electrical power, drift velocity and internal resistance

this is the 4 hyperlinks to questionshttps://isaacphysics.org/questions/bulbs_and_power?board=electrical_powerhttps://isaacphysics.org/questions/drift_velocity?board=resistivityhttps://isaacphysics.org/questions/finding_the_internal_resistance_sym?board=internal_resistancehttps://isaacphysics.org/questions/resistance_and_power?board=internal_resistanceI would really appreciate if you could send working out