Electric Circuits and Battery Function

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Questions and Answers

What connects the positive terminal of one cell to the negative terminal of the next cell in a battery?

A metal strip

A wire (correct)

A circuit board

A rubber band

How can you make an electric circuit functional?

By positioning a switch in the 'OFF' position

By connecting wires to the correct terminals of the battery (correct)

By connecting a bulb without a switch

By using more than one switch

What happens to the bulb in the circuit when the switch is flipped to the 'ON' position?

The bulb gets very hot immediately

The bulb remains off

The bulb glows (correct)

The bulb flickers

What is the correct function of a cell holder in a battery setup?

To securely hold cells and provide connections Signup and view all the answers

Which item is NOT needed to complete the circuit as described?

A circuit board Signup and view all the answers

What symbol is used to represent a battery in a circuit diagram?

A pair of parallel lines Signup and view all the answers

What is the primary purpose of connecting the cells in series within a battery?

To increase the voltage output Signup and view all the answers

What might happen if the cells in the cell holder are not positioned properly?

The circuit will not function correctly Signup and view all the answers

What happens to the circuit when the switch is in the 'ON' position?

The circuit is complete. Signup and view all the answers

Which part of the bulb glows when current flows through it?

The filament. Signup and view all the answers

What happens to the elements inside electric appliances when they are switched on?

They become red hot and produce heat. Signup and view all the answers

What effect does the electric current have on the filament of the bulb?

It causes the filament to glow brightly. Signup and view all the answers

Which material property mainly affects the heat produced in a wire?

Length and thickness of the wire Signup and view all the answers

Which of the following describes an open circuit?

The switch is in the 'OFF' position. Signup and view all the answers

What should you avoid doing with the switch of an electric appliance?

Switching it on for an extended period. Signup and view all the answers

What is the heating effect of electric current primarily responsible for?

Heating appliances. Signup and view all the answers

What is the coil of wire in an electric appliance called?

Element Signup and view all the answers

What should be done before turning the switch to the 'ON' position to observe the heating effect?

Keep the switch in the 'OFF' position. Signup and view all the answers

Why is it important to switch off the current after touching the wire?

To avoid electric shock. Signup and view all the answers

What happens to the bulb if its filament is broken?

The circuit remains open. Signup and view all the answers

Which of the following appliances likely contains an element?

A toaster Signup and view all the answers

Where can nichrome wire typically be obtained from?

An electric repair shop. Signup and view all the answers

What is the general effect of using wires of different materials for electric circuits?

They impact the current flowing through the circuit. Signup and view all the answers

Which of the following is NOT a characteristic of the wires used for electric circuits?

They are all of the same thickness. Signup and view all the answers

What is one reason incandescent bulbs are considered less efficient compared to LED bulbs?

Incandescent bulbs produce significant heat. Signup and view all the answers

Which of the following statements is true regarding fluorescent tubes and CFLs?

They contain mercury vapour, which is toxic. Signup and view all the answers

What role does the Bureau of Indian Standards play in relation to electrical products?

It issues ISI marks for safety and efficiency. Signup and view all the answers

Which statement best describes the behavior of a fuse in an electrical circuit?

Fuses melt when current exceeds safe limits. Signup and view all the answers

Why is it recommended to use electrical appliances that are electricity efficient?

They help in reducing electricity wastage. Signup and view all the answers

What is one reason for the increasing preference for LED bulbs?

They consume less electricity for the same light output. Signup and view all the answers

What could happen if a wire in an electrical appliance overheats?

The wire may melt and break. Signup and view all the answers

Which of the following is NOT a characteristic of LED bulbs?

They generate heat comparable to incandescent bulbs. Signup and view all the answers

What is the purpose of using proper fuses in electrical applications?

To prevent damage to electrical circuits and possible fires Signup and view all the answers

What observation can be made when a bar magnet is brought near the compass needle?

The compass needle deflects from its position Signup and view all the answers

When the electric current is turned on, what happens to the compass needle?

It becomes magnetized and points in a different direction Signup and view all the answers

Why should the current not be switched on for a long period during the experiment?

The electromagnet weakens quickly if left connected Signup and view all the answers

What is a crucial safety measure mentioned when conducting the experiments?

Always use wires that have an ISI mark Signup and view all the answers

When moving the switch to the ‘ON’ position, what electrical effect is primarily observed?

Magnetic effect of the electric current Signup and view all the answers

What material is suggested for wrapping the wire in the experiments?

Plastic or cloth-covered insulation Signup and view all the answers

How does the presence of the magnetic field affect the compass needle during the experiment?

It makes the needle deflect from its original orientation Signup and view all the answers

What does the longer line in the symbol for a cell represent?

Positive terminal Signup and view all the answers

What is the combination of two or more cells called?

Battery Signup and view all the answers

What happens when the current is switched 'on' in a room heater?

It produces heat Signup and view all the answers

When the electric current through the fuse exceeds a certain limit, what occurs?

The fuse wire melts and breaks Signup and view all the answers

Which statement about an electromagnet is true?

It only works with iron Signup and view all the answers

Why would it be unsafe for an electrician to replace a fuse with a piece of wire?

It poses a fire risk due to overheating Signup and view all the answers

What might be a possible defect if the bulb does not glow when the switch is 'ON'?

There is a break in the circuit Signup and view all the answers

What happens to an unshielded compass when an electric current flows through a nearby conductor?

It will show deflection due to the magnetic field created by the current Signup and view all the answers

Study Notes

Electric Current and its Effects

Electric components have symbols for easier representation in diagrams, as shown in Table 10.1
An electric cell symbol shows a longer line for the positive terminal and a thicker, shorter line for the negative terminal.
A switch in the 'ON' position is represented by a line with a crossbar, and the 'OFF' position by a simple straight line.
Wires are represented by lines.
A battery is a combination of two or more cells connected with the positive terminal of one cell connected to the negative terminal of the next.
Diagrams of electric circuits can be made using standard symbols.
Electric circuits connected to a battery cause the bulb to glow when the switch is in the 'ON' position.
Electric circuits with various components, like switches and filaments, are represented using symbols to show how components are connected.

Heating Effect of Electric Current

When electricity flows through a wire, the wire gets hot, known as the heating effect.
Many electrical appliances utilize the heating effect, such as an electric heater, room heater or cooking appliances.

Electric Fuse

In electrical circuits, fuses act as safety devices.
They melt when a large current flows through the circuit, preventing overheating and potential fire hazards.
Miniature circuit breakers (MCBs) are increasingly used in place of fuses.

Magnetic Effect of Electric Current

A wire carrying electric current behaves like a magnet.
This magnetic effect can be demonstrated using a compass needle and a wire.
Electromagnets, coils of wire wrapped around an iron core, intensify the magnetic effect.
Electromagnets are used in various devices, like electric bells and cranes.

Electric Bell

An electric bell uses an electromagnet to operate a hammer which strikes a gong, producing a sound.
The electromagnet only works when current flows through it.
The swinging of the hammer breaks the circuit, causing the electromagnet to stop working allowing the hammer to return to its resting position and the circuit to be completed again.

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Description

Test your knowledge about electric circuits and battery setups with this quiz. Explore various concepts such as the connection of cells, the role of switches, and the behavior of bulbs in circuits. Understand key terms and the functionality of circuit components.