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# Introduction to Series and Parallel Circuits

Mr. Nale's per. 8/9 Class 2012
by

## Lisa Dovi

on 27 March 2014

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#### Transcript of Introduction to Series and Parallel Circuits

Series and Parallel Circuits
Series Circuits
Properties of a Series Circuit
Parallel Circuits
Resistive Elements (resistors) are connected between two points (called nodes)
Properties of Parallel Circuits
Resistive Elements (resistors) are connected end-to-end in one line
One Path for electrons to flow
CURRENT
Properties of a Series Circuit
VOLTAGE
Properties of a Series Circuit
RESISTANCE
CURRENT
Properties of Parallel Circuits
VOLTAGE
Properties of Parallel Circuits
RESISTANCE
Many paths (at least two) for electrons to flow
Current follows in a single path
Current is the same in each resistor
The total potential difference, V, at the terminals must equal the sum of the separate potential differences across each resistors.
Each resistor only gets a portion of the total voltage.
The total resistance is the sum of each individual resistor.
The total resistance is greater then the largest resistor.
Current has more than one path.
Current is divided among resistors.
The sum of the current in each branch is equal to the total.
The same potential difference exists across each resistor.
Each resistor gets the same voltage
The total resistance is less than the smallest resistor
Draw another example...
Draw another example...
Electrical Meters
Ammeters
Measure ______________
- Have ______ resistance, like a bare wire. Can cause a short circuit!
- To connect: break the circuit where you want to measure current and insert the ammeter.
- Do NOT split the path of the electrons and make a new way for current to flow.
DRAW IT!

Electrical Meters
Voltmeters
Measure ________________
- Have _______ resistance, act like a big resistor (can almost stop current)
- To connect: place one lead (wire) on each side of the potential difference you wish to measure.
- Do NOT break your original complete circuit.
DRAW IT!

Whats the total resistance (equivalent resistance) of a circuit with a 3 ohm, 4 ohm, and 5 ohm resistor connected in parallel, in which 7.05 amps flow from the 9V battery?
The TOTAL resistance is called the...
Equivalent Resistance
Solving Problems involving Series & Parallel Circuits
Rules:
1. Identify circuit elements in Series and/or parallel
If series, I is the same everywhere
If parallel, V is the same everywhere
2. Find Req if you can for those elements

3. Use V=IR (I=V/R or R=V/I) where you can

P= VI
Full transcript