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 &#10;positive terminal of one cell should be connected with negative terminal&#10; 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 \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 5

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 6

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 7

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.

Question 8

In the electric circuit shown in the figure, label the parts A, B, C, D, E , and F. State the function of each part. Show in the diagram the direction of flow of current.

Accepted Answer

The diagram shows the direction of flow of current and the labeling - A, B, C, D, E and FThe function of each part is as follows:A- A is the Ammeter, which measure the flow of current in the circuitB- Cell: acts as a source of direct current for the circuitC- key: Key puts the current, on and off in the circuitD - Load: load is an appliance connected in a circuit which can be a combination of different electrical components or a resistance (bulb).E - Voltmeter: It measures the potential difference between two points of a circuit.F - Rheostat: it controls the flow of control in a circuit

Question 9

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 10

(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)&#10; Closed electric circuit: The circuit in which electric current flows &#10;from one terminal of a cell or battery to the other is called as closed &#10;circuit.

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