A resistor R1 is wired to a battery, then resistor R2 is added in series.

(a) Is the potential difference across R1 now more than, less than, or the same as previously?

(b) Is the current i1 through R1 now more than, less than, or the same as previously?

(c) Is the equivalent resistance R12 of R1 and R2 more than, less than, or the same as R1?

A. more than

B. less than

C. same as

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.