An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Let's go through each part of the question step-by-step:
B. Fill in the blanks:
The Earth is surrounded by a layer of air.
The layer of air surrounding the Earth is known as the atmosphere. It is composed of various gases, including nitrogen, oxygen, carbon dioxide, and others, which are vital for maintaining life on Earth.
The Earth is farthest from the Sun in the month of July .
This point in Earth's orbit is known as aphelion, and it occurs around early July each year. Despite being farther from the Sun, the Northern Hemisphere experiences summer due to the tilt of the Earth's axis.
The Earth rotates on its axis once in 24 hours.
Earth's rotation on its axis is responsible for the cycle of day and night. It completes one full rotation approximately every 24 hours.
Rivers and seas are small bodies of water .
Bodies of water include various forms such as rivers, seas, lakes, and oceans, each playing a significant role in the Earth's hydrological cycle.
A large landmass is called a continent .
Continents are large, continuous areas of land such as Africa, Asia, or North America. There are seven continents on Earth.
C. Write (T) for true statements and (F) for false statements:
The layer of air surrounding the Earth is called revolution. (F)
This is false. The layer of air is called the atmosphere. Revolution refers to Earth's orbit around the Sun.
The Earth is the only planet that has life. (T)
As of current knowledge and discoveries, Earth is the only known planet with life.
Nearly 30% of the Earth is covered with land. (T)
Approximately 29-30% of the Earth's surface is land, while the remainder is covered by oceans.
The Earth moves around the Moon. (F)
This is false. The Earth orbits around the Sun, and the Moon orbits around the Earth.
The surface of the Earth is even. (F)
This is false. The Earth's surface is uneven, composed of various terrains like mountains, valleys, and plains.
In 30 seconds, a current of 15.0 A results in a total charge of 450 coulombs flowing through an electric device. This corresponds to approximately 2.81 x 10²¹ electrons. Hence, a vast number of electrons move through the device during this time period.
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