When two circular coils A and B are placed close to each other and the current in coil A is changed, it leads to induction of current in coil B. This happens because of change in magnetic field of coil A; because of change in current in this coil.
When two circular coils A and B are placed close to each other and the current in coil A is changed, it leads to induction of current in coil B. This happens because of change in magnetic field of coil A; because of change in current in this coil.
The structure of electric generator is similar to that of an electric motor. In case of an electric generator a rectangular armature is placed within the magnetic field of a permanent magnet. The armature is attached to wire and is positioned in way that it can move around an axle. When the armatureRead more
The structure of electric generator is similar to that of an electric motor. In case of an electric generator a rectangular armature is placed within the magnetic field of a permanent magnet. The armature is attached to wire and is positioned in way that it can move around an axle. When the armature moves within the magnetic field an electric current is induced.The direction of induced current changes, when the armature crosses the halfway mark of its rotation. Thus, the direction of current changes once in every rotation. Due to this, the electric generator usually produces alternate current, i.e. AC.To convert an AC generator into a DC generator, a split ring commutator is used. This helps in producing direct current.
When positive and negative wires touch each other, the resistance suddenly decreases and current increases. This leads to excessive heating of wire which manifests in the form of sparks. This is called short circuit.
When positive and negative wires touch each other, the resistance suddenly decreases and current increases. This leads to excessive heating of wire which manifests in the form of sparks. This is called short circuit.
The earth wire transfers any leakage of electric current to the earth. The leaked current can otherwise reach the metallic body of an appliance and can lead to electric shock. Earth wire prevents from electric shock by safety transferring the leaked current to the earth.
The earth wire transfers any leakage of electric current to the earth. The leaked current can otherwise reach the metallic body of an appliance and can lead to electric shock. Earth wire prevents from electric shock by safety transferring the leaked current to the earth.
Precautions to avoid overloading of domestic electric circuit: (a) Avoid using too many appliances in a single line, i.e. from a single output. (b) Appliances should always be checked for potential faults and should be repaired in time. (c) Fuse or MCB of proper rating should be used.
Precautions to avoid overloading of domestic electric circuit:
(a) Avoid using too many appliances in a single line, i.e. from a single output.
(b) Appliances should always be checked for potential faults and should be repaired in time.
(c) Fuse or MCB of proper rating should be used.
The current drawn by the electric oven can be calculated using following formula: P=VI Or , I=P/V We have; P = 2kW = 2000 W and V = 220 V So, I=2000w/220V=9.09A Here, the oven is drawing 9.09 ampere of current from a 5 ampere source. This means there would be an overload on the circuit. This can resRead more
The current drawn by the electric oven can be calculated using following formula:
P=VI Or , I=P/V
We have; P = 2kW = 2000 W and V = 220 V
So, I=2000w/220V=9.09A
Here, the oven is drawing 9.09 ampere of current from a 5 ampere source.
This means there would be an overload on the circuit. This can result in accidental fire in the circuit.
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
When two circular coils A and B are placed close to each other and the current in coil A is changed, it leads to induction of current in coil B. This happens because of change in magnetic field of coil A; because of change in current in this coil.
When two circular coils A and B are placed close to each other and the current in coil A is changed, it leads to induction of current in coil B. This happens because of change in magnetic field of coil A; because of change in current in this coil.
See lessState the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.
(a) Right hand thumb rule or Maxwell’s corkscrew rule, (b) Fleming’s Left Hand Rule and (c) Fleming’s Right Hand Rule
(a) Right hand thumb rule or Maxwell’s corkscrew rule,
See less(b) Fleming’s Left Hand Rule and
(c) Fleming’s Right Hand Rule
Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?
The structure of electric generator is similar to that of an electric motor. In case of an electric generator a rectangular armature is placed within the magnetic field of a permanent magnet. The armature is attached to wire and is positioned in way that it can move around an axle. When the armatureRead more
The structure of electric generator is similar to that of an electric motor. In case of an electric generator a rectangular armature is placed within the magnetic field of a permanent magnet. The armature is attached to wire and is positioned in way that it can move around an axle. When the armature moves within the magnetic field an electric current is induced.The direction of induced current changes, when the armature crosses the halfway mark of its rotation. Thus, the direction of current changes once in every rotation. Due to this, the electric generator usually produces alternate current, i.e. AC.To convert an AC generator into a DC generator, a split ring commutator is used. This helps in producing direct current.
See lessWhen does an electric short circuit occur?
When positive and negative wires touch each other, the resistance suddenly decreases and current increases. This leads to excessive heating of wire which manifests in the form of sparks. This is called short circuit.
When positive and negative wires touch each other, the resistance suddenly decreases and current increases. This leads to excessive heating of wire which manifests in the form of sparks. This is called short circuit.
See lessWhat is the function of an earth wire? Why is it necessary to earth metallic appliances?
The earth wire transfers any leakage of electric current to the earth. The leaked current can otherwise reach the metallic body of an appliance and can lead to electric shock. Earth wire prevents from electric shock by safety transferring the leaked current to the earth.
The earth wire transfers any leakage of electric current to the earth. The leaked current can otherwise reach the metallic body of an appliance and can lead to electric shock. Earth wire prevents from electric shock by safety transferring the leaked current to the earth.
See lessWhat precaution should be taken to avoid the overloading of domestic electric circuits?
Precautions to avoid overloading of domestic electric circuit: (a) Avoid using too many appliances in a single line, i.e. from a single output. (b) Appliances should always be checked for potential faults and should be repaired in time. (c) Fuse or MCB of proper rating should be used.
Precautions to avoid overloading of domestic electric circuit:
See less(a) Avoid using too many appliances in a single line, i.e. from a single output.
(b) Appliances should always be checked for potential faults and should be repaired in time.
(c) Fuse or MCB of proper rating should be used.
An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
The current drawn by the electric oven can be calculated using following formula: P=VI Or , I=P/V We have; P = 2kW = 2000 W and V = 220 V So, I=2000w/220V=9.09A Here, the oven is drawing 9.09 ampere of current from a 5 ampere source. This means there would be an overload on the circuit. This can resRead more
The current drawn by the electric oven can be calculated using following formula:
See lessP=VI Or , I=P/V
We have; P = 2kW = 2000 W and V = 220 V
So, I=2000w/220V=9.09A
Here, the oven is drawing 9.09 ampere of current from a 5 ampere source.
This means there would be an overload on the circuit. This can result in accidental fire in the circuit.
Name two safety measures commonly used in electric circuits and appliances.
Earth wire and electric fuse
Earth wire and electric fuse
See lessChoose the correct option. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
(c) Half revolution
(c) Half revolution
See lessWhich sources produce alternating current?
AC generator
AC generator
See less