Possible reasons are as follows: • The bulb may be fused or defective. • Cells are not connected properly. • There may be loose connections. • The switch is not functioning well. • The cells are dried up i.e. the power of the cell has been exhausted. https://www.tiwariacademy.com/ncert-solutions/claRead more
Possible reasons are as follows:
• The bulb may be fused or defective.
• Cells are not connected properly.
• There may be loose connections.
• The switch is not functioning well.
• The cells are dried up i.e. the power of the cell has been exhausted.
Fuse is a device that is a safeguard to all of our electrical appliances. They are made up of special material which melt quickly and break when a large electric currents passed through it. If the electrician does not use proper fuse wire, instead he uses any ordinary electric wire as fuse, it increRead more
Fuse is a device that is a safeguard to all of our electrical appliances. They are made up of special material which melt quickly and break when a large electric currents passed through it.
If the electrician does not use proper fuse wire, instead he uses any ordinary electric wire as fuse, it increases the risk of overheating of wires due to flow of excessive current. It may lead to short circuit in electric equipment and these appliances may catch fire. It is advised to use standard fuse wire or MCBs to prevent electrical accidents.
An electromagnet is just like as a bar magnet and it can attract iron pieces only. Plastic does not have any magnetic property, so electromagnet cannot be used to separate plastic bags from garbage heap. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
An electromagnet is just like as a bar magnet and it can attract iron pieces only. Plastic does not have any magnetic property, so electromagnet cannot be used to separate plastic bags from garbage heap.
The safety device based on the heating effect of electric current is called a fuse. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
The safety device based on the heating effect of electric current is called a fuse.
The current carrying wire produces magnetic field around it. When a compass is kept nearby this wire, the two magnetic field (magnetic field due to wire and magnetic field due to compass) interact each other causing deflection in magnetic needle. When the current is switched off, there is no magnetiRead more
The current carrying wire produces magnetic field around it. When a compass is kept nearby this wire, the two magnetic field (magnetic field due to wire and magnetic field due to compass) interact each other causing deflection in magnetic needle. When the current is switched off, there is no magnetic field produced by the wire, magnetic needle does not deflect from its north-south position.
Heating Effect of current: When an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current. Which is used in many heating applications like electric heater, electric ion, light bulb etc. Magnetic Effect of current: When an electric current flows tRead more
Heating Effect of current: When an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current. Which is used in many heating applications like electric heater, electric ion, light bulb etc.
Magnetic Effect of current: When an electric current flows through a wire, it generates magnetic field around it. This effect is called magnetic effect of current. Magnetic Effect of electric current has many applications like power lift, electric bell, electric fan etc.
Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
Possible reasons are as follows: • The bulb may be fused or defective. • Cells are not connected properly. • There may be loose connections. • The switch is not functioning well. • The cells are dried up i.e. the power of the cell has been exhausted. https://www.tiwariacademy.com/ncert-solutions/claRead more
Possible reasons are as follows:
• The bulb may be fused or defective.
• Cells are not connected properly.
• There may be loose connections.
• The switch is not functioning well.
• The cells are dried up i.e. the power of the cell has been exhausted.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessAn electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.
Fuse is a device that is a safeguard to all of our electrical appliances. They are made up of special material which melt quickly and break when a large electric currents passed through it. If the electrician does not use proper fuse wire, instead he uses any ordinary electric wire as fuse, it increRead more
Fuse is a device that is a safeguard to all of our electrical appliances. They are made up of special material which melt quickly and break when a large electric currents passed through it.
If the electrician does not use proper fuse wire, instead he uses any ordinary electric wire as fuse, it increases the risk of overheating of wires due to flow of excessive current. It may lead to short circuit in electric equipment and these appliances may catch fire. It is advised to use standard fuse wire or MCBs to prevent electrical accidents.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessDo you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
An electromagnet is just like as a bar magnet and it can attract iron pieces only. Plastic does not have any magnetic property, so electromagnet cannot be used to separate plastic bags from garbage heap. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
An electromagnet is just like as a bar magnet and it can attract iron pieces only. Plastic does not have any magnetic property, so electromagnet cannot be used to separate plastic bags from garbage heap.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessFill in the blanks: 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 fuse. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
The safety device based on the heating effect of electric current is called a fuse.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessFill in the blanks: When current is switched ‘on’ in a room heater, it ____________.
When current is switched ‘on’ in a room heater, it becomes hot. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
When current is switched ‘on’ in a room heater, it becomes hot.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessFill in the blanks: The combination of two or more cells is called a ____________.
The combination of two or more cells is called a battery. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
The combination of two or more cells is called a battery.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessFill in the blanks: Longer line in the symbol for a cell represents its ____________ terminal.
Longer line in the symbol for a cell represents its positive terminal. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
Longer line in the symbol for a cell represents its positive terminal.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessWhen the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
The current carrying wire produces magnetic field around it. When a compass is kept nearby this wire, the two magnetic field (magnetic field due to wire and magnetic field due to compass) interact each other causing deflection in magnetic needle. When the current is switched off, there is no magnetiRead more
The current carrying wire produces magnetic field around it. When a compass is kept nearby this wire, the two magnetic field (magnetic field due to wire and magnetic field due to compass) interact each other causing deflection in magnetic needle. When the current is switched off, there is no magnetic field produced by the wire, magnetic needle does not deflect from its north-south position.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessName any two effects of electric current.
Heating Effect of current: When an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current. Which is used in many heating applications like electric heater, electric ion, light bulb etc. Magnetic Effect of current: When an electric current flows tRead more
Heating Effect of current: When an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current. Which is used in many heating applications like electric heater, electric ion, light bulb etc.
Magnetic Effect of current: When an electric current flows through a wire, it generates magnetic field around it. This effect is called magnetic effect of current. Magnetic Effect of electric current has many applications like power lift, electric bell, electric fan etc.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-14/
See lessWhat would be the CBSE Exam 2022-2023 Date Sheet for Class 10 and 12?
May 2021
May 2021
See less