How much heat will be produced by a heater of 24w in 2 min if it is connected to a battery of 12 volts

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Solution

Dear student,

Power = 24 W
Generally if the power rating is given, it is given along with voltage rating also.
So, it is connected to a battery with 12 V.
Power = Voltage $\times$ current
current = $\frac{p o w e r}{v o l t a g e}$ = 24/12 = 2A
Time = 2 min = 2 $\times$ 60 seconds = 120 seconds

Heat energy = Voltage(V) $\times$ current (I) $\times$ time (t)
= $12 \times 2 \times 120$
= 2880 Joules

Regards

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