# circuits 1 — Ohm's law & resistors; V=iR

> Electrical engineering fundamentals: Ohm's law, resistors, and circuit calculations. (iPhone/iPad app by Sigma SKY, LLC.)

- Source: https://appshunter.io/ios/app/circuits-1/id598856499 (this page in markdown: same URL + `.md`)
- Developer: [Sigma SKY, LLC](https://appshunter.io/developer/320947305)
- Category: Education, Reference
- Price: $3.99 (on sale, was $7.99)
- Rating: 4.50/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.3 · 15 MB
- Languages: American English
- Released: 2013-02-08
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/circuits-1/id598856499/reviews.md

## What is circuits 1?

Circuits 1 is a fundamental course in electrical engineering. This app is designed to complement that and covers some of the basics commonly taught in these classes.
 It includes:
+ the fundamental theory of Ohm's law 
+ some applications of resistors such as voltage divider and series/parallel resistor circuits 
+ engineering pad for more problem solving/discussion and collaboration
+ resistor color code calculator
+ and more

In addition to presenting theory, worksheets and examples are included for further understanding of this topic.

No in-app purchase.
No ads.
Accessible offline.

## Key features

- Ohm's law theory
- Resistor applications (voltage divider, series/parallel)
- Engineering pad for problem-solving
- Resistor color code calculator
- Worksheets and examples
- Offline accessibility

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/circuits-1/id598856499/reviews.md

### 4/5 — Great app!

*2014-02-27*

I'm taking a circuits class now, and this app helps summarize the major concepts in a way that is easy to understand. There are examples of each concept and circuit calculators for each topic.
I downloaded this app hoping to have practice problems with an instant way to check answers. 
I think if this app had practice questions like the examples, it would definitely help people get circuits fast, and I would give it 5 stars without a second thought. It would also be great to have examples and practices with superposition, node, and mesh analysis. 
Overall, it is clear a lot of work and expertise went into the creation of this app, and so far I have found nothing like it in the App Store.
Thanks for making this app and happy 5th anniversary to Sigma Sky!

## Frequently asked questions about circuits 1

### What is Circuits 1?

Circuits 1 is an educational app designed to teach the fundamental concepts of electrical engineering, including Ohm's law and resistor applications. It offers theory, examples, and tools like a resistor color code calculator.

### What electrical concepts does Circuits 1 cover?

Circuits 1 covers the fundamental theory of Ohm's law, applications of resistors such as voltage dividers, and series/parallel resistor circuits. It also includes a resistor color code calculator.

### Can I use Circuits 1 offline?

Yes, Circuits 1 is accessible offline, allowing you to learn and practice electrical engineering concepts without an internet connection.

### How much does Circuits 1 cost?

Circuits 1 is a paid app, available for $3.99. There are no in-app purchases or advertisements.

### Does Circuits 1 have ads?

No, Circuits 1 is ad-free. The app was designed without advertisements to provide an uninterrupted learning experience.

### What devices is Circuits 1 available on?

Circuits 1 is supported on iPhone, iPad, and iPod devices, making it accessible for Apple users on the go.

### How often is Circuits 1 updated?

The latest version of Circuits 1 is 1.5, last updated on January 24, 2023. This indicates regular maintenance and potential feature additions.

### What is the age rating for Circuits 1?

Circuits 1 has an age rating of 4+, making it suitable for a wide range of users interested in learning basic electrical engineering principles.

## Version history (last 5 releases)

### 1.5 — 2023-01-24

This version contains iOS update, bug fixes, and improvements.

### 1.4 — 2020-01-14

Bug fixes and performance improvements, OS updates.

### 1.3 — 2017-02-21

Bug fixes and performance improvements.

### 1.2 — 2016-03-16

Bug fixes and performance improvements.

### 1.1 — 2014-06-06

- add 'save' feature for engineering pad
- iOS 7 support

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## More apps by Sigma SKY, LLC

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- [anotherABC](https://appshunter.io/ios/app/anotherabc/id516045568)

All apps by Sigma SKY, LLC: https://appshunter.io/developer/320947305

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*