It starts with reading the mains voltage off a sine wave and ends with three-phase faults and antenna matching. Each problem is marked warm-up, core, stretch or challenge, and 20 are tagged exam-style. Level counts: 26 warm-up, 40 core, 28 stretch, 6 challenge.

India or US supplies?

Both, with equal weight. 25 problems are worked on both 230 V 50 Hz and 120 V 60 Hz, 8 are India/IEC only, 8 are North America only, and the rest do not depend on the supply.

Are the answers right?

Yes. We re-solved every problem independently from its given values and checked every printed answer, and the key numbers in the working, at the digits shown. All 91 circuit problems were also solved in the ngspice circuit simulator, and all 406 printed numbers the simulations could check agreed. If you find a slip, write to contact@electronicsinfoline.com and it goes into the next edition.

Does it cover Laplace transforms, two-port networks or second-order transients?

No. It sticks to steady-state AC with phasors and first-order RC and RL switching, which is what most first AC courses examine.

Can I use it on a phone or tablet?

Yes. It is an ordinary PDF, and the figures are vector drawings that stay sharp when you zoom in. A tablet or a printout is easier to work from than a phone.

You get both, in one ZIP, with identical text and page numbers.

Can a teacher use it with a class?

The PDF is for one person’s study. For a classroom, coaching centre or ITI batch, write to contact@electronicsinfoline.com.

Printable A4 and US Letter workbook

AC Circuits Workbook

Name: AC Circuits Workbook
Brand: ElectronicsInfoline
Price: 299.00 INR
Availability: InStock

A hundred AC circuit problems that climb from sine waves and phasors to power-factor correction, resonance, filters and three-phase. Almost every problem has its circuit, waveform or phasor diagram drawn, and each has a full worked solution.

Edition 1.0, 76 pages (cover plus 75), in A4 and US Letter (2 PDFs) · ZIP with two PDFs of the same pages: one for A4, one for US Letter; prints well in greyscale

$9.99

Price in US dollars. One-time payment, no subscription.

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Unzip it, then print the file for your paper size at 100 %, or work from a tablet. To save paper, print the problem pages and keep the solutions on screen.

Preview

The cover, then four pages of the A4 version. The page previews carry a "Preview" watermark. The PDFs you download have none, and the figures are vector drawings that stay sharp at any zoom.

What’s inside

Sine waves, RMS and phase (8 problems)
Peak, RMS and peak-to-peak of both mains supplies. Period and ω, reading a scope, RMS of square, triangle and PWM waves, average-reading meters.
Complex numbers and phasors (8)
Rectangular and polar form, multiplying and dividing phasors, sine expressions to phasors, adding sine waves, KCL with phasors.
Reactance and impedance (10)
XL and XC at 50 Hz, 60 Hz and 1 kHz, X2 capacitors on the mains, measuring a coil with DC and AC, admittance and susceptance.
RC and RL time response (8)
The 63 % rule, relay coils and flyback spikes, reset delays, switch debouncing, rise time and bandwidth, bulk-capacitor discharge.
Series and parallel AC circuits (12)
Voltage triangles, tube-light chokes, fan capacitors, dimming a lamp with an inductor, ammeter readings that do not add, three-voltmeter and three-ammeter methods.
AC power and power factor (12)
P, Q and S, complex power, sizing an inverter and a UPS, correcting a pump motor and a shop compressor, kvar correction, wattmeter versus VA.
Resonance and Q (8)
Resonant frequency, Q and bandwidth, voltage magnification, tuning the medium-wave and FM bands, a lossy tank, a resonance nobody asked for.
Filters and decibels (10)
RC low-pass and high-pass cut-offs, dB both ways, PWM smoothing, rectifier ripple filters, a speaker crossover, cascaded sections, a twin-T hum notch, Bode asymptotes.
AC network analysis (8)
Source transformation, nodal and mesh analysis, Thevenin with two AC sources, DC plus AC, maximum power into a complex load, a Maxwell bridge, delta to star.
Transformers and three-phase (10)
Turns ratio and reflected impedance, sizing a bench transformer, efficiency; 400 V star, 120/240 V split-phase, 208Y/120 V and 480Y/277 V, star and delta loads, three-phase motor current.
Challenge problems (6)
A capacitive-dropper LED lamp (analysis only), a broken neutral on 400/230 V, an open neutral on 120/240 V, the two-wattmeter method, a series resonant circuit with two lossy parts, an L-network to match an antenna.
Worked solutions and answer key
Every problem is solved step by step in its own part of the book, with an answer key for quick checking.
AC conventions and a 2-page formula sheet
RMS phasors, var, polar form, and every formula the problems need.

Who it is for

Students in class 12 physics (AC chapter), diploma and polytechnic electrical or electronics courses, ITI electrician and electronics mechanic trades, and first-year engineering basic electrical courses in India. It also suits US and Canadian students in community-college and first-year AC circuits courses, and hobbyists and technicians who want to work out mains and audio circuits on paper. It assumes the DC basics: Ohm’s law, series and parallel, and KVL and KCL. The DC Circuits Workbook covers those.

Everything in the pack is also free on the site, spread across these pages. The pack puts it on paper in one place:

Tips and tricks

Convert every quantity to ohms, volts and hertz before you start. A capacitor in microfarads put into the reactance formula as farads is a common slip.
Sketch the phasor diagram first, even a rough one. It tells you whether the current should lead or lag, so a wrong sign shows up at once.
Check the supply tag on the problem. The same circuit gives different numbers on 230 V 50 Hz and 120 V 60 Hz, and 25 problems are worked on both.
Keep full precision until the last line. When your answer differs from the book in the final digit, look at your rounding before your method.

What we would do

Do the phasor chapters in order, because power factor, resonance and the filters all lean on them. The ideas are explained free in our AC Circuits, Energy Storage, Magnetism and Transformers, and DC Circuits lessons; the book puts them on paper in one place, with the problems and the full working.

Questions

What level is it?: It starts with reading the mains voltage off a sine wave and ends with three-phase faults and antenna matching. Each problem is marked warm-up, core, stretch or challenge, and 20 are tagged exam-style. Level counts: 26 warm-up, 40 core, 28 stretch, 6 challenge.
India or US supplies?: Both, with equal weight. 25 problems are worked on both 230 V 50 Hz and 120 V 60 Hz, 8 are India/IEC only, 8 are North America only, and the rest do not depend on the supply.
Are the answers right?: Yes. We re-solved every problem independently from its given values and checked every printed answer, and the key numbers in the working, at the digits shown. All 91 circuit problems were also solved in the ngspice circuit simulator, and all 406 printed numbers the simulations could check agreed. If you find a slip, write to [email protected] and it goes into the next edition.
Does it cover Laplace transforms, two-port networks or second-order transients?: No. It sticks to steady-state AC with phasors and first-order RC and RL switching, which is what most first AC courses examine.
Can I use it on a phone or tablet?: Yes. It is an ordinary PDF, and the figures are vector drawings that stay sharp when you zoom in. A tablet or a printout is easier to work from than a phone.
A4 or Letter?: You get both, in one ZIP, with identical text and page numbers.
Can a teacher use it with a class?: The PDF is for one person’s study. For a classroom, coaching centre or ITI batch, write to [email protected].

Price, tax and refunds

Rupee prices include GST, and you pay them through Razorpay. You pay dollar prices through PayPal. We never see your card or bank details. Because this is a digital download, the refund policy applies: if the file will not download or open, write to [email protected] within 7 days and we will fix it or send a replacement.