Question

what is the difference between normal glowing bulb and the bulb used in remote ?​

Answer 1

Answer:

Y

ou might have tried the game

‘How steady is your hand?’

suggested in Chapter 12 of

Class VI. If not, you may try it out now.

Paheli and Boojho had also set up the

game by connecting an electric circuit

as suggested in Class VI. They had lots

of fun trying it out with their families

and friends. They enjoyed it so much

that they decided to suggest it to a

cousin of theirs who stayed in a

different town. So, Paheli made a neat

drawing showing how the various

electric components were to be

connected (Fig.14.1).

Fig. 14.1 Setup to check how steady

your hand is

Can you draw this circuit

conveniently? It made Boojho wonder if

there was an easier way to represent

these electric components.

14.1 SYMBOLS OF ELECTRIC

COMPONENTS

Some common electric components can

be represented by symbols. In Table 14.1,

some electric components and their

symbols are shown. You may come

across different symbols for these

components in different books. However,

in this book, we shall be using the

symbols shown here.

Look at the symbols carefully. In the

symbol for the electric cell, notice that

there is a longer line and a shorter but

thicker parallel line. Do you recall that

an electric cell has a positive terminal

and a negative terminal? In the symbol

of the electric cell, the longer line

represents the positive terminal and the

thicker, shorter line represents the

negative terminal.

For a switch the ‘ON’ position and

the ‘OFF’ position are represented by the

symbols as shown. The wires used to

connect the various components in a

circuit are represented by lines.

In Table 14.1, a battery and its

symbol are also shown. Do you know

what a battery is? Look at the symbol of

a battery. Can you make out what a

battery could be? For some of the

activities we may need more than one

cell. So, we connect two or more cells

together as shown in Fig.14.2. Notic

Explanation:

Answer 2

Explanation:

The typical incandescent light bulb contains a thin wire (usually tungsten) called a filament that has a high electrical resistance. This filament gets very hot when an electric current passes through it. The intense temperature makes the filament glow brightly

The main technology used in home remote controls is infrared (IR) light. The signal between a remote control handset and the device it controls consists of pulses of infrared light, which is invisible to the human eye but can be seen through a digital camera, video camera or a phone camera.