Electric Circuits and Fuses Concepts

The video tutorial covers the basics of electric circuits, including the symbols used in circuit diagrams, the heating effect of electric current, and the role of electric fuses in safety. It explains how electric current causes heating in wires and the importance of using appropriate materials. The tutorial also discusses different types of fuses and safety devices like MCBs, which protect circuits from overloads and short circuits. The lesson concludes with a summary and assessment to reinforce learning.

What is the primary function of an electric iron?

• To generate electricity

• To cool down appliances

• To heat and press clothes

• To light up a room

Which symbol represents a closed switch in a circuit diagram?

• A broken line

• A continuous line

• A circle

• A triangle

What does the longer line in the symbol of an electric cell represent?

• Negative terminal

• Positive terminal

• Neutral terminal

• Ground terminal

What happens when an electric current passes through the filament of a bulb?

• The bulb changes color

• The bulb becomes hot and emits light

• The bulb emits sound

• The bulb cools down

What is the purpose of an electric fuse in a circuit?

• To increase current flow

• To prevent circuit overload

• To decrease voltage

• To enhance light emission

What is a plug fuse primarily used for?

• Industrial machinery

• Portable devices

• Household circuits

• Automobiles

Which type of fuse is commonly used in electrical appliances?

• Resettable fuse

• Miniature circuit breaker

• Cartridge fuse

• Plug fuse

What is the main advantage of a miniature circuit breaker (MCB) over a traditional fuse?

• It is cheaper

• It can be reset after tripping

• It conducts more current

• It is smaller in size

What material is commonly used in fuse wires due to its low melting point?

• Iron

• Copper

• Aluminum

• Tin and lead alloy

What happens to a fuse wire when the current exceeds a certain value?

• It glows brightly

• It becomes magnetic

• It changes color

• It melts and breaks the circuit