63. ssm A 14- coffee maker and a 16- frying pan are connected in series across a 120-V source of voltage. A 23- bread maker is also connected across the 120-V source and is in parallel with the series combination. Find the total current supplied by the source of voltage.

The total current will be the sum of the two currents needed, one for each branch.  For the coffee maker and frying pan we have two resistances in series, so we can just add them and get a total resistance for that branch as 30 Ω.  The current for that branch is then found from Ohm’s law

 

 

Similarly for the bread maker

 

 

 

Alternatively could find total resistance adding Rcoffee-fry to Rbread as two resistors in parallel

 

 

 

And current is found from

 

 

 

 

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This page last updated on June 18, 2018