A farad is defined as the amount of capacitance necessary for: A. dissipating 1 W of power B. causing an ac phase shift greater than 90 degree C. storing 1 V for 1 second D. changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing E. None of the above

The correct answer is: C. storing 1 V for 1 second

A farad is a unit of capacitance, which is the ability of a capacitor to store an electric charge. The capacitance of a capacitor is proportional to the area of its plates and inversely proportional to the distance between them.

The amount of capacitance necessary to store 1 V for 1 second is 1 farad. This is because the charge stored in a capacitor is equal to the product of the capacitance and the voltage across it. In this case, the voltage is 1 V and the capacitance is 1 farad, so the charge stored is 1 C.

The other options are incorrect because they do not describe the function of a capacitor. Option A is incorrect because a farad is not a unit of power. Option B is incorrect because a farad does not cause an ac phase shift greater than 90 degrees. Option D is incorrect because a farad does not change