Chapter 56 of 2363 min read
Kirchhoff's rules, Wheatstone bridge, potentiometer
Why this is asked: A potentiometer's advantage over a voltmeter is that, at balance, it draws zero current from the cell being measured, while a voltmeter always draws some and reads slightly low. In a balanced Wheatstone bridge, only the galvanometer branch carries zero current.
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- •A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is:
- •The current passing through the battery in the given circuit is:
- •Choose the correct circuit (from the four given) which can achieve the bridge balance.
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