Question

An electric heater of resistance 8 ohm draws 15C of charge per second. Suppose it happens for a period of 2 hours calculate the amount of heat energy derived by the heater?



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Answer 1

Answer:

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Answer 2

$\bold{\underline{\underline{\red{Given~ parameters}}}}$

${:⇒\sf\pink{The~ resistance ~of~ the~ electric~ heater~ (R) = 8 Ω}}$

${:⇒}$$\sf\pink{Current~ drawn~ (I) = 15~ A}$

${:⇒}$$\sf\pink{Time = 2~ hrs}$

${:⇒}$$\sf\pink{T = 120 ~min ×60}$

${:⇒}$$\sf\pink{Time~ (T) = 7200 ~secs}$

$\longrightarrow$ The rate of heat produced by the device in terms of power is expressed as

The heat developed in heater can be calculated using the formula

${↪}$$\tt\purple{H = I²RT}$

${↪}$$\tt\purple{H = 15 × 15 × 8 × 7200}$

${↪}$$\tt\purple{H = 12960000}$

${↪}$$\tt\purple{H = 1296 × 10⁴ J}$