# So, i can find my notes and need help. like, now please

## Main Question or Discussion Point

alright so i just found out ive got a physics test tomorrow and i cant find my notes. can somebody help explain the rules for parallel and series circuits and how to solve them for current, voltage, and resistance? i think thats all i need..

ps-this is my first post so yay! maybe this will keep me from failing =)

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alright so i just found out ive got a physics test tomorrow and i cant find my notes. can somebody help explain the rules for parallel and series circuits and how to solve them for current, voltage, and resistance? i think thats all i need..

ps-this is my first post so yay! maybe this will keep me from failing =)
Signing up to a new forum the night before your exam is likely provide much more of a distraction than a learning aid.

right.. but i googled those questions and links to this forum came up. only they were just answers to some kid's homework, so it didnt really help.

Read up on Kirchoff's laws (junction and loop rule) -- Also I'm assuming you have a book? Read it and do practice problem.

Also try looking up parallel and series resistors, doesn't sound like you're doing capacitors yet.

Basically in a circuit we have a voltage source, it increases the voltage and everything else (resistors, capacitors, etc) can be thought of as decreasing the voltage. So if you write everything out in terms of voltage the equations should equal 0. Just make multiple loops around the circuit until you have as many equations as unknowns, then just solve.

Read up on Kirchoff's laws (junction and loop rule) -- Also I'm assuming you have a book? Read it and do practice problem.

Also try looking up parallel and series resistors, doesn't sound like you're doing capacitors yet.
Seconded...these are more commonly referred to as the KVL and KCL

http://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws

Also make sure you know Ohm's Law and the rules for adding resistors in parallel and series is described here

http://en.wikipedia.org/wiki/Series_and_parallel_circuits

Integral
Staff Emeritus
Gold Member
The general rules are:

For series circuits:
1. The current is the same for all elements.
2. The voltage drops sum to the source voltage.