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Smoke cell
Because smoke particles are light and can scatter light rays shining on them.
Because smoke particles are light and can scatter light rays shining on them.
See lessMagnetism
The strength of a magnet is stronger at the ends because magnetic field lines are very close to each other. Consequently, magnetic flux density is maximum. Hence, poles have stronger attracting power.
The strength of a magnet is stronger at the ends because magnetic field lines are very close to each other. Consequently, magnetic flux density is maximum. Hence, poles have stronger attracting power.
See lessMagnetism and electrical
Repulsion only occurs when two like poles of a magnet exist while attraction can occur between unlike poles of a magnet and/or between a magnet and a magnetic material.
Repulsion only occurs when two like poles of a magnet exist while attraction can occur between unlike poles of a magnet and/or between a magnet and a magnetic material.
See lessTransformers
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 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.
Appliances
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