Focus on 5 Core Modules: (1) DC Circuits (Energy calculation in kWh, Electricity bill calculation, Active/Passive elements, Series/Parallel resistors, KCL/KVL nodal analysis, Current division rule); (2) Electromagnetism & AC Machines (Faraday’s laws, Mutual EMF, 440kVA Transformer voltage/current calculations, DC Generator Lap/Wave EMF equation); (3) Semiconductor Devices (PN junction characteristics, BJT Transistor in CB and CE modes, alpha/beta relationships, Half-wave/Full-wave rectifiers with RC capacitor filter and ripple calculation); (4) Operational Amplifiers (Inverting, Non-Inverting, Summing, Integrator, Differentiator & Ideal Op-Amp characteristics); (5) Digital Logic & Embedded (NAND/NOR universal gates, JK Flip-Flop using NAND, Microcontroller architecture block diagram).
Key Points: Total Power = (2 * 100) + (2 * 60) = 320 W = 0.32 kW. Daily Energy = 0.32 kW * 10 h = 3.2 kWh. Monthly Energy (30 days) = 3.2 * 30 = 96 kWh (units). Total Bill = 96 units * Rs 2.00 = Rs 192.00.
Key Points: Draw circuit diagrams using virtual ground concept. Inverting: Vout = -(Rf/R1) * Vin. Non-Inverting: Vout = (1 + Rf/R1) * Vin. Summing: Vout = -Rf * (V1/R1 + V2/R2 + V3/R3). Ideal Op-Amp properties: infinite open-loop gain (A=inf), infinite input impedance (Rin=inf), zero output impedance (Rout=0), infinite bandwidth.
Key Points: Turn ratio K = V2/V1 = 440/6600 = 1/15. N2 = N1 * K = 1200 / 15 = 80 turns. Primary current I1 = S / V1 = 440000 / 6600 = 66.67 A. Secondary current I2 = S / V2 = 440000 / 440 = 1000 A. Max flux Phi_m = V1 / (4.44 * f * N1) = 6600 / (4.44 * 50 * 1200) = 0.0247 Wb.
Key Points: NOT: Connect inputs together into NAND. AND: Connect NAND output to NAND inverter. OR: Invert inputs A and B through NAND inverters, feed into NAND. XOR: Use 4 NAND gates.
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