Introductory Circuit - Google Play

Introductory Circuit is a step-by-step course in DC and AC circuit analysis for beginners. Every topic explains the idea in plain language, then works through examples with every step shown, and ends with practice questions you can tap to reveal the answers. Clear circuit diagrams and graphs are drawn for the app, and all formulas are typeset so they stay sharp on any screen.

What you will learn:
• Charge, current and voltage: atoms and electric charge, current, voltage and potential difference, voltage and current sources, cells and batteries
• Resistance: resistivity and wire resistance, temperature effects, thermistors and other special resistors, resistor types, the colour code and preferred values
• Ohm's law, power and energy: Ohm's law, electric power, energy in kilowatt-hours and efficiency
• Series circuits: Kirchhoff's voltage law, the voltage divider, internal resistance and loading
• Parallel circuits: Kirchhoff's current law, the current divider, open and short circuits
• Series-parallel networks: the reduce-and-return method, worked problems, ladder and bridge networks
• Methods of analysis: source conversion, branch-current method, mesh analysis and nodal analysis, each with fully worked examples
• Network theorems: superposition, Thevenin's theorem, Norton's theorem and maximum power transfer
• Capacitors and inductors: capacitance, RC charging and discharging, time constants, inductance, RL transients and stored energy
• Introduction to AC: sine waves, RMS and average values, phase and phasors, reactance, impedance, AC power and resonance
• Measurement and problem solving: using a multimeter, meter loading, electrical safety, fuses and RCDs, and a step-by-step strategy for any circuit problem

Who it is for:
Students starting electrical or electronic engineering, physics and technology students, apprentices and hobbyists who want to understand circuits, not just memorise formulas. The same reference circuit is solved with several methods, so you can see how they connect.

Features:
• 41 lessons in 11 sections, from atoms to AC impedance
• Worked examples with full steps and checks
• Practice questions with answers on every topic
• Original circuit diagrams, graphs and phasor drawings
• Works offline
• Search across all lessons
• Dark mode
• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia

This app is an independent study aid. It uses SI units and the conventions of standard textbooks. Work on mains equipment only if you are qualified.