मराठी

Calculate the Effective Resistance Across Ab ?

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प्रश्न

Calculate the effective resistance across AB?

टीपा लिहा
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उत्तर

5 Ω and 4Ω are in series


∴ R1 = (5 + 4)Ω = 9Ω  

Now, 9Ω and 3Ω are in parallel
`therefore R_2 = (9 xx 3)/(9+3)=9/4Ω`
Now, 2 8Ω and R2 are in series 

`therefore R_3 = 8 +9/4 =41/4 Ω= 10.25Ω`

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2018-2019 (March) Set 1

संबंधित प्रश्‍न

Ohm's law gives a relationship between:

(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference


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(a) one-fourth
(b) four time
(c) half
(d) double


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Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m


Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.


What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.


Answer the following question.

Distinguish between Ohmic and non-ohmic substances; explain with the help of example.


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.


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.

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