The earth wire functions as a safety measure, specially for those appliances that have a metallic body e.g., electric press, toaster, table fan, refrigerator, room cooler etc. The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electRead more
The earth wire functions as a safety measure, specially for those appliances that have a metallic body e.g., electric press, toaster, table fan, refrigerator, room cooler etc. The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electric current. It ensures that any leakage of current to the metallic body of an appliance keeps its potential same as of earth. As a result, the user would not get a severe electric shock, even if he touches the body of appliance.
We should take following precautions to avoid the overloading of domestic electric circuits : (i) Two separate circuits should be used, one of 5 A current ratings such as geysers, air coolers, electric iron, electric stove etc. (ii) Too many appliances should never be connected to a single socket. (Read more
We should take following precautions to avoid the overloading of domestic electric circuits :
(i) Two separate circuits should be used, one of 5 A current ratings such as geysers, air coolers, electric iron, electric stove etc.
(ii) Too many appliances should never be connected to a single socket.
(iii) A fuse of appropriate current rating should be used with the electric circuit.
An electric generator is based on the principle of electromagnetic induction. when a coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.
An electric generator is based on the principle of electromagnetic induction. when a coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.
Different ways to induce current in a coil are as given below : (i) If a magnetic field is changed around a coil, an induced current is set up in the coil. (ii) If a coil is moved in a magnetic field, an induced current is set up in the coil. (iii) If a coil is rotated in a uniform magnetic field, iRead more
Different ways to induce current in a coil are as given below :
(i) If a magnetic field is changed around a coil, an induced current is set up in the coil.
(ii) If a coil is moved in a magnetic field, an induced current is set up in the coil.
(iii) If a coil is rotated in a uniform magnetic field, it produces an induced current in the coil.
In an electric motor, the split ring acts as a commutator. Due to its action, the direction of current flowing in motor coil reverses after every half turn, giving rise to a continuous rotation of the coil and the axle.
In an electric motor, the split ring acts as a commutator. Due to its action, the direction of current flowing in motor coil reverses after every half turn, giving rise to a continuous rotation of the coil and the axle.
An electric motor is based on the principle that a current- carrying conductor experiences a force when placed in a magnetic field. If the direction of the magnetic field and that of the current are mutually perpendicular then the direction of the force is given by fleming's left-hand rule.
An electric motor is based on the principle that a current- carrying conductor experiences a force when placed in a magnetic field. If the direction of the magnetic field and that of the current are mutually perpendicular then the direction of the force is given by fleming’s left-hand rule.
The compass needle is a small bar magnet. When a compass needle is brought near a bar magnet than due to repulsive force between like poles and attraction between unlike poles, the compass needle is deflected. Finally, the compass needle comes to rest in the direction of net magnetic field.
The compass needle is a small bar magnet. When a compass needle is brought near a bar magnet than due to repulsive force between like poles and attraction between unlike poles, the compass needle is deflected. Finally, the compass needle comes to rest in the direction of net magnetic field.
Who was Captain Swing? What did the name symbolise or represent?
It was a mythic name used in the letters of warnings to the farmers using threshing machines.
It was a mythic name used in the letters of warnings to the farmers using
See lessthreshing machines.
What is the function of an earth wire? Why is it necessary to earth metallic appliances?
The earth wire functions as a safety measure, specially for those appliances that have a metallic body e.g., electric press, toaster, table fan, refrigerator, room cooler etc. The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electRead more
The earth wire functions as a safety measure, specially for those appliances that have a metallic body e.g., electric press, toaster, table fan, refrigerator, room cooler etc. The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electric current. It ensures that any leakage of current to the metallic body of an appliance keeps its potential same as of earth. As a result, the user would not get a severe electric shock, even if he touches the body of appliance.
See lessWhat precaution should be taken to avoid the overloading of domestic electric circuits?
We should take following precautions to avoid the overloading of domestic electric circuits : (i) Two separate circuits should be used, one of 5 A current ratings such as geysers, air coolers, electric iron, electric stove etc. (ii) Too many appliances should never be connected to a single socket. (Read more
We should take following precautions to avoid the overloading of domestic electric circuits :
See less(i) Two separate circuits should be used, one of 5 A current ratings such as geysers, air coolers, electric iron, electric stove etc.
(ii) Too many appliances should never be connected to a single socket.
(iii) A fuse of appropriate current rating should be used with the electric circuit.
Name some sources of direct current.
Some sources of direct current are a cell a battery and a D.C. generator.
Some sources of direct current are a cell a battery and a D.C. generator.
See lessState the principle of an electric generator.
An electric generator is based on the principle of electromagnetic induction. when a coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.
An electric generator is based on the principle of electromagnetic induction. when a coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.
See lessExplain different ways to induce current in a coil.
Different ways to induce current in a coil are as given below : (i) If a magnetic field is changed around a coil, an induced current is set up in the coil. (ii) If a coil is moved in a magnetic field, an induced current is set up in the coil. (iii) If a coil is rotated in a uniform magnetic field, iRead more
Different ways to induce current in a coil are as given below :
See less(i) If a magnetic field is changed around a coil, an induced current is set up in the coil.
(ii) If a coil is moved in a magnetic field, an induced current is set up in the coil.
(iii) If a coil is rotated in a uniform magnetic field, it produces an induced current in the coil.
What is the role of the split ring in an electric motor?
In an electric motor, the split ring acts as a commutator. Due to its action, the direction of current flowing in motor coil reverses after every half turn, giving rise to a continuous rotation of the coil and the axle.
In an electric motor, the split ring acts as a commutator. Due to its action, the direction of current flowing in motor coil reverses after every half turn, giving rise to a continuous rotation of the coil and the axle.
See lessWhat is the principle of an electric motor?
An electric motor is based on the principle that a current- carrying conductor experiences a force when placed in a magnetic field. If the direction of the magnetic field and that of the current are mutually perpendicular then the direction of the force is given by fleming's left-hand rule.
An electric motor is based on the principle that a current- carrying conductor experiences a force when placed in a magnetic field. If the direction of the magnetic field and that of the current are mutually perpendicular then the direction of the force is given by fleming’s left-hand rule.
See lessWhy does a compass needle get deflected when brought near a bar magnet?
The compass needle is a small bar magnet. When a compass needle is brought near a bar magnet than due to repulsive force between like poles and attraction between unlike poles, the compass needle is deflected. Finally, the compass needle comes to rest in the direction of net magnetic field.
The compass needle is a small bar magnet. When a compass needle is brought near a bar magnet than due to repulsive force between like poles and attraction between unlike poles, the compass needle is deflected. Finally, the compass needle comes to rest in the direction of net magnetic field.
See less