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### Course: Middle school physics>Unit 2

Lesson 7: Electromagnetism

# Electromagnetism

Review your understanding of electromagnetism in this free article aligned to NGSS standards.

## Key points:

• When electric charges move, they create magnetic fields in the space around them.
• Electric charges moving through a wire create electric current.
• Because electric currents are made up of moving charges, they create magnetic fields. An electromagnet is a coil of wires that becomes a magnet when electric current runs through it.
• Electromagnets only work when the electric current is turned on.
• Increasing the electric current or increasing the number of wire loops increases the strength of the electromagnet.
• Changing the magnetic field around a coil of wire (by moving a magnet nearby) can create electric current in the wire.
• Increasing the speed of the moving magnet, using a stronger magnet, or increasing the number of wire loops produces more electric current.
• Moving the coil of wire around a magnet will also create electric current.

## Want to join the conversation?

• What can electromagnets be used for?
• Generators, motors, transformers, and a lot more.
• why do we need electromagnets to help us with technology?
• Electromagnetism is an extremely important field. You use forms of electromagnetism everyday, from turning on a lamp, turning on a microwave, doing laundry. Motors in these devices are created with electric currents which are created from your power company using electromagnetism to produce electricity which travels through power lines into your home's power system, powering your house. So, by reading this, typing on your computer, you are using electromagnetism for your technology.
• what if we never had eletromagnets
• (written by AI) electromagnets have a profound impact on our daily lives and are integral to numerous technological advancements. Without them, our ability to generate electricity, power devices, communicate, conduct medical diagnoses, and pursue scientific research would be severely limited, but humans could still live
• How can sun get blocked by the moon if the sun is way bigger?
• The Sun is completely blocked in a solar eclipse because the Moon passes between Earth and the Sun. Even though the Moon is much smaller than the Sun, because it is just the right distance away from Earth, the Moon can fully blocks the Sun’s light from Earth’s perspective.
• This is really interesting but also quite difficult to wrap your head around. Will we further delve into this topic in High School and College Physics?
• Probably
• Why does everything have energy
• Everything in the universe has energy because energy is a fundamental property of matter and particles. At the most basic level, all matter is made up of tiny particles called atoms, and these atoms contain energy. Fun fact, Energy is conserved, meaning it cannot be created or destroyed, but it can be converted from one form to another.
• how doses the magnetic force transfor from the particals to the wire?