A water heater has a well insulated vertical cylindrical container of radius a in which water is filled to a height h. A resistor made of an alloy is used to heat the water in the tank from a temperature θ₁ to θ₂ (>θ₁) in a time interval Δt. The resistor wire has cross sectional radius b and its alloy material has resistivity ρ. Calculate the length of the resistor wire. Density and specific heat capacity of water are d and s respectively. The power source connected to the resistor has emf ε.
Physics · Current electricity · combination of cells and maximum power theorem
A water heater has a well insulated vertical cylindrical container of radius a in which water is filled to a height h. A resistor made of an alloy is used to heat the water in the tank from a temperature θ₁ to θ₂ (>θ₁) in a time interval Δt. The resistor wire has cross sectional radius b and its alloy material has resistivity ρ. Calculate the length of the resistor wire. Density and specific heat capacity of water are d and s respectively. The power source connected to the resistor has emf ε.
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