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Questions and Answers
Boojho wondered if there was an easier way to represent these electric ______.
Boojho wondered if there was an easier way to represent these electric ______.
components
Many devices, such as torches and toys, use ______.
Many devices, such as torches and toys, use ______.
batteries
The terminals of the cells are usually connected by a thick wire or a metal ______.
The terminals of the cells are usually connected by a thick wire or a metal ______.
strip
In order to help place the cells correctly, ‘+’ and ‘–’ ______ are printed.
In order to help place the cells correctly, ‘+’ and ‘–’ ______ are printed.
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We can connect two or more ______ together as shown in figures.
We can connect two or more ______ together as shown in figures.
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Sometimes the cells are placed ______ by side in a battery compartment.
Sometimes the cells are placed ______ by side in a battery compartment.
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A cell holder can be made using a wooden block, iron strips, and ______.
A cell holder can be made using a wooden block, iron strips, and ______.
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The switch can be in ‘ON’ or ‘______’ position.
The switch can be in ‘ON’ or ‘______’ position.
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A combination of two or more cells is called a ______.
A combination of two or more cells is called a ______.
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In a battery, the positive terminal of one cell is connected to the ______ terminal of the next cell.
In a battery, the positive terminal of one cell is connected to the ______ terminal of the next cell.
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To make a battery, you can use a cell holder with metal clips and ______ to connect the cells.
To make a battery, you can use a cell holder with metal clips and ______ to connect the cells.
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The symbol used for representing a battery is shown in ______.
The symbol used for representing a battery is shown in ______.
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The ______ glows only when the switch is in the ‘ON’ position.
The ______ glows only when the switch is in the ‘ON’ position.
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You can buy ______ from the market for making batteries of two or more electric cells.
You can buy ______ from the market for making batteries of two or more electric cells.
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Place the cells in the holder properly, ensuring the positive and negative terminals are ______.
Place the cells in the holder properly, ensuring the positive and negative terminals are ______.
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You used a similar circuit in Class VI to make an electric ______ glow.
You used a similar circuit in Class VI to make an electric ______ glow.
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Batteries used in tractors, trucks, and inverters are made from ______.
Batteries used in tractors, trucks, and inverters are made from ______.
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An electric circuit can be represented by its circuit ______.
An electric circuit can be represented by its circuit ______.
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The bulb glows only when the switch is in the '______' position.
The bulb glows only when the switch is in the '______' position.
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When the bulb gets fused, its ______ is broken.
When the bulb gets fused, its ______ is broken.
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Never touch a lighted electric bulb connected to the ______.
Never touch a lighted electric bulb connected to the ______.
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Experimenting with electric supply from the mains may result in an electric ______.
Experimenting with electric supply from the mains may result in an electric ______.
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It is easier to draw a circuit using ______.
It is easier to draw a circuit using ______.
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The diagram shown in Fig. 10.8 is compared with the diagram shown in Fig. ______.
The diagram shown in Fig. 10.8 is compared with the diagram shown in Fig. ______.
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Incandescent electric bulbs are often used for ______ but they also give heat.
Incandescent electric bulbs are often used for ______ but they also give heat.
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Fluorescent tube-lights and compact fluorescent lamps (CFLs) are better electricity ______ lighting sources.
Fluorescent tube-lights and compact fluorescent lamps (CFLs) are better electricity ______ lighting sources.
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LED bulbs consume less electricity as compared to incandescent bulbs or fluorescent tubes or ______.
LED bulbs consume less electricity as compared to incandescent bulbs or fluorescent tubes or ______.
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It is advised to use electrical appliances and gadgets, which are electricity ______.
It is advised to use electrical appliances and gadgets, which are electricity ______.
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Bureau of Indian Standards assigns a Standard Mark on products, called ______ mark.
Bureau of Indian Standards assigns a Standard Mark on products, called ______ mark.
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Fluorescent tubes and CFLs contain ______ vapour, toxic in nature.
Fluorescent tubes and CFLs contain ______ vapour, toxic in nature.
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Fuses are inserted in all electrical ______.
Fuses are inserted in all electrical ______.
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If a large current passes through a wire, the wire may become so hot that it may even ______ and break.
If a large current passes through a wire, the wire may become so hot that it may even ______ and break.
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Longer line in the symbol for a cell represents its ______ terminal.
Longer line in the symbol for a cell represents its ______ terminal.
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When current is switched ‘on’ in a room heater, it ______.
When current is switched ‘on’ in a room heater, it ______.
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The safety device based on the heating effect of electric current is called a ______.
The safety device based on the heating effect of electric current is called a ______.
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An electric bell has an ______.
An electric bell has an ______.
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To make a battery of two cells, the negative terminal of one cell is connected to the ______ terminal of the other cell.
To make a battery of two cells, the negative terminal of one cell is connected to the ______ terminal of the other cell.
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When the electric current through the fuse exceeds a certain limit, the fuse wire ______ and breaks.
When the electric current through the fuse exceeds a certain limit, the fuse wire ______ and breaks.
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An electromagnet does not ______ a piece of iron.
An electromagnet does not ______ a piece of iron.
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Boojho struggled to lift the box after the magician made a show of moving his ______.
Boojho struggled to lift the box after the magician made a show of moving his ______.
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The electromagnets were made with 20, 40, 60, and ______ turns.
The electromagnets were made with 20, 40, 60, and ______ turns.
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Thomas Alva Edison is credited with the invention of the electric ______.
Thomas Alva Edison is credited with the invention of the electric ______.
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To make a working model of a railway signal, one of the components used is an iron ______.
To make a working model of a railway signal, one of the components used is an iron ______.
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An electrician can explain how various types of fuses and ______ work.
An electrician can explain how various types of fuses and ______ work.
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Edison made around ______ inventions during his lifetime.
Edison made around ______ inventions during his lifetime.
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The audience, including Paheli and Boojho, were impressed, believing the magician had ______ powers.
The audience, including Paheli and Boojho, were impressed, believing the magician had ______ powers.
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Electromagnets can attract a certain number of pins, which helps in comparing their ______.
Electromagnets can attract a certain number of pins, which helps in comparing their ______.
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Study Notes
Electric Current and its Effects
- Electric components have symbols for easier representation
- Electric cells have a longer line for the positive terminal and a shorter, thicker line for the negative terminal
- Switches are represented by different symbols for 'on' and 'off' positions
- Wires connecting components are shown as lines
- Batteries are used to combine multiple cells
- The positive terminal of one cell is connected to the negative terminal of the next, arranging them in a series
- The combination of two or more cells is a battery
- It is suggested to draw circuit diagrams using symbols
- Some common circuit components include: electric cell, electric bulb, switch (on position), switch (off position), and battery
- Batteries use multiple cells connected together
- The circuit must be closed for a light bulb to glow
- The filament in the bulb is a thin wire which glows when a current passes through it to produce light
- The heating effect of electric current is used in many appliances, such as room heaters, electric irons, and immersion heaters
- The heating effect occurs in materials when a large current passes through them
- Materials used to make electric wires vary based on the required amount of heat
- Fuses are devices that break the circuit when a large current flows to protect electrical circuits from damage
- Miniature Circuit Breakers (MCBs) are used instead of fuses in modern applications
- An electromagnet is a current-carrying coil of an insulated wire wrapped around a piece of iron to produce a stronger magnetic effect
- Electromagnets are used in many devices including doorbells, toys, and cranes
- Proper safety procedures are crucial when working with electric circuits and appliances to reduce risk of electric shock and burnt areas.
- Some applications of electric current include lighting, heating, and creating magnetic fields
- A current carrying coil around an iron piece creates a stronger magnetic field, called an electromagnet
Symbols of Electric Components
- Illustrations and descriptions of symbols for different electrical components are provided in a table
Magnetic Effect of Electric Current
- Electrical currents create magnetic fields (magnetic effect of current)
- When electricity flows through a wire, a nearby compass needle will move, indicating a magnetic field
- This demonstrates that the wire behaves like a magnet
- Electromagnets are used in many devices to create a strong, temporary magnetic field
Heating Effect of Electric Current
- Currents produce heat
- The amount of heat and the material's design influence the heat produced
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Description
This quiz covers key concepts related to electric current and its effects, including the symbols used for electric components, the arrangement of cells in batteries, and the heating effect of electric current. Test your understanding of circuit diagrams, components, and the essential role of a closed circuit in lighting a bulb. Ideal for students studying basic electricity principles.
