Explanation

A device that decreases voltage is called a step-down transformer.

It's a type of transformer that takes a higher alternating current (AC) voltage and reduces it to a lower one. 

Explanation

Acceleration is the rate of change of velocity.

It describes how quickly an object's velocity changes over time, encompassing both changes in speed and direction. 

Explanation

Explanation

A transformer operates on the principle of electromagnetic induction,

Specifically mutual induction is the phenomenon between two or more coils of wire that are magnetically linked.

This means a changing magnetic field in one coil induces a voltage in the other. 

Explanation

A device that increases voltage is called a step-up transformer.

It is a type of transformer that takes an input voltage and increases it to a higher output voltage. 

Explanation

The fundamental formula for electric power is P = VI,

Where P is power, V is voltage, and I is current.

This formula can also be expressed as P = I²R or P = V²/R using Ohm's law (V=IR). 

Explanation

Decibel (dB) is the unit used to measure the loudness of sound.

The decibel scale is a logarithmic scale that quantifies sound intensity.

Sound levels are often measured in decibels using a sound level meter.

Explanation

Thermal conductivity is a measure of how well a material conducts heat.

The SI unit, W/(m·K), breaks down as follows: 

W (Watts): Represents the rate of heat transfer (energy per unit time).

m (meter): Represents the length or thickness of the material.

K (Kelvin): Represents the temperature difference.

Explanation

Time Period Definition:

The time period (usually denoted as 'T') is the duration of one complete cycle of a repeating event. 

SI Base Unit:

The second is the base unit of time in the International System of Units (SI). 

Explanation

Electromagnetic waves, like light and radio waves, do not require a medium to propagate.

They can travel through a vacuum, unlike mechanical waves which need a medium like air, water, or solids.