Electromagnetic induction

The video explains electromagnetic induction, which occurs when a conductor is placed in a changing magnetic field. This principle is used in power stations to generate electricity by spinning a coil inside a magnetic field, inducing a current. Additionally, electromagnetic induction enables wireless charging of devices like mobile phones, where an alternating current in a transmitter coil creates a magnetic field that induces a current in the phone's receiver coil, charging the battery.

What is required for voltage to be induced in a conductor?

• A changing magnetic field

• A constant electric current

• A static electric charge

• A stationary magnetic field

How do large generators produce electrical power?

• By spinning a coil of wire inside a magnetic field

• By heating a coil of wire

• By using wind turbines

• By using solar panels

What is the role of a transmitter coil in wireless charging?

• To connect the phone to the power source

• To convert direct current to alternating current

• To create an electromagnetic field

• To store electrical energy

What type of current is transformed by the phone during wireless charging?

• Static current to dynamic current

• Alternating current to direct current

• Direct current to alternating current

• Dynamic current to static current

Which of the following is an application of electromagnetic induction?

• Solar energy conversion

• Wind energy generation

• Wireless charging of mobile devices

• Hydroelectric power generation