a portable cd player uses a current of 7.50 mA and has a resistance of 465 ?.
a) What potential difference has been applied to the player?
b) If the player uses 24-gauge wire (A= 0.20 mm2) with a length of 6.50 cm, what is the resistivity of the wire?
c) How much energy does the player use in 48.0 s?