Physics

A bulb rated 12 V, 24 W operates on a 12 volt battery for 20 minutes. Calculate —
(i) the current flowing through it, and
(ii) the energy consumed.

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(i) Given,

Voltage (V) = 12 V

Power (P) = 24 W

Current (I) = ?

From relation,

Power (P) = VI

Substituting the values in the formula above, we get,

$24 = 12 \times I \\[0.5em] \Rightarrow I = \dfrac{24}{12} \\[0.5em] \Rightarrow I = 2 A$

Hence, the current flowing through it = 2 A

(ii) Energy (E) = P × t

Time (t) = 20 min = 1200 sec

$E = 24 \times 1200 \\[0.5em] E = 28,800 J$

Hence, energy consumed = 28,800 J

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