AP Physics C E and M

Question

A 15 V constant voltage battery is connected to 120 kΩ resistor. A 15 V constant voltage battery is connected to 120 kΩ resistor.

1) What is the current in the resistor in [mA]?

Multiple Choice question

2) How many electrons pass through the resistor each second?

a) 7.8x10¹⁴ electrons

b) 1.25x10^-4 electrons

c) 1.6x10^-19 electrons

Answer 1

HI

use I = V÷R to find the current in amp then multiply by 1000 to convert the answer to mA.

use I = q/ t ,(t= 1 s) to find q in coulomb then divide the answer by the charge of electron which equal 1,6 ×10^-19 c.