Why is a resisitor considered ohmic?

Question

Please give a detailed responses. It would be appreciated if you use examples.

Answer 1

Pure resistors obey Ohm's law & they are said to be ohmic... But some of the other circuit elements can have inductances & capacitance & hence not considered as ohmic.

Simple defn of Ohm's law. ==>

V = I*R
If the temperature & other physical conditions remains the same the votage(V) across resistor is propotional to the current(I) flowing across it. The propotionality constant (R) is known as the resistance...

Answer 2

Because it produces a linear response of voltage drop across it as the current increases. Said another way, it produces a linear response of current flow as voltage is either increased or decreased through it. This gives rise to the formulas:

I = V/R or V = IR

If these are plotted with I on the Y-axis and V on the X-axis, you get a line, hence the linear response.

Now not all resistors are ohmic. A lightbulb filament has sort of a parabolic response and it is NOT linear. You can do this experiment with a 12V power supply, 12V car lightbulb, and an ammeter. As you raise the voltage across the lightbulb, measure the current flowing. So when you plot I versus V, you will not get a straight line as you would if you had a simple resistor in the circuit.

Answer 3

A material is considered Ohmic if the voltage that results from a current flowing through it depends linearly on the current and is independent of frequeuncy - ie it obeys Ohms law in the simplest sense possible.

Most materials are not Ohmic. Large currents produce deviations from Ohms law. Very small currents can become dominated by noise (particularly for carbon resistors).

Commercial resistors are designed to behave as close to Ohmically as possible. But all suffer from limitations (carbon resistors from noise, wire wound resistor from frequency dependence).

Answer 4

resistors and ohmic devices are almost same. if a material is governed or satisfies ohms law(voltage = current x Resistance) then that is a resistor or ohmic material. A resistor got its name for resisting or hurdling or opposing the flow of electrons. in doing so it gets a lot of energy from the moving electrons, electrons try to pass through the resisting material by expending some energy given to them by the source. this energy is dessipated in the form of light or heat. from the source end resistor is considered to consume the energy, energy being supplied to it through the electrons. since ohms law is explaining how much current (charge passing per second) is allowed through the reistance material the objects or substances are considered to be ohmic. A ohmic material is one which consumes energy.
electrons expend energy to pass through the resisting material. the best example is a road. if the road is clean and in good condition, the amount of fuel and time need to drive the strech of it will be less and the vehilcle can be driven easily. think of the same road of same length in a very bad condition( with diches very big in size) the time taken will be more. we always try to avoid the diches and so the vehicle will be driven at a slower pace and in a jig jag fashion thereby increasing the distance travelled for the same displacement. this inturn increases the time of travel and fuel consumption. if more fuel is consumed for the same displacement it means that more energy is required for passing through the strech. on the other hand we can say the the good road consumes less energy and the bad road consumes more energy. the good road is an example for conductor ( a material with less opposition for charge or current flow) and the bad road a resistive or ohmic material . the length, the condition (resistivity) decide how much trafic cud be allowed and how much energy is consumed to pass that through the road.

an electron also move the same way as a vehile on the bad road.

Answer 5

The unit of electrical resistance was named the OHM in honour of German Physicist Ohm Georg Simon.
All conductors resist the flow of current to some extent. The measurement of a conductor's resistance to electric current is measured in Ohms.
Ohms Law: I (current) = V(voltage)/R(resistance)

Answer 6

pure resistance.

other resistive elements can have inductance and/or capacitance associated with them.

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