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Question
Sun December 16, 2012 By: Arvind Bala

# Circuits

Sun December 16, 2012
Suppose a group of resistances have a same potential difference across them, then they are said to be in parallel.
and if a group of resistances are connected end to end, and their combination is collectively connected across a potential difference, thn thy are said to be in series.
In short circuit, the resistance in a circuit becomes zero and hence for a given potential, the current increases manyfold.
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# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016

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