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Chapter 10 - Coggle Diagram

- - - - ∑ℰ = ∑V around a closed loop
  - - - If the components have the same resistance, then e.m.f will be shared equally
      - if the components do not have the same resistance, the comonent with the greater proportion of resistance will take a greater proportion of e.m.f
      - when there are multiple surces of e.m.f, we must add the values of e.m.f, and then share between the components
        
        if the sources are in reverse polarity we must subtract the e.m.fs
  - - - the sum of the p.d.s of components across each branch = the total e.m.f
    - - the higher the resistance of a branch, the lower the current that passes through it.
- - - - original graph where V = -rI + e.m.f:
        
        double e.m.f but oringinal internal resistance:
        
        original e.m.f but half the internal resistance:
    - - by using this circuit, we can record values for terminal p.d. for different values of current and use the variable resistor to change the resistance of the cicuit, drawing different currents from the power source
        
        sketch the graph of e.m.f = VIr rearranged to V = -rI + e.m.f, and you will see that as the current through the cell increases, the terminal p.d. drops and the lost volts increase.
        
        When the current is zero the terminal p.d. is equal to the e.m.f, but as the current increases, so do the lost volts
        
        do not allow the current to high or it will raise the temperature of the cell and increase the internal resistance which we do not want in this experiment
  - - - ℰ = lost volts + terminal p.d.
        
        increasing the current increases the lost volts as the increased current means that more charges travel through the cell each second so more work is done by the charges
      - ℰ= V + Ir
        
        ℰ= IR + Ir
        
        ℰ=I(R+r)
    - - r is the internal resistance
- - - - even split of resistance means an even split of voltage