Which of the following is characteristic of a parallel circuit?
there is more than one path for the electrons to take.
there are at least two power sources and at least two receivers.
all parts of the circuit are connected one after the next.
each part of the circuit is on a different branch.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.