Mistake Master
Student view — seeing the site as a student does
Mistake Master · AP Physics C: E&M · Unit 11 · Step-Through Animation

A Minus Sign Is an Answer

You'll learnwhat a negative solved current is telling you, and where an ammeter and a voltmeter each belong.

Three branches meet at a node. Guess every current direction, solve, and one answer comes back negative - and that minus sign IS the answer. Then a meter goes in the wrong place, and the circuit stops being the one you built. Twelve short steps; press Next for each one.

12 STEPS · 6 QUICK CHECKS · GUESS FREELY · KEEP THE SIGN · METERS · v2

keep the minus sign · ammeter in line, voltmeter across
Before you start
What you're looking at
Three wires meeting at a node, with a guessed current arrow on each branch, drawn before anything is solved.
The question
What does a negative answer mean, and where must a meter go?
Step 1 / 12