What is the voltage measured with a voltmeter across a wire in a circuit?

a) the voltage is the same as the voltage across the power source
b) the voltage is half of the voltage of the power source
c) the voltag is zero
d) a voltmeter cannot measure the voltage across a wire

On a hot saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 22degreesc. at noon the air conditioner is turned off, and the people go home. the temperature outside is a constant 33degreesc for the rest of the afternoon. if the time constant for the building is 4 hr, what will be the temperature inside the building at 4 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? at 6 : 00 font size decreased by 2 upper p . font size decreased by 2 upper m .? when will the temperature inside the building reach 24degreesc? 324281