Q: In the circuit shown, a meter bridge is in its balanced state. The meter bridge wire has a resistance 0.1 ohm/cm. The value of unknown resistance X and the current drawn from the battery of negligible resistance is

Resistance of the part AC R_{AC}=0.1 \times 40= 4 \Omega and R_{CB}=0.1 \times 60= 6 \Omega In balanced condition \dfrac{X}{6}=\dfrac{4}{6} \Rightarrow X=4 \Omega Equivalent resistance R_{eq}=5 \Omega so current drawn from battery i=\dfrac{5}{5}=1\ A

Question 1

Draw the symbols of the following circuit components.i) Electric cellii) Switch in off positioniii) Electric bulbiv) Battery

Accepted Answer

The symbols of circuit components are:

Question 2

Identify the circuit (Figure 12.3) in which the electrical components have been properly connected

Accepted Answer

Hint: Check the connections of the Voltmeter and Ammeter.Step 1: Checking if the Voltmeter is connected in parallel and Ammeter is connected in series.   In circuits  (i)  and  (iii) , Voltmeter is connected in series. In circuit  (iii)  the ammeter is connected in parallel. In circuits  (i)  and  (iii) , connections are not proper. In circuits  (ii)  and  (iv) , the Voltmeter and Ammeter are connected in parallel and series respectively. Step 2: Checking if the terminals are connected properly.   In circuit  (iv) , the positive terminal of the ammeter is connected with the negative terminal of the cell. Hence it is not proper. Whereas in circuit  (ii) , all the terminals are properly connected. Therefore option  (B)  is the correct option.

Question 3

The bulb in the circuit shown in figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Accepted Answer

Problem in this circuit is the combination of two cells. In the circuit 
positive terminal of one cell should be connected with negative terminal
 of other to make the bulb glow.

Question 4

In the circuit shown, a meter bridge is in its balanced state. The meter bridge wire has a resistance 0.1 ohm/cm. The value of unknown resistance X and the current drawn from the battery of negligible resistance is

Accepted Answer

Resistance of the part  AC R_{AC}=0.1 	imes 40= 4 \Omega   and  R_{CB}=0.1 	imes 60= 6 \Omega  In balanced condition  \dfrac{X}{6}=\dfrac{4}{6} \Rightarrow X=4 \Omega Equivalent resistance  R_{eq}=5 \Omega  so current drawn from battery  i=\dfrac{5}{5}=1\ A

Question 5

Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the 'OFF' position, bulb, cell, switch in the 'ON' position and battery.

Accepted Answer

REF.Image.connecting wiresSwitch in 'on' positionBulbCellSwitch in 'off' positionBattery

Question 6

A rheostat is used in an electrical circuit

Accepted Answer

A rheostat is a variable resistor which is used to control current. they are able to vary the resistance in circuit without interruption. the construction of a rheostat is very similar to potentiometer .Thus A rheostat is used in circuit to change the resistance of the circuit. so option correct is A.

Question 7

Symbol of electric cell is -

Accepted Answer

(A) This symbol represents bulb(B)This symbol represents electric cell(C)This symbol represents closed switch(D)This symbol represents open switch

Question 8

Where should we place the key or switch in the electric circuits?

Accepted Answer

The key or Switch can be placed anywhere in the electric circuit.

Question 9

(1) what is electric circuit?(2) How many types of electric circuit are there? Define them.

Accepted Answer

(1) The diagram that shows the path of electric current is called electric circuit.(2) There are two types of electric circuit.(a) Open electric circuit.(b) Closed electric circuit(a) Open electric circuit: The circuit in which electrical contact at any point is broken is called open electric circuit.(b)
 Closed electric circuit: The circuit in which electric current flows 
from one terminal of a cell or battery to the other is called as closed 
circuit.

Question 10

State whether true or false :When current flows through a circuit, the circuit is called open circuit.

Accepted Answer

When current flows through the circuit, the circuit is called an open circuit.This statement is false as current does not flow in open circuit. When current flows, a circuit is called a closed circuit.

Simple Electrical Circuits

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Important Questions

Draw the symbols of the following circuit components.
i) Electric cell
ii) Switch in off position
iii) Electric bulb
iv) Battery

Identify the circuit (Figure 12.3) in which the electrical components have been properly connected