I've seen lots of videos on resistors, but they all calculate voltage drop after multiple resistors. Let's say I have a series circuit, with a 12 volt battery bank and a 8 ohm resistor, nothing else in the circuit. If I use ohms law to find the amperage (12/8 which means the amperage is 1.5 amps), then multiply amps by total resistance (which is 8), I get, of course, 12 volts. Is that the voltage after the resistor or the voltage drop, and why is it the same amount as the input?

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.