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Current Electricity — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsCurrent Electricity3 Marks
Question
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
✓

Answer

Given, current, I= 0.2 A; p.d. = 15 V
(i) A/C to Ohm's law V=IR
$\mathrm{R}=\frac{\mathrm{v}}{\mathrm{l}}=\frac{15}{0.2}=75 \Omega$
(ii) energy produced in one minutes is:
$\mathrm{H}=\mathrm{I}^2 \mathrm{Rt}=(0.2)^2 \times 75 \times 60=180 \mathrm{~J}$

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