Electricity Magnetic and Heating Effects

📋 Course Outline

1. Magnetic effect of current
2. Magnetic field around a wire
3. Electromagnets and their poles
4. Strength and uses of electromagnets
5. Heating effect of current
6. Uses and risks of electrical heating
7. Voltaic cells and lemon cells
8. Dry cells and rechargeable batteries

📖 1. Magnetic effect of current

🔑 Key Concepts & Definitions

• magnetic effect of electric current : When electric current flows through a conductor such as a wire, it produces a magnetic field around it, and this phenomenon is called the magnetic effect of electric current.

📝 Essential Points

★ Must-know

• When current flows through a wire placed above a magnetic compass, the compass needle deflects, and when the current stops, the needle returns to its original direction.

Further detail

• The magnetic effect of a current-carrying wire disappears when the current stops flowing.
• Hans Christian Oersted discovered in 1820 that electric current produces a magnetic effect and showed that electricity and magnetism are linked.

📖 2. Magnetic field around a wire

🔑 Key Concepts & Definitions

• magnetic field : The region around a magnet or a current-carrying wire where its magnetic effect can be felt, such as by the deflection of a compass needle, is called a magnetic field.

📝 Essential Points

★ Must-know