One wall of a house consists of 0.019 m thick plywood backed by 0.076 m thick insulation. The temperature at the inside of the house is 25 degrees celsius, while the temperature on the outside of house is 4 degrees celsius, both being constant. The thermal conductivities of the insulation and plywood are 0.030 and 0.080, respectively and the are of the wall is 35m^2. a) Find the temperature at the plywood/insulation interface, assuming that no heat escapes from the system.
b) Find the quantity of heat conducted through the wall in one hour.

The best description is: . nobody has any idea what q is.

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current