Benjamin Franklin invented the lightning conductor in the 18th century. His invention provided a method to protect buildings and structures from lightning damage by safely directing the electrical discharge into the ground.
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The resistance of the filament is more than that of the wires. The filament glows because its high resistance causes it to heat up and emit light when current flows through it. In contrast, the wires have much lower resistance, ...
The principle of a fuse is based on the thermal effect of electricity. A fuse wire melts due to the heat generated by an excessive current, thereby breaking the circuit and preventing damage. This thermal effect ensures that the fuse ...
The potential difference between the ends of a conductor is proportional to the current flowing through it. This relationship is defined by Ohm’s law, which states that the voltage across a conductor (potential difference) is directly proportional to the current ...
Earth is used in electrical equipment primarily for safety. It provides a path to dissipate fault currents safely into the ground, preventing electric shocks, fires, and damage to equipment. This grounding ensures that in case of a fault, such as ...
In electrical fittings, a wire is connected to ground primarily to provide a safe path for electrical current in case of a fault, such as a short circuit. This connection directs excessive current away from sensitive equipment and prevents electric ...
The characteristic of a superconductor is zero permittivity. Superconductors exhibit the unique property of having no electrical resistance when cooled below a certain critical temperature, allowing electric current to flow without any energy loss. This phenomenon is utilized in various ...
The force between two electric charges is related to Coulomb’s law. This law describes how the electric force between two charged objects depends on the amount of charge on each object and the distance between them. Coulomb’s law is fundamental ...
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass. The higher refractive index of glass indicates that light interacts more with the glass material, causing it to ...
Photon is the basic unit/quantity of light. It is a discrete packet of electromagnetic energy that exhibits both particle-like and wave-like properties. Photons carry specific amounts of energy depending on their frequency, and they are fundamental to various phenomena in ...