Now covering Linear Circuits I

Study circuits a little every day, and see it add up.

Saver is a bank of drawn circuit problems with new numbers every try, instant grading, step-by-step solutions, and a class leaderboard. Jump in without an account, or sign up to keep your progress.

Create a free account Try problems without an account

Streak

12 days

Points

184

Accuracy

81%

Study activity

88 active days in the last year

Everything for one course, in one place

Work a problem, check your answer, and see the full solution without switching between a problem set and a solutions manual.

Worked solutions and videos

Every problem has a step-by-step solution for your exact numbers, plus walkthrough videos when you're stuck.

Worked example

A 12 V source across a 4 kΩ resistor:

I = \frac{V}{R} = \frac{12\ \text{V}}{4\ \text{k}\Omega} = 3\ \text{mA}

Problems with instant feedback

Multiple-choice and numeric problems, graded right away, with full solutions when you need them.

Ohm's Law: Find the CurrentOHMEasy
Conservation of PowerPWRHard
Loaded Voltage DividerDIVHard
KCL With a Negative CurrentKCLMedium

Points, streaks, and a class leaderboard

Every problem you solve the first time earns points toward your class leaderboard. Work a problem each day to keep your streak.

Solve an easy problem+1 point
Solve a medium problem+2 points
Solve a hard problem+3 points

One square for every day you study

The activity calendar works like a contribution graph. Each day you work a problem, that day's square turns green, and it gets darker the more you do.

What counts: Submitting an answer. Just opening the site doesn't.
How streaks work: Study on consecutive days to build a streak. Days follow your own time zone, so a late-night session counts for the day you started it.
Why it helps: Spacing practice across many days beats cramming. The calendar makes the gaps easy to spot.

Study actions in a day

Courses

Starting with Linear Circuits I. More of the engineering core is on the way.

Available nowElectrical Engineering

Linear Circuits I

DC and AC circuit analysis from first principles: Kirchhoff's laws, nodal and mesh analysis, network theorems, op amps, RL/RC/RLC transients, and phasors.

26 topics: circuit fundamentals, Kirchhoff's laws, nodal and mesh analysis, and network theorems.

Start practicing

Mathematics
Differential Equations
Coming soon
Mathematics
Calculus I
Coming soon

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