Electricity
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Electricity
This is a foundational chapter on electricity. Focus on Ohm's law ($V = IR$), the factors affecting resistance ($R = \rho \frac{L}{A}$), and the heating effect of current ($H = I^2Rt$). Understand the difference between...
Sample questions with model answers
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Derive the expression for the equivalent resistance of three resistors connected in series.
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$R_{eq} = R_1 + R_2 + R_3$.
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Derive the expression for the equivalent resistance of three resistors connected in parallel.
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$1/R_{eq} = 1/R_1 + 1/R_2 + 1/R_3$.
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A house has 5 bulbs of 60 W each used for 4 hours daily, and a heater of 1500 W used for 2 hours daily. Calculate the energy consumed in a month of 30 days and the cost at ₹5 per unit.
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Energy = 126 kWh; Cost = ₹630.
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An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, what will be the power consumed?
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25 W (since $P \propto V^2$).
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