GCSE Physics - How Transformers Work #82

The video explains how electricity is generated and distributed in the UK using the National Grid. It highlights the role of transformers in increasing and decreasing voltage to minimize energy loss. The video details the components of a transformer, including the iron core and coils, and describes the process of transferring electricity through induced magnetic fields. It also explains how transformers adjust voltage levels based on the number of coil turns, using examples of step-up and step-down transformers.

What is the primary purpose of using step-up transformers in the National Grid?

• To decrease the voltage

• To increase the current

• To convert AC to DC

• To minimize energy losses during transmission

What connects the primary coil to the secondary coil in a transformer?

• Magnetic field

• Iron core

• Plastic insulation

• Copper wire

How does the alternating potential difference in the primary coil affect the transformer?

• It induces an alternating magnetic field in the iron core

• It directly transfers electricity to the secondary coil

• It creates a static magnetic field

• It increases the resistance in the circuit

In a step-up transformer, what happens if the secondary coil has more turns than the primary coil?

• The current increases

• The voltage increases

• The voltage remains the same

• The voltage decreases

Why can't electricity pass directly between the wire and the iron core in a transformer?

• The wires are insulated in plastic

• The current is too weak

• The iron core is non-conductive

• The magnetic field blocks the electricity