An electric kettle consumes 1KW of electric power when operated at 220V. A fuse wire of what rating must be used for it?
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A servo voltage stabiliser restricts the voltage output to 220V ± 1%. If an electric bulb rated at 220V,
Output voltage = 220 ± 1% 1% of 220V = 2.2v The resistance of bulb R = V2/P = (220)2/100 = 484Ω (a) For minimum power consumed V1 = 220 – 1% =...
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An immersion heater rated 1000W, 220V is used to heat 0.01m^3 of water.
P = 1000 V = 220v R = V2/P = 48400/1000 = 48.4Ω Mass of water = 1/100 x 1000 = 10kg Heat required to raise the temp. of given amount of water =...
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A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?
(c) A fuse is a type of sacrificial overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows. Short circuit, overload...
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A 220V, 100W Bulb is connected to a 110V source. Calculate the power consumed by the bulb?
correct answer is (b) 15W.
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A consumer consumes only two Goods X and Y. The Marginal Rate of Substitution is 1. Prices of X and Y are Rs.3 and Rs.4 per unit respectively.
The Consumer is not in equilibrium because: MRS> Px/Py or 3/4 Since the consumer is willing to pay more for Good X than the market requires, the consumer will buy more of...
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A consumer consumes only two Goods X and Y. The Marginal Rate of Substitution is 2. Prices per unit of X and Y are Rs. 5 and Rs.4 respectively.
The Consumer is not in equilibrium because: MRS> Px/Py or 2>5/4 The consumer is prepared to pay more for one more unit of X than market demands. So, he will buy more of X...
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A consumer consumes only two Goods X and Y. Marginal Rate of Substitution is 3 and per unit prices of X and Y are Rs. 4 and Rs.2 respectively.
The Consumer is not in equilibrium because : MRS> Px/Py or 3> 4/2 Since the consumer is prepared to pay more for X than market demands, consumer will buy more of X...
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A consumer consumes only two goods X and Y and is in equilibrium. Show that when the price of good X rises, the consumers buys less of good X.
According to the utility analysis, the consumer is in equilibrium when MUx/Px=MUy/Py=MUm Now, given that Px rises, then MUx/Px< MUy/Py Since per rupee MUx is lower than per rupee MUy, the consumer will buy...
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A consumer consumes only two goods X and Y and is in equilibrium. Show that when price of good X falls,
According to the utility analysis, the consumer is in equilibrium when: MUx/Px=MUy/Py=Mum Now, given that Px falls,then MUx/Px> MUy/Py Since per rupee MUx is higher than per rupee MUy the consumer will buy more units...
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How does use of a fuse wire protect electrical appliances
If a current larger than a specified value flows in a circuit, temperature of fuse wire increases to its melting point. The fuse wire melts and the circuit breaks.
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