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प्रश्न
Name some devices that run using heat effect of electric current
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उत्तर
Electric bulb, geyser, Iron box.
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संबंधित प्रश्न
How does the resistance of a wire vary with its area of cross-section?
Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.
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What property of the filament wire accounts for this difference?
Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.
Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.
Explain the application of heating effect of electric current in an electric bulb with a diagram.
How does use of a fuse wire protect electrical appliances?
(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).
Unscramble the following words:
SFEU
An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in
- kilowatt hour and
- joules.
