Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electricity, Exercise 23: Long Answer Type Questions

With the help of a circuit diagram, deduce the equivalent resistance of two resistances connected in series.

Two resistances are connected in series as shown in the diagram:

(i) What is the current through the $5 \mathrm{ohm}$ resistance?
(ii) What is the current through $R?$
(iii) What is the value of $R?$
(iv) What is the value of $V?$

With the help of a diagram, derive the formula for the resultant resistance of three resistors connected in series.

For the circuit shown in the diagram given below:

Calculate:
(i) the value of current through each resistor.
(ii) the total current in the circuit.
(iii) the total effective resistance of the circuit.

With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.

In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter $A$

Explain with the help of a labelled circuit diagram, how you will find the resistance of a combination of three resistors of resistances $R_1,R_2$ and $R_3$ joined in parallel.

In the diagram shown below, the cell and the ammeter both have negligible resistance. The resistors are identical.

With the switch $K$ open, the ammeter reads $0.6 \mathrm{A}$. What will be the ammeter reading when the switch is closed?