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Wheatstone bridge is used for ………………… ....

Wheatstone bridge is used for ………………… .

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Kirchhoff.s Law
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The four arms as a Wheatstone bridge have the following resistances: AB =100Omega, BC =10 Omega, CD=5Omega and DA=60Omega A galvanometer of 15Omega resistacne is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 V is maintained across AC.

Three resistances P,Q,R each of 2 Omega and unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 Omega is connected in parallel to S the bridge gets balanced.What is the value of S ?

The resistance of the four arms P,Q,R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively.The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively.If the galvanometer resistance is 50 ohm, the current drawn from the cell will be

(a) In a meter bridge the balance point is found to be at 39.5cm from the end A. when the resistor S is of 12.5Omega. Determine the resistance of R. Way are the connections between resistors in a Wheatstone or meter bridge made of thick copper strips ? (b) Determine the balance point of the bridge above if R and S are interchanged. (c ) What happens if the galvanometer and cell are interchanged at the balance point of the bridge ? Would the galvanometer show any current ?

In wheat stone bridge circuit P=7, Q=8, R=12 & s+7. Find the additional resistance to be used in series with S, so that the bridge is balanced.

FULL MARKS-CURRENT ELECTRICITY-Additional Questions Solved (Fill in the blanks)
  1. With increase of temperature, resistance of conductors ……………………….. .

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  2. In insulators and semiconductors, as temperature increases, resistance...

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  3. A material with a negative temperature coefficient is called a …………………...

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  4. the temperature co-efficient of resistance for alloys is

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  5. The electric current in an external circuit flows from the ………………….. .

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  6. In the electrolytic cell, current flows from …………………. .

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  7. A freshly prepared cell has ………………… internal resistance.

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  8. State the sign convention for applying Kirchhoff's first rule.

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  9. The current law states that the algebraic sum of the currents meeting ...

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  10. Current law is a consequence of conservation of …………………….. .

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  11. Sate Kirchhoff's voltage rule.

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  12. Kirchhoff's second law is a consequence of conservation of …………….. .

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  13. Wheatstone bridge is used for ………………… .

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  14. ………………… is a form of Wheatstone's bridge.

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  15. The temperature coefficient of manganin wire is ……………….. .

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  16. Name the instrument which is used to measure potential difference.

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  17. The SI unit of electrical energy is .

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  18. An instrument to measure electrical power consumed is …………….. .

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  19. ………………… first introduced the electrochemical battery

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  20. Charging is a process of reproducing ………………….. .

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