Question

If a 12v water heater takes a current of 2A and it is turned on for 30 seconds what do you think how much thermal energy it produce?

Answer 1

$\huge\sf\pink{Answer}$

☞ Heat produced is 720 J

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$\huge\sf\blue{Given}$

✭ Voltage (V) = 12 V

✭ Current (I) = 2 A

✭ Time (t) = 30 sec

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$\huge\sf\gray{To \:Find}$

◈ Heat energy produced?

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$\huge\sf\purple{Steps}$

So here we shall first find the resistance of the circuit with the help of the Ohm's Law, that is,

$\underline{\boxed{\sf V = IR}}$

Substituting the given values,

➝ $\sf V = IR$

➝ $\sf 12 = 2\times R$

➝ $\sf \dfrac{12}{2} =R$

➝ $\sf \red{R = 6 \ \Omega}$

The heat produced is given by,

$\underline{\boxed{\sf H = I^2Rt}}$

Substituting the values,

➳ $\sf H = I^2Rt$

➳ $\sf H = 2^2 \times 6 \times 30$

➳ $\sf H = 4 \times 6 \times 30$

➳ $\sf \orange{H = 720 \ J}$

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