Q. The circuit shown in figure- is closed at . Calculate the total amount of heat generated in during the time capacitor gets fully charged:

Current Electricity Report Error

A

B

C

D

Solution:

Current in will be half of the current in transient duration which charges the capacitor and it is given as

Heat produced in resistor is given as

Above heat can also be directly calculated as total heat dissipated is half of the work done by the battery in above case and heat is distributed in same ratio of resistances in the two resistances and in series. Students are advised to verify the result using this method also.

Questions from Current Electricity

1. Two sources of equal emf are connected to an external resistance . The internal resistances of the two sources are and If the potential difference across the source having internal resistance , is zero, then :

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2. In the network shown in figure, each resistance is equal to . The resistance between the points and is

3. A letter ' ' is constructed from a uniform wire with resistance per The sides of the letter are and the cross piece in the middle is long. The apex angle is The resistance between the ends of the legs is

4. The diagrams show five different ways in which currents can combine at a junction.

For which of these junctions, is the following equation correct ?

5. A battery of emf, is connected to resistances as shown in figure. The potential difference between the points and is

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