Understanding Conductors and Insulators

This video tutorial explains the concepts of conductors and insulators. It begins with an introduction to a simple electric circuit, demonstrating how a bulb lights up when the circuit is complete. The video then shows what happens when the circuit is broken and how it can be repaired using a conductor like an iron nail. It further explains the properties of conductors, including metals and certain non-metals, and highlights the importance of insulators in preventing electric shocks. The tutorial concludes with a summary of the key points about conductors and insulators.

What are the main components of a simple electric circuit as described in the video?

• A transformer, a relay, a motor, and a lamp

• A cell, a key, connecting wires, and a bulb

• A battery, a switch, a resistor, and a light

• A generator, a fuse, a capacitor, and a diode

Why does the bulb glow when the key is closed in the circuit?

• Because the circuit is broken

• Because the circuit is complete

• Because the bulb is faulty

• Because the wires are disconnected

What happens to the bulb when one of the connecting wires is cut?

• The bulb explodes

• The bulb glows dimmer

• The bulb glows brighter

• The bulb does not glow

What role does an iron nail play when connected to the free ends of the circuit?

• It insulates the circuit

• It completes the circuit

• It short-circuits the circuit

• It breaks the circuit

Which of the following is NOT a conductor of electricity?

• Plastic

• Iron nail

• Graphite

• Water

Why do human beings conduct electricity?

• Because they are made of plastic

• Because they are insulators

• Because they have metal in their body

• Because they have a large amount of water in their body

What is the purpose of covering wires with plastic?

• To make them look attractive

• To conduct electricity better

• To protect from electric shock

• To increase the current flow

Which materials are mentioned as insulators in the video?

• Iron, copper, and aluminum

• Plastic, rubber, and glass

• Gold, silver, and platinum

• Water, graphite, and human body

What is the main difference between conductors and insulators?

• Conductors are heavier than insulators

• Conductors are used in circuits, insulators are not

• Conductors are always metals, insulators are always non-metals

• Conductors allow electric current to flow, insulators do not

Which of the following is a conductor of electricity?

• Plastic

• Glass

• Rubber

• Graphite