Dose Ohms law apply only to dc and not ac?

Answer 1

It applies directly to DC and only sort of to AC.

The problem with AC is the power. If you drive a perfect inductor or capacitor, you will have voltage and current, but no power. In real life, the load of an AC circuit has both reactance (capacitive or inductive) and resistance, so there will be power drawn, but in a more complex manner than simply P=IE.

The load is complex also, the inductance and capacitance are 180 degrees out of phase with each other and 90 degrees out of phase with a real (resistive) load. So when you add them you need to use trigonometry.

Don't even ask about RF circuits. It is another order of magnitude higher in difficulty.

Answer 2

Ohms law apply to both AC and DC, as:
V = R x I
The difference between AC and DC is that:
1. The value of R (resistance), is called Z (Impedence) and is the result of various calculations. ie: Z of a capacitor is 1 / omega x C.
2. V has different "values" depending of the shape of the current/voltage (ie: a sine wave, a square wave), and the means of measurements (ie: reading the AVERAGE voltage with a voltmeter, or the true "peek-to-peek" voltage with an oscilloscope.
So, the formulas to use in AC are a bit more complex (the "omega" above = 2 x PI x frequency for a sine wave)
But Ohms laws still apply to both AC and DC... Just more complicated.

Answer 3

Ohm's regulation does not stick to to AC circuits while reactance, or a minimum of while considerable reactance, exists interior the circuit. Or yet in a distinctive thank you to think of roughly it is that Ohm's regulation applies in elementary terms to the secure state

Answer 4

Ohms law says that current is in a circuit directly proportional to the voltage and inversely proportional to the resistance if the temperature is kept constant.

Answer 5

it applies to both