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Transformers
We must first understand the working principle of a transformer - Faraday's Law of Electromagnetic Induction. A transformer needs an alternating current that will create a changing magnetic field. A changing magnetic field also induces a changing voltage in a coil. Whereas in D.C, current will be coRead more
We must first understand the working principle of a transformer – Faraday’s Law of Electromagnetic Induction.
A transformer needs an alternating current that will create a changing magnetic field. A changing magnetic field also induces a changing voltage in a coil.
Whereas in D.C, current will be constant there will be no alternating current to create magnetic field . Due to this there is no change in magnetic field voltage induces will be zero.
Also, a transformer has high inductance and low resistance. In dc supply there is no inductance only resistance will act in the circuit so high current will flow through the primary of the transformer. For this reason the coil and insulation will burn out. So DC can’t be used .
See lessCurrent Electricity
Let's use the analogy of a flowing river. Here, voltage will be equated to the steepness or pitch of the river while amperage will be equated with the volume of the water in the river. An electrical current with high voltage but very low amperage can be seen as a very narrow, small river flowing neaRead more
Let’s use the analogy of a flowing river. Here, voltage will be equated to the steepness or pitch of the river while amperage will be equated with the volume of the water in the river.
An electrical current with high voltage but very low amperage can be seen as a very narrow, small river flowing nearly vertical, like a tiny trickle of a waterfall. It would have little potential to really hurt you. But a large river with lots of water (amperage) can drown you even if the speed of flow (voltage) is relatively slow.
It is clear now that amperage creates the risk of an electrical shock. Below is a summary of effects of electrical shocks with their amperage levels.
1 to 10 mA: Little or no electrical shock is felt.
10 to 20 mA: Painful shock, but muscle control is not lost.
20 to 75 mA: Serious shock, including a painful jolt and loss of muscle control; the victim cannot let go of wire or another source of shock.
75 to 100 mA: Ventricular fibrillation (uncoordinated twitching of ventricles) of the heart can occur.
100-200 mA: Ventricular fibrillation occurs, often resulting in death.
Over 200 mA: Severe burns and severe muscle contractions occur. Internal organs can be damaged. The heart can stop due to chest muscles applying pressure to the heart, but this clamping effect can prevent ventricular fibrillation, greatly improving the chances of survival if the victim is removed from the electrical circuit.
In conclusion, follow all standard safety procedures for all electrical work to avoid risk of electrical shock.
See lessTransformers
in transformer power is conserved on both ends hence no amplification
in transformer power is conserved on both ends hence no amplification
See lesscurrent electricity
This is because of the cell defects like polarisation which means that there will be accumulation of hydrogen bubbles inside the copper plate of the cell. This will results into the increase of resistance in the cell, as the cell starts becoming more insulating than conductor. Thus current falls rapRead more
This is because of the cell defects like polarisation which means that there will be accumulation of hydrogen bubbles inside the copper plate of the cell.
This will results into the increase of resistance in the cell, as the cell starts becoming more insulating than conductor. Thus current falls rapidly.
Also local action is another whereby zinc plate is eaten away
See lessmagnetic effect
Strength of a magnet can be increased by: 1. increasing the number of turns on the coil 2. increasing the current 3. pushing the turns closer so as to reduce the length of the solenoid.
Strength of a magnet can be increased by:
See less1. increasing the number of turns on the coil
2. increasing the current
3. pushing the turns closer so as to reduce the length of the solenoid.
Working of a transformer
Transformer works under principle of mutual induction. Voltage from a battery can be stepped up since it is d.c
Transformer works under principle of mutual induction. Voltage from a battery can be stepped up since it is d.c
See lessP-type semi-conductor
A group to three atom (Boron, Indium)- acceptor atom, is used as an impurity to bond covalently in the lattice of a pure semi-conductor (Silicon). Of the four electrons of silicon, three are used to bond with three electrons of Boron, leaving one electron unbounded. There's thus a hole created, withRead more
A group to three atom (Boron, Indium)- acceptor atom, is used as an impurity to bond covalently in the lattice of a pure semi-conductor (Silicon). Of the four electrons of silicon, three are used to bond with three electrons of Boron, leaving one electron unbounded. There’s thus a hole created, with silicon, which contributes for bonding with Boron, thus holes become majority charge carriers. This results to a semi-conductor called p-type (extrinsic semi-conductor)
See lessApplication of capacitor
The capacitor gets charged thereby preventing sparking at the contact. Instead of sparking, the discharge at the contact is used to charge the capacitor.
The capacitor gets charged thereby preventing sparking at the contact. Instead of sparking, the discharge at the contact is used to charge the capacitor.
See lessCharged Particle
A moving charged particle produces a magnetic field which exerts a force on other moving charges. This charged particle produces an electromagnetic wave.
A moving charged particle produces a magnetic field which exerts a force on other moving charges. This charged particle produces an electromagnetic wave.
See lessAppliances
1. It helps in opening up the shutters, which facilitates the insertion of the other pins, that is, N and L. 2. For ensuring that the Earth pin makes contact first when plugged in and last when plugged out so as to avoid chances of an electric shock.
1. It helps in opening up the shutters, which facilitates the insertion of the other pins, that is, N and L.
2. For ensuring that the Earth pin makes contact first when plugged in and last when plugged out so as to avoid chances of an electric shock.
See less