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प्रश्न
What is non ohmic device?
उत्तर
Materials or devices that do not follow Ohm’s law are said to be non-ohmic.
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संबंधित प्रश्न
Graph showing the variation of current versus voltage for a material Ga As is shown in the figure. Identify the region of
(i) negative resistance
(ii) where Ohm's law is obeyed.
Name the physical quantity whose unit is "ohm".
Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:
(a) one-fourth
(b) four time
(c) half
(d) double
- Draw a V-I graph for a conductor obeying Ohm’s law.
- What does the slope of V–I graph for a conductor represent?
In the circuit shown in the figure, find the total resistance of the circuit and the current in the arm AD.
Define the following:
(i) Coulomb
(ii) Ohm
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?
The circuit depicted in the figure is employed for studying Ohm's Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes E1 & E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills the tube 2.
Neglecting internal resistance of the cell use (> or < or =) to compare
- the resistance in both the cases.
- the voltmeter readings in both the cases.
- the specific resistance in both the cases.
A current of 3.2 mA flows through a conductor. If charge on an electron is - 1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
