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John Arcadia
John Arcadia asked in Science & MathematicsPhysics · 6 years ago

PHYSICS HOMEWORK HELP: Electrical Fields?

Some stoves use the heat produced by current flowing through a conductor. If the heating element (conductor) has a resistance of 30 ohms, how long will the burner have to work to heat 500 g of 30°C water up to its boiling point? The specific heat of water is 4.19 x 103 J/kg·°C, and the household voltage is (120V).

Can you please list out all the steps required? I've tried to solve this twice, but ended up with the wrong answer.

1 Answer

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  • D g
    Lv 7
    6 years ago

    You need the power used by the heater

    like 1200w heater is half the power of 2400w

    P = IxV

    P = V^2/R

    We had V and R

    Using I =V/R

    I CHANGED the formula

    p = 120^2/ 30

    P = 120 x 4 = 480 W

    Watts = J / second

    Now use this to heat the water there is a transition from water to water vapour I think you have to account for that

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