ADVANCED LESSON 14logomidi2.gif

             
LEARNING  OBJECTIVES and NOTES 
Resistors in series and parallel
Understand and apply the formulae for calculating the combined values of resistors in series and/or in parallel. Resistors of different values may be used in series, parallel or combined series and parallel circuits.

Resistors in series. If resistors are connected in series, then their total resistance is found by adding the value of each resistor. So for 3 resistors R Total

Form_RinSeries2.gif

Remember the symbol for an Ohm is Ω
Resistors%20in%20Series2.gif

Example 1

Click "next step" to see the stages in the calculation.

calc_series_resistors2.gif

Resistors in parallel
If resistors are connected in parallel, then their total resistance is found from the formula:

Form_ResistrosinParallel.gif

(NB as a check the total resistance will always be less than the smallest value of resistor)

 resistorsin%20parallel2.gif
Example 2

Click "next step" to see the stages in the calculation.  

calc_resistorsinparallel.gif


Example 3

Click "next step" to see the stages in the calculation. 
calc_resistorsinseriesandparallel.gif