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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता १०

State Ohm’s law.

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प्रश्न

State Ohm’s law.

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उत्तर

According to Ohm’s law, at a constant temperature, the steady current ‘I’ flowing through a conductor is directly proportional to the potential difference ‘V’ between the two ends of the conductor.
I ∝ V
V = IR.

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पाठ 4: Electricity - Evaluation [पृष्ठ ५६]

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सामाचीर कलवी Science [English] Class 10 SSLC TN Board
पाठ 4 Electricity
Evaluation | Q VII. 3. | पृष्ठ ५६

संबंधित प्रश्‍न

Name the physical quantity whose unit is "ohm".


Tick(✓) the correct choice in the following:

Ohm's law is applicable to


State and define Ohm’s law.


Define ampere and volt with respect to Ohm’s law.


State the limitations of Ohm’s law.


Ohm’s law states the relationship between power and voltage.


The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.


An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω, and 92 Ω resistors available. How can she connect the available resistors to get the desired value of resistance?


Vinita and Ahmed demonstrated a circuit that operates the two headlights and the two sidelights of a car, in their school exhibition. Based on their demonstrated circuit, answer the following questions.

  1. State what happens when switch A is connected to:
    a) Position 2
    b) Position 3
  2. Find the potential difference across each lamp when lit.
  3. Calculate the current.
    a) in each 12 Ω lamp when lit.
    b) In each 4 Ω lamp when lit.
    OR
  4. Show, with calculations, which type of lamp, 4.0 Ω or 12 Ω, has the higher power.

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 and 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 tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare:

  1. the resistance in both the cases.
  2. the voltmeter readings in both the cases.
  3. the specific resistance in both the cases.

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