A room $$at200C$$ C is heated by a heater of resistance $$20$$ ohms connected to $$200$$ V mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area $$1m2$$ and thickness $$0.2$$ cm. Calculate the temperature outside [K for glass is $$0.2$$ $$cal/m/0C$$ and J $$=$$ $$4.2$$ $$J/cal$$]

Question

A room $$at200C$$ C is heated by a heater of resistance $$20$$ ohms connected to $$200$$ V mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area $$1m2$$ and thickness $$0.2$$ cm. Calculate the temperature outside [K for glass is $$0.2$$ $$cal/m/0C$$ and J $$=$$ $$4.2$$ $$J/cal$$]

Infinity Learn · Accepted Answer

$$Qt=$$ KAθ$$1-$$θ$$2x$$ $$v2R$$ $$=KA$$θ$$1-$$θ$$2x$$ here K $$=$$ $$0.2$$ $$x4.2$$     $$A=1$$ $$m2$$     θ$$1=20$$ $$x=2$$ $$x10-3$$  v $$=$$ $$200$$ and $$R=$$ $$20$$

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A room at200C C is heated by a heater of resistance 20 ohms connected to 200 V mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area 1m2 and thickness 0.2 cm. Calculate the temperature outside [K for glass is 0.2 cal/m/0C and J = 4.2 J/cal]

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