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प्रश्न
Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?
She wrote: Three-pin connections reduce heating of connecting wires.
- Is her answer correct or incorrect? Justify.
- What is the function of a fuse in a domestic circuit?
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उत्तर
- Anannya’s answer is wrong. Electrical appliances with metallic bodies need an earth wire which provides a low resistance conducting path to the flow of current, in case there is an accidental leakage of current through the conducting body of the appliances.
- An electrical fuse is a safety device that operates to provide protection against the overflow of current in an electrical circuit. An important component of an electrical fuse is a metal wire or strip that melts when excess current flows through it.
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संबंधित प्रश्न
Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?
The current passing through an electric kettle has been doubled. The heat produced will become:
(a) half
(b) double
(c) four time
(d) one-fourth
The electricity bill specifies the usage in _______.
True or False – If False give the correct answer
The fuse wire does not melts whenever there is overload in the wiring.
Heating effect of current is called ______
Which of the following is correct?
An MCB can be used instead of a fuse in an electrical circuit.
Explain the working of an electric fuse.
Define the following:
Electrolyte
When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.
