Electrical Symbols - Intermediate

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

The symbols of circuit components are:

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

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.

Q: 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.

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.

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

Q: 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.

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

Q: A rheostat is used in an electrical circuit

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.

Q: Symbol of electric cell is -

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

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

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

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

(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.

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

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.

Physics

example

Symbols of components

Symbols of various components are shown in the attached figure.

definition

Types of Electric Circuits

Simple Circuit: A circuit made up of a cell, a switch and

a bulb is known as a simple circuit.
Series Circuit: A circuit where bulbs are connected end to end. This type of circuit is known as series circuit.Here the current can flow only in one direction and the same amount of electric current flows through all the bulbs.
Parallel Circuit:Here each bulb is connected to the battery terminals by separate wires. This type of circuit is known as parallel circuit.In this circuit, different amount of current passes through the bulbs.