Anil Ahlawat Solutions for Chapter: Electricity, Exercise 1: EXERCISES

Which of the following statements about the current in given circuit is correct?

An electric bulb rated $220 \mathrm{V}, 60 \text{W}$ is working at full efficiency. Another identical bulb is connected in the same circuit having power supply of $220 \mathrm{V}$.
(i) If both the bulbs are connected in series then the total power consumption will be $60 \mathrm{W}$.
(ii) If only one bulb is connected then the total power consumption will be $30 \mathrm{W}$
(iii) If the both bulbs are connected in parallel then the total power consumption will be $120 \mathrm{W}$.
Which of the above statement (s) is/are correct regarding the circuit?

How will be the reading in the ammeter A affected if another identical bulb $Q$ is connected in parallel to $P$ ? (The voltage in the mains is maintained at a constant value.)

Six equal resistances are connected between points $P, Q$ and $R$ as shown in the figure. The net resistance will be maximum between :

Arrange the order of power dissipated in the given circuits, if the same current enters at point $A$ in all the circuits and resistance of each resistor is $R$.

$\left(\mathrm{i}\right)$ 

$\left(\mathrm{ii}\right)$ 

$\left(\mathrm{iii}\right)$ 

$\left(\mathrm{iv}\right)$ 

While carrying out an experiment, to find the equivalent resistance of two resistances connected in parallel, a student sets up the circuit as shown. The teacher checks it and tells him that his circuit has one or more of the following ‘faults’.

(i) The resistors $R_1$ and $R_2$ have not been correctly connected in parallel.
(ii) The voltmeter has not been correctly connected in the circuit.
(iii) The ammeter and the key have not been correctly connected in the circuit. Out of these three, the actual fault in his circuit is/are :
 

Observe the given circuit diagram and answer the following questions.

What is the value of current shown by the ammeter?

Observe the given circuit diagram and answer the following questions.

What is the potential difference across $2 \mathrm{\Omega }$?