Explanation

Hazrat Hajra, the mother of Hazrat Ismail (AS), ran between the hills of Safa and Marwa seven times in search of water.

This act is commemorated during the Hajj pilgrimage, specifically in the ritual of Sa'i.

The running b/w Safa and Marwa seven times is called Sayee.

Explanation

A transistor is a semiconductor component that can be used either as a switch or an amplifier.

It controls the flow of electrical current in a circuit and is fundamental in electronic devices.

Explanation

Always select the maximum range of the current meter while measuring the current of an unknown wire.

This prevents potential damage to the meter and ensures accurate measurements if the current is unexpectedly high.

Explanation

Commutators and brushes are recommended for high DC voltage generators because they produce sparks.

This happens due to the intermittent contact, which helps in maintaining unidirectional current flow but requires careful management to avoid excessive sparking and wear.

Explanation

The practical use of a thermocouple's small electromotive force is mainly in instruments.

It is used for temperature measurement and control in various scientific and industrial applications.

Explanation

A residual-current device (RCD) is widely used in electrical circuits for shock safety.

It detects leakage currents and disconnects the circuit to prevent electric shocks.

Explanation

A measure of the ability of a material to resist the flow of an electric current is called resistivity.

It quantifies how strongly a material opposes electrical conduction.

Explanation

Liquids that conduct an electric current are called electrolytes.

They contain ions that move freely.

It allowing the electrical current to pass through.

Explanation

A short circuit is an electric circuit offering little or no resistance to the flow of electrons.

It often causing excessive current flow and potential damage.

It occurs when a direct path is created, bypassing the intended load.

Explanation

The voltage regulator is used in a vehicle to control the voltage produced at the output of the alternator.

It ensures the voltage remains within a specific range to protect the vehicle's electrical components.