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What is ohmic device?

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प्रश्न

What is ohmic device?

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उत्तर

Materials for which the current against voltage graph is a straight line through the origin, are said to obey Ohm’s law and their behaviour is said to be ohmic.

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पाठ 2: Current Electricity - Evaluation [पृष्ठ १२०]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
पाठ 2 Current Electricity
Evaluation | Q II. 6. | पृष्ठ १२०

संबंधित प्रश्‍न

If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.

  1. 0.2 A
  2. 0.5 A
  3. 2 A
  4. 5 A

State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it. 


A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?


An ammeter placed in series with an electric radiator reads 0.5 amps and a voltmeter placed across it reads 230 volts. What is the resistance of the radiator?


A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is


Write a short note on superconductors?


The slope of voltage (V) versus current (I) is called:


Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is ______.


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 voltage - current readings of a certain material are shown in the table given below:

Voltage (V) 10 V 20 V 30 V
Current (I) 2 A 3 A 4 A

Study the table.

  1. State whether the conductor used is ohmic or non-ohmic.
  2. Justify your answer.
  3. State Ohm's law.

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