Systems: Balanced 3-phase circuits, star (Y) connection ($V_L = \sqrt{3}V_{ph}, I_L = I_{ph}$), delta ($\Delta$) connection ($V_L = V_{ph}, I_L = \sqrt{3}I_{ph}$), Star-Delta transformations, and 3-phase power calculation ($P = \sqrt{3}V_L I_L \cos\phi$).
• Power Concepts: Active power ($P = VI\cos\phi$), reactive power ($Q = VI\sin\phi$), apparent power ($S = VI$), power triangle, power factor ($\cos\phi$), leading/lagging effects, and power factor improvement using shunt capacitors.

6. Measurement & Measuring Instruments

Construction, operating principles, error analysis, and range extension of electrical instrumentation:

• Instrument Classification: Indicating, recording, and integrating instruments; deflecting, controlling (gravity/spring), and damping (air friction, fluid, eddy current) torques.
• Analog Meters: Permanent Magnet Moving Coil (PMMC) meters (DC only, linear scale), Moving Iron (MI) meters (AC/DC, square law scale), dynamometer wattmeters, and electrostatic voltmeters.
• Range Extension: Shunts for ammeters ($R_{sh} = R_m/(m-1)$) and multipliers for voltmeters ($R_{se} = R_m(m-1)$).
• Bridges: Wheatstone bridge (medium resistance), Kelvin's double bridge (low resistance), Maxwell's bridge (medium inductance), Hay's bridge (high Q inductance), Schering bridge (capacitance/dielectric loss), and Wien's bridge (frequency).
• Energy Meters & Megger: Induction type energy meter, constructional features and calibration of single-phase electronic energy meters, creeping error, and Megger for insulation resistance testing.
• Instrument Transformers: Current Transformer (CT) and Potential Transformer (PT) construction, ratio error, phase angle error, and burden.

7. Electrical Machines

High-yield core section encompassing transformers, direct current machines, and induction motors:

7.1 Transformers

• Single-phase and three-phase transformers: Core type and shell type construction, working principle, and EMF equation ($E = 4.44 f N \Phi_m$).
• Turns ratio, transformation ratio, ideal vs practical transformer, phasor diagrams on no-load and full-load.
• Equivalent circuit referred to primary/secondary, open-circuit (OC) test (core losses), short-circuit (SC) test (copper losses), voltage regulation, and all-day efficiency.
• Auto-transformers: Copper saving principle, applications, and comparisons with two-winding transformers.

7.2 DC Machines

• Construction: Stator yoke, armature core, field poles, commutator, and carbon brushes.
• DC Generators: Working principle, Fleming's Right-Hand Rule, EMF equation ($E_g = rac{\Phi Z N}{60} \cdot rac{P}{A}$), lap vs wave windings, types (shunt, series, compound), and open-circuit/load characteristics.
• DC Motors: Working principle, Fleming's Left-Hand Rule, back EMF ($E_b$), torque equation ($T \propto \Phi I_a$), speed-torque curves of shunt, series, and compound motors.
• Motor Starting & Speed Control: 3-point and 4-point starters, flux control method, armature resistance control, and Ward-Leonard system.
• Losses & Efficiency: Copper loss, iron loss (hysteresis & eddy current), mechanical loss, and Swinburne's test.

7.3 AC Induction Motors

• 3-Phase Induction Motors: Production of rotating magnetic field (RMF), synchronous speed ($N_s = 120f/P$), slip ($s = (N_s - N)/N_s$), rotor frequency, and equivalent circuit.
• Torque Equation: Starting torque, maximum torque ($T_{max}$ independent of rotor resistance), slip at maximum torque ($s_{max} = R_2/X_2$), and torque-speed characteristics.
• Starting & Speed Control: Direct-on-line (DOL), star-delta starter, auto-transformer starter, rotor resistance starting (slip-ring), pole-changing, and V/f control.
• Electrical Braking: Regenerative braking, plugging, and dynamic (rheostatic) braking.
• Single-Phase Induction Motors: Double revolving field theory, split-phase, capacitor-start, capacitor-start capacitor-run, and shaded-pole motors.

8. Special Electrical Machines & Synchronous Generators

Fractional horsepower motors and synchronous alternator performance:

• Special Machines: Fractional kilowatt motors, stepper motors, universal motors, AC/DC servomotors, and brushless DC (BLDC) motors.
• Synchronous Generators (Alternators): Salient pole vs cylindrical rotor construction, pitch factor ($k_p$), distribution factor ($k_d$), EMF equation, and voltage regulation methods (synchronous impedance method).
• Armature Reaction: Effect of unity, zero lagging, and zero leading power factor on main field flux.
• Parallel Operation: Conditions for synchronization, dark lamp method, synchroscope, and load sharing between alternators.

9. Generation of Electrical Power

Economics of power generation and energy management principles:

• Power Stations: Thermal power plants (Rankine cycle, coal handling, boilers, condensers, cooling towers), hydroelectric power plants (catchment, penstock, surge tanks, turbines), nuclear power plants (fission, moderators, control rods), and gas turbine plants.
• Tariffs & Load Curves: Load curve, load duration curve, base load vs peak load stations.
• Economic Factors: Connected load, maximum demand, Demand Factor ($<1$), Load Factor ($= ext{Average Load}/ ext{Max Demand}$), Diversity Factor ($>1$), Plant Capacity Factor, and Plant Use Factor.
• Power Factor Correction: Disadvantages of low power factor, static capacitor banks, synchronous condensers, and phase advancers.

10. Transmission & Distribution

Line parameters, high-voltage phenomena, switchgear, and network protection:

• Transmission Lines: Line parameters (resistance, inductance, capacitance, conductance), short, medium (Nominal-T, Nominal-$\pi$), and long transmission lines; voltage regulation and transmission efficiency.
• High-Voltage Phenomena: Corona effect (critical disruptive voltage, visual critical voltage, power loss factors, methods of reducing corona), and Ferranti effect (receiving end voltage greater than sending end voltage under light load/no load).
• Underground Cables: Cable construction (core, insulation, metallic sheath, bedding, armouring, serving), cable insulation resistance, dielectric stress, capacitance of 3-core cables, coaxial cables, and cable ratings.
• Switchgear & Protection: Fuses, circuit breakers (air-break, air-blast, oil, vacuum, $ ext{SF}_6$ circuit breakers), arc quenching mechanisms; protective relays (overcurrent, directional, distance, differential relays); protection of alternators (Merz-Price differential protection) and transformer protection (Buchholz relay).

11. Electrical Estimation & Costing

Practical installations, statutory safety codes, and cost estimations:

• Wiring Systems: Cleat wiring, casing-capping, CTS/TRS wiring, conduit wiring (surface and concealed).
• Estimation Practices: Internal lighting scheme estimation, sub-circuit design, power wiring, installation of industrial electric motors, and cable scheduling.
• Earthing & Protection: Pipe earthing, plate earthing, earth resistance measurement, and safety precautions against electric shock.
• Statutory Indian Electricity (IE) Rules: IE Rules regarding voltage classification, permissible voltage drop, insulation resistance limits, and clearance distances.

12. Utilization of Electrical Energy

Industrial applications of electrical power in illumination, heating, welding, and transport:

• Illumination: Laws of illumination (Inverse Square Law, Lambert's Cosine Law), luminous flux, illuminance (lux), luminous intensity (candela), maintenance factor, utilization factor, incandescent lamps, fluorescent tubes, sodium vapour lamps, mercury vapour lamps, and LED lighting design.
• Electric Heating: Resistance heating (direct and indirect), induction heating (core type and coreless), and dielectric heating (principles and high-frequency applications).
• Electric Welding: Resistance welding (butt, spot, seam, projection) and electric arc welding (carbon arc, metal arc, TIG, MIG).
• Electroplating: Faraday's laws of electrolysis, electrodeposition process, and extraction of metals.
• Electric Traction: Systems of electric traction, speed-time curves (trapezoidal and quadrilateral), crest speed, average speed, schedule speed, traction motors (DC series motor, 3-phase induction motor), and overhead catenary equipment.
• Electric Drives: Selection of electric motor drives for industrial applications, continuous and intermittent duty cycles.

13. Basic Electronics

Semiconductor devices, discrete circuit analysis, amplifiers, and oscillators:

• Semiconductor Diodes: P-N junction diode, forward and reverse bias characteristics, Zener diode, breakdown mechanisms (avalanche and Zener breakdown), and Zener voltage regulators.
• Rectifiers & Filters: Half-wave, center-tapped full-wave, and bridge rectifiers; ripple factor, rectification efficiency, PIV ratings; shunt capacitor, series inductor, and $\pi$-filters.
• Wave Shaping Circuits: Positive and negative clipping circuits, biased clippers, and clamping circuits (DC inserters).
• Transistors (BJT & FET): Bipolar Junction Transistor (CB, CE, CC configurations, input/output characteristics, $\alpha, eta, \gamma$ relationships), transistor biasing and thermal stability; Field Effect Transistor (JFET, MOSFET, construction, drain characteristics, and transfer curves).
• Amplifiers & Oscillators: Small-signal CE amplifier, gain, bandwidth, frequency response; feedback amplifiers (positive and negative feedback advantages); Barkhausen criterion for oscillations, Hartley, Colpitts, and RC phase-shift oscillators.

14. Power Electronics

Solid-state power devices, static switching converters, and controlled phase rectifiers:

• Thyristor (SCR): Four-layer PNPN structure, static V-I characteristics, latching current ($I_L$), holding current ($I_H$), gate triggering mechanisms, dv/dt and di/dt protection (snubber circuit).
• Gate Firing Circuits: Resistance firing, RC firing circuits, and UJT relaxation oscillators for SCR triggering.
• DC-DC Switch-Mode Converters: Buck converter (step-down, $V_o = D \cdot V_s$), Boost converter (step-up, $V_o = V_s / (1-D)$), and Buck-Boost converter (inverting, $V_o = rac{D}{1-D} V_s$).
• Controlled Rectifiers: Single-phase half-controlled rectifier, single-phase full-controlled bridge rectifier (with resistive and inductive loads), midpoint-controlled rectifier, output voltage expressions, and firing angle ($\alpha$) control.