Light and Electric Current in Science

6 Questions

What is the speed of light in a vacuum?

299,792 kilometers per second

Which property of light determines its color?

Both wavelength and frequency

Which scientist proposed the concept of positive and negative charges based on experiments with oil and wax?

Benjamin Franklin

What is the effect when an electric current flows through a circuit and generates heat due to electrical resistance?

Joule heating

What is the cause of the magnetic field generated by a varying electric current?

Electromagnetic induction

Which of the following is NOT a branch of science?

Philosophy

Study Notes

Science

Science is a systematic approach to understanding the natural world through observation and experimentation. It is divided into many branches, each focused on specific aspects of our universe. Three key areas within science are light, electric current, and their effects.

Light

Light refers to electromagnetic radiation within a certain part of the electromagnetic spectrum that is visible to humans. It has various properties such as wavelength and frequency, with different colors corresponding to different frequencies. The speed of light in a vacuum is approximately 299,792 kilometers per second, which is considered constant.

Electric Current

An electric current is the flow of electric charge, often due to the movement of electrons. This can occur within conductive material like copper or aluminum, through the use of batteries or generators. The nature of electric charges was first understood by Benjamin Franklin, who proposed the concept of positive and negative charges based on oil and wax experiments.

Electric current has several effects. For instance, when an electric current flows through a circuit, it generates heat due to electrical resistance. This phenomenon is called Joule heating. Additionally, varying electric currents can cause magnetic fields, leading to electromagnets.