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प्रश्न
Why is the heating element of an electric oven wound on a helix? State the reason.
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उत्तर
In an electric oven, the china clay plate is provided either with lateral grooves or grooves in the form of a spiral helix. This type of spiral winding reduces the area of spread of nichrome wire and helps to concentrate heat in a small region.
संबंधित प्रश्न
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
A potential difference of 6 V is applied across a 3 Ω resistor. What is the current flowinq throuqh the circuit?
An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:
- the power of bulb and
- the potential difference at its end.
What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
What is the resistance of an appliance rated at V volt, P watt?
An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. Calculate:
(i) the current drawn,
(ii) the electrical energy consumed in 60 hours,
(iii) the cost of electrical energy consumed at Rs. 2.50 per kWh.
