why ohm's law is not applicable for ac circuit?

3 Answers

Ohm's law also applicable for AC circuit but in case of AC there is impedance Z. And in case of DC there is a resistance R.

in AC E=IZ

in DC V=IR
thumb_up_alt 0 like thumb_down_alt 0 dislike

Ohm's law is also applicable for AC circuit.

Ohm's law for AC circuit is given by, 

i = v / R = Vm sinωt/R

Where i and v is the instantaneous value of current and voltage.

thumb_up_alt 1 like thumb_down_alt 0 dislike
We can use Ohm's law for AC circuit if circuit consists of linear components and devices.
thumb_up_alt 0 like thumb_down_alt 0 dislike

Related questions

Answer : Ohm's law is not applicable to semi-conductors.

Description : Ohm’s law is applicable to : (A) Semi-conductors (B) Vacuum tubes (C) Electrolytes (D) Semiconductors and Vacuum tubes

Description : is Ohms law applicable to vacuum tubes?

Answer : Ohm's law is not applicable to vacuum tubes.

Answer : both ac as well as dc

Description : does ohm's law apply to ac circuits?

Answer : Yes it does, but as it is supplied with ac we will have to take impedance in account.

Description : State Ohm’s law for electric circuit.

Answer : Ohms law -States that the current flows in a circuit is directly proportional to the applied voltage (V) and inversely the proportional resistance provided with the temperature main constant

Description : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Answer : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : Does the linear circuit obey Ohm's law?

Answer : Yes linear circuit obey Ohm's law and nonlinear circuit not satisfied Ohm's law.

Description : State and explain Ohm's law for magnetic circuit.

Answer : Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

Description : About trnsformer

Answer : Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer

Description : Kirchhoff s law is not applicable to circuits with?

Answer : Kirchhoff's law is not applicable to circuits with distributed parameters.

Description : The Kirchoff's law for a.c. is applicable upon consideration of -  a) Phasor sum b) Algebraic sum c) Progression sum d) Linear sum

Answer : The Kirchoff's law for a.c. is applicable upon consideration of - Phasor sum

Answer : If the resistance of a conductor does not vary in accordance with Ohm's law it is known as non-linear conductor

Description : Ohm's law formula

Answer : Ohm's law formula

Description : State and explain Ohm’s law.

Answer : Ans: Ohm's law: As long as physical conditions (such as dimensions, pressure and temperature) are constant, the potential difference or voltage applied across the conductor is directly proportional to ... V/R where, R = constant of proportionality, called as the resistance of the conductor.

Description : According to Ohm's law:  (1) The voltage is constant to current (2) The voltage is proportional to current (3) Voltage is inversely proportional to current (4) The voltage is proportional to resistance

Answer : At constant temperature current passing through a conductor is directly proporstional to voltage across a conductor

Description : Which one of the following laws best describes the operation of an electric generator? w) Ampere's Law x) Gauss' Law y) Ohm's Law for Conductors z) Faraday's Law of Induction


Description : The condition for the validity under Ohm's law is that?

Answer : The condition for the validity under Ohm's law is that resistance must be uniform.

Description : Explain Dalton's law of partial pressure. How it is applicable to condenser?

Answer : It states that' The pressure exerted by mixture of air and steam is equal to sum of partial pressures, which each constitute would exert, if it occupies the same volume .  In condenser total ... mixture of air and steam Pa = Partial pressure of air Ps = Partial pressure of steam

Description : Kirchhoff s law is applicable to?

Answer : Kirchhoff s law is applicable to both a.c. as well d.c. circuits.

Description : Kirchhoffs current law is applicable to only?

Answer : Kirchhoffs current law is applicable to only junction in a network.

Description : Why are DC motors used in trains and not AC motors ?

Answer : The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

Description : when charging a battery we use a DC supply but not an AC supply. Why ?

Answer : When power is supplied to the battery, electrolyte inside the battery is divided into positive and negative ions, where ions with similar pole is gained in one side. This reactionʼs flow coincides with direct current.

Description : What law describes the force between two stationary electrically charged objects? w) Ampere's law x) Coulomb's law y) Kirchoff's Rules (pron: kir-koff rules) z) Ohm's law


Description : Induced electric currents can be explained using which of the following laws? w) Gauss's Law x) Faraday's Law y) Ohm's Law z) Ampere's Law


Description : The force acting between two point charges can be computed using which of the following laws? w) Ohm's Law x) Ampere's Law y) Coulomb's Law z) Newton's Second Law.


Description : Define charging, discharging, specific resistance and Ohm’s law.

Answer : Charging:- It is the operation of the cell in which external source of current reverses the electrochemical cell reaction in order to restore the battery to its original fully charged state. ... across the conductor & inversely proportional to the resistance (R) of a conductor. 

Description : The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as: (1) Avogadro’s law (2) Rault’s law (3) Ohms law (4) Faraday’s law

Answer : Ohms law

Description : Ohm’s law is valid in case of (1) semiconductor (2) conductor (3) superconductor (4) insulator

Answer : conductor

Description : Ohm's Law Fundamentals of Electrical Engineering  

Description : Ohm's law example

Answer : Ohm's law example

Description : Why is AC better for long distance power transmission than DC ?

Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

Description : Is vdr only applicable on series circuit

Description : For an RLC series AC circuit, the current at series resistance is (a) maximum at lagging power factor (b) maximum at leading power factor (c) maximum at unity power factor (d) minimum at unity power factor  

Description : Which ofthe following theorem is applicable for both linear and non-linear circuits?   A) Superposition theorem B) Thevenin’s theorem C) Norton’s theorem D) None of these

Description : Which is not applicable to vegetatively propagated plants a) To get true to type plants b) To protect an elite quality c) To conserve a plant d) To get a new type of plant

Answer : d) To get a new type of plant

Description : As per the Maternity Benefit Act, maternity benefits are NOT applicable in the following situation a) if the child is born outside wed-lock b) if the woman is unmarried c) none of the above

Answer : c) none of the above  

Description : Which one of the following principles is not applicable to sampling? (A) Sample units must be clearly defined (B) Sample units must be dependent on each other (C) Same units of sample should be used throughout the study (D) Sample units must be chosen in a systematic and objective manner

Answer : (B) Sample units must be dependent on each other

Description : Superposition theorem is not applicable to network containing: (1) Non linear element (2) Dependent voltage source (3) Dependent current source (4) Transformer. 

Answer : A

Description : An LED is operated on a 12 volt automobile circuit. The voltage drop across the LED is 2 volts and the current must be limited to 50 milliamps to prevent its overheating and destruction. What size resistor must be used? w) 60 ohms x) 100 ohms y) 120 ohms z) 200 ohms

Answer : ANSWER: Z -- 200 OHMS

Description : A circuit has a resistance of 200 ohms. The resistance of the circuit can be reduced to 120 ohms by adding which of the following to the circuit. w) 80 ohm resistor in series x) 150 ohm resistor in parallel y) 240 ohm resistor in series z) 300 ohm resistor in parallel


Description : Why is AC considered more efficient than DC?

Answer : Ac is more efficient than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transmission. When fault occurs it is easy to interrupt ac supply.

Description : Which is more dangerous AC or DC and why ?

Answer : Dc is more dangerous than Ac because in Ac the voltage  will varies but in dc the constant voltage 

Description : Why can't we store AC in batteries instead of DC ?

Answer : Because the direction of the current changes in AC electricity, you cannot directly store the power. Placing a capacitor in an AC circuit has no effect on the alternating flow of the electricity. The only ... is indirectly, by storing DC and then using a power inverter to convert the DC to AC.

Description : Why the Led Glow in Dc Supply ? Whenever give the Ac Supply What is Affect in Led ?

Answer : LEDs consume DC current to produce light; with AC current the LED will only be lit when current flow is in the proper direction. AC applied to an LED will cause it to blink on and off, and at high frequency the LED will appear to be lit continuously.

Description : Why does a transformer only work with an AC supply?

Answer : The transformer work depends on the induction as main principle ,for that AC is the right means

Description : Why do we use AC current in our homes?

Answer : We used it for cooking rice,  For washing clothes and for lights in the house.

Description : why ACcurrent is smaller than DC current

Answer : AC current is not always smaller than DC.

Description : Which method is not used for conversion of AC to DC? A. Motor-generator set B. Rotary converter C. Metal rectifiers D. Dynamometers

Answer : Dynamometers method is not used for conversion of AC to DC.

Description : Draw neat labeled diagram of AC track circuit. Also give two advantages of AC track circuit.

Answer : AC Track Circuit:  Advantages of AC Track Circuit: 1. Free from effects of stray currents. 2. Track circuit is up to a long length of track in one section length up to 3km to 5 km. 3. Cheaper in costs as compared to DC track circuit. 4. Easy to install than DC track circuit. 

← Prev Question Next Question →
editChoose topic