Electric Current and its Effects
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Questions and Answers

Boojho wondered if there was an easier way to represent these electric ______.

components

Many devices, such as torches and toys, use ______.

batteries

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.

<p>symbols</p> Signup and view all the answers

We can connect two or more ______ together as shown in figures.

<p>cells</p> Signup and view all the answers

Sometimes the cells are placed ______ by side in a battery compartment.

<p>side</p> Signup and view all the answers

A cell holder can be made using a wooden block, iron strips, and ______.

<p>rubber bands</p> Signup and view all the answers

The switch can be in ‘ON’ or ‘______’ position.

<p>OFF</p> Signup and view all the answers

A combination of two or more cells is called a ______.

<p>battery</p> Signup and view all the answers

In a battery, the positive terminal of one cell is connected to the ______ terminal of the next cell.

<p>negative</p> Signup and view all the answers

To make a battery, you can use a cell holder with metal clips and ______ to connect the cells.

<p>wire</p> Signup and view all the answers

The symbol used for representing a battery is shown in ______.

<p>Table 10.1</p> Signup and view all the answers

The ______ glows only when the switch is in the ‘ON’ position.

<p>bulb</p> Signup and view all the answers

You can buy ______ from the market for making batteries of two or more electric cells.

<p>cell holders</p> Signup and view all the answers

Place the cells in the holder properly, ensuring the positive and negative terminals are ______.

<p>aligned</p> Signup and view all the answers

You used a similar circuit in Class VI to make an electric ______ glow.

<p>bulb</p> Signup and view all the answers

Batteries used in tractors, trucks, and inverters are made from ______.

<p>cells</p> Signup and view all the answers

An electric circuit can be represented by its circuit ______.

<p>diagram</p> Signup and view all the answers

The bulb glows only when the switch is in the '______' position.

<p>ON</p> Signup and view all the answers

When the bulb gets fused, its ______ is broken.

<p>filament</p> Signup and view all the answers

Never touch a lighted electric bulb connected to the ______.

<p>mains</p> Signup and view all the answers

Experimenting with electric supply from the mains may result in an electric ______.

<p>shock</p> Signup and view all the answers

It is easier to draw a circuit using ______.

<p>symbols</p> Signup and view all the answers

The diagram shown in Fig. 10.8 is compared with the diagram shown in Fig. ______.

<p>10.9</p> Signup and view all the answers

Incandescent electric bulbs are often used for ______ but they also give heat.

<p>lighting</p> Signup and view all the answers

Fluorescent tube-lights and compact fluorescent lamps (CFLs) are better electricity ______ lighting sources.

<p>efficient</p> Signup and view all the answers

LED bulbs consume less electricity as compared to incandescent bulbs or fluorescent tubes or ______.

<p>CFLs</p> Signup and view all the answers

It is advised to use electrical appliances and gadgets, which are electricity ______.

<p>efficient</p> Signup and view all the answers

Bureau of Indian Standards assigns a Standard Mark on products, called ______ mark.

<p>ISI</p> Signup and view all the answers

Fluorescent tubes and CFLs contain ______ vapour, toxic in nature.

<p>mercury</p> Signup and view all the answers

Fuses are inserted in all electrical ______.

<p>circuits</p> Signup and view all the answers

If a large current passes through a wire, the wire may become so hot that it may even ______ and break.

<p>melt</p> Signup and view all the answers

Longer line in the symbol for a cell represents its ______ terminal.

<p>positive</p> Signup and view all the answers

When current is switched ‘on’ in a room heater, it ______.

<p>heats up</p> Signup and view all the answers

The safety device based on the heating effect of electric current is called a ______.

<p>fuse</p> Signup and view all the answers

An electric bell has an ______.

<p>electromagnet</p> Signup and view all the answers

To make a battery of two cells, the negative terminal of one cell is connected to the ______ terminal of the other cell.

<p>positive</p> Signup and view all the answers

When the electric current through the fuse exceeds a certain limit, the fuse wire ______ and breaks.

<p>melts</p> Signup and view all the answers

An electromagnet does not ______ a piece of iron.

<p>attract</p> Signup and view all the answers

Boojho struggled to lift the box after the magician made a show of moving his ______.

<p>stick</p> Signup and view all the answers

The electromagnets were made with 20, 40, 60, and ______ turns.

<p>80</p> Signup and view all the answers

Thomas Alva Edison is credited with the invention of the electric ______.

<p>bulb</p> Signup and view all the answers

To make a working model of a railway signal, one of the components used is an iron ______.

<p>nail</p> Signup and view all the answers

An electrician can explain how various types of fuses and ______ work.

<p>MCB</p> Signup and view all the answers

Edison made around ______ inventions during his lifetime.

<p>1300</p> Signup and view all the answers

The audience, including Paheli and Boojho, were impressed, believing the magician had ______ powers.

<p>supernatural</p> Signup and view all the answers

Electromagnets can attract a certain number of pins, which helps in comparing their ______.

<p>strengths</p> Signup and view all the answers

Flashcards

Battery

A combination of two or more electric cells connected together, with the positive terminal of one cell connected to the negative terminal of the next.

Cell

A single unit that can produce electricity through a chemical reaction.

Terminal

A point on a cell or battery where electricity enters or exits.

Positive Terminal

The terminal where electricity exits the cell or battery.

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Negative Terminal

The terminal where electricity enters the cell or battery.

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Circuit Diagram

A simplified drawing that uses symbols to represent the components of an electric circuit.

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Switch

A device that controls the flow of electricity in a circuit, turning it 'ON' or 'OFF'.

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Wire

A conductor that carries electricity from one point to another in a circuit.

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Electric Circuit Components

Parts of a circuit that allow electricity to flow, such as batteries, bulbs, and switches.

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Symbol for Electric Cell

A simple drawing that represents a battery in a circuit diagram, typically a long line with a shorter line on top.

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Symbol for Electric Bulb

A symbol used in circuit diagrams to represent a light bulb, typically a circle with a small loop inside.

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Switch in 'ON' Position

A symbol representing a switch that allows electricity to flow through the circuit, typically drawn as a broken line with a gap.

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Switch in 'OFF' Position

A symbol representing a switch that blocks the flow of electricity in a circuit, typically drawn as a solid line.

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Connecting Cells to Make Batteries

Connecting multiple electric cells together to increase the voltage and provide more power, typically by linking the positive terminal of one cell to the negative terminal of the next.

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Battery Compartment

A sealed enclosure in a device where electric cells are placed to provide power, often with markings to help users correctly position the cells.

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Cell Holder

A simple device used to organize and connect electric cells, often made from wood, with metal strips and rubber bands to hold the cells in place.

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Electric Circuit

A complete path that allows electric current to flow from a power source, through a load (like a bulb), and back to the source.

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Closed Circuit

A complete path that allows electric current to flow continuously, enabling devices to work.

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Open Circuit

An incomplete path that prevents electric current from flowing, causing devices to stop working.

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Fused Bulb

A bulb that has stopped working because its filament, the thin wire inside, has broken.

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Electric Shock

The painful or dangerous effect of electric current passing through the human body.

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Safety with Electricity

Never touching live electrical wires or equipment as it can cause serious injury.

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Incandescent Bulb

An electric bulb that produces light by heating a filament until it glows. It also emits heat, making it less efficient than other options.

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Fluorescent Tube

A type of light bulb that uses electricity to excite mercury vapor, producing ultraviolet light that then causes a phosphor coating to emit visible light.

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CFL (Compact Fluorescent Lamp)

A more energy efficient light bulb that operates similar to fluorescent tubes, but in a smaller, compact design.

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LED (Light Emitting Diode)

A light bulb that uses semi-conductor materials to generate light efficiently and produce very little heat.

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Electricity Efficiency

The ability of an appliance to use electricity effectively, minimizing energy waste.

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ISI Mark

A symbol indicating that a product meets Indian standards, conforming to safety and quality requirements.

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Current Limit

The maximum amount of current that an electrical circuit can safely handle without risking damage or overheating.

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Electromagnet

A temporary magnet created by wrapping a wire coil around a core of iron. The strength of the magnet depends on the amount of current flowing through the coil.

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Electromagnet Use

Electromagnets are used in various applications like electric bells, motors, cranes, and even for separating magnetic materials from a mixture.

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Cell (in circuit)

A single unit that converts chemical energy into electrical energy.

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Circuit Defects

There could be several reasons for a bulb not lighting up in a circuit: a broken wire, a loose connection, a faulty bulb, or a dead battery.

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Safety Device

A device designed to protect people and equipment from electrical hazards. Examples include fuses, circuit breakers, and grounding.

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Replacing Fuse with Wire

Replacing a fuse with a wire is extremely dangerous and should never be done. The wire cannot melt and break like a fuse, leading to overheating and potential fires.

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Strength of an electromagnet

The strength of an electromagnet depends on the number of turns of wire in the coil and the amount of electric current flowing through it.

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Railway Signal

A device used to control the movement of trains by displaying signals that indicate whether a track is clear or blocked.

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MCB

Miniature Circuit Breaker, a resettable safety device that automatically breaks a circuit when current exceeds a safe limit.

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Thomas Alva Edison

Famous inventor credited with inventing the light bulb, gramophone, motion picture camera, and carbon transmitter.

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How does a magic trick with a heavy box work?

The magician likely uses an electromagnet to temporarily make the box heavier. The magnet is turned on and off to control the weight of the box.

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What is the relationship between electricity and magnetism?

Electricity and magnetism are interconnected forces. An electric current creates a magnetic field, and a changing magnetic field can induce an electric current.

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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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Related Documents

Electric Current and its Effects PDF

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.

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