Fill in the gaps for the unknown Voltage and current readings G10 – for a S & P circuit know about I & V b) G11 - for a S Ω P circuit know about: I, V I R R calculations Complex S & P circuits c) d) e)

Success criteria… Can YOU determine the current in each branch and Voltage drops across each resistor? G11: What is voltage drop (or potential difference) across each component and the current in each circuit branch?

Simple Series Circuit RT = 60 W Cut the resistor into three equal lengths and then separate. IT = 2 A VT = 120 V

Simple Series Circuit RT = 60 W I1 = 2 A I2 = 2 A I3 = 2 A R1 = 20 W R2 = 20 W R3 = 20 W V1 = 40 V V2 = 40 V V3 = 40 V IT = 2 A VT = 120 V

V & I in a (series) circuit

Equivalent Series Resistance 12 W a b 4 W 8 W a b

Ex: 47  V 28  The current through the 47  resistor is 0.12 A Calculate the voltage V of the battery.

Parallel Circuit RT = 60 W IT = 2 A Cut the resistor in half and then separate. VT = 120 V

Parallel Circuit RT = 60 W IT = 2 A VT = 120 V

Equivalent Parallel Resistance 6 W 30 W a b 5 W a b R1 For two Resistors in Parallel R2 a b

Ex: V 47  28  The current through the 47  resistor is .12 A Calculate the current through the 28  resistor.

Series / Parallel combinations 5 W 2 W a b 3 W 3 W 6 W a b

V & I in a (Parallel) circuit Why is this model now a fail? :O(

How to calculate the equivalent resistance for a group of resistors: