Embibe Experts Solutions for Chapter: Electricity, Exercise 1: CBSE-2019

Show how would you join three resistors, each of resistance $9 \mathrm{\Omega }$, so that the equivalent resistance of the combination is $13.5 \mathrm{\Omega }$.

Show how would you join three resistors, each of resistance $9 \mathrm{\Omega }$, so that the equivalent resistance of the combination is $6 \mathrm{\Omega }$.

Write Joule's law of heating.

Two lamps, one rated $100 \mathrm{W}; 220 \mathrm{V}$, and the other $60 \mathrm{W}; 220 \mathrm{V}$, are connected in parallel to electric mains supply. Find the current drawn by two bulbs from the line, if the supply voltage is $220 \mathrm{V}$. 

How will you infer with the help of an experiment that the same current flows through every part of a circuit containing three resistors in series connected to a battery?

Consider the given circuit and find the current flowing in the circuit and potential difference across the $15 \mathrm{\Omega }$ resistor when the circuit is closed.

Three resistors $R_1, R_2$ and $R_3$ are connected in parallel and the combination is connected to a battery, ammeter, voltmeter and key. Draw suitable circuit diagram and obtain an expression for the equivalent resistance of the combination of the resistors.

Calculate the equivalent resistance of the following network: