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प्रश्न
Unscramble the following words:
SFEU
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उत्तर
FUSE
APPEARS IN
संबंधित प्रश्न
How does the resistance of a wire vary with its area of cross-section?
How much heat will an instrument of 12 W produce in one minute if it is connected to the heat produced by it?
Explain the application of heating effect of electric current in an electric bulb with a diagram.
(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.
(b) Is it safe to handle the bulb when the switch is OFF?
(c) Give a reason for your answer in (b).
Your teacher has shown you the following activity.
Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the following figure. The current is switched on and some pins are placed near the ends of the nail.
Write down any three questions that come to your mind about this activity.
What are the factors affecting heating effect of electric current?
A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.
Define the following:
Electrolyte
In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.
| A | B | C | D |
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Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.
