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Taruna

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  1. Asked: October 20, 2020In: Class 10

    An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

    Taruna
    Added an answer on February 3, 2021 at 8:21 am

    Here, I = 5 A, V = 220 V, t = 2h = 7,200 s Power, P = V I = 220 x 5 = 1100 W Energy consumed = P x t = 1100 W x 7200 s = 7,920,000 J

    Here, I = 5 A, V = 220 V, t = 2h = 7,200 s
    Power, P = V I = 220 x 5 = 1100 W
    Energy consumed = P x t = 1100 W x 7200 s = 7,920,000 J

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  2. Asked: October 20, 2020In: Class 10

    What determines the rate at which energy is delivered by a current?

    Taruna
    Added an answer on February 3, 2021 at 8:17 am

    Resistance of the circuit determines the rate at which energy is delivered by a current..

    Resistance of the circuit determines the rate at which energy is delivered by a current..

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  3. Asked: October 20, 2020In: Class 10

    An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s.

    Taruna
    Added an answer on February 3, 2021 at 8:16 am

    Here, R = 20 Ω, i = 5 A, t = 3s Heat developed, H = I2 R t = 25 x 20 x 30 = 15,000 J = 1.5 x 104 J

    Here, R = 20 Ω, i = 5 A, t = 3s
    Heat developed, H = I2 R t = 25 x 20 x 30 = 15,000 J = 1.5 x 104 J

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  4. Asked: October 20, 2020In: Class 10

    Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.

    Taruna
    Added an answer on February 3, 2021 at 8:15 am

    Here, Q = 96,000 C, t =1 hour = 1 x 60 x 60 sec = 3,600 s, V = 50 V Heat generated, H = VQ = 50Vx 96,000 C = 48,00,000 J = 4.8 x 106 J

    Here, Q = 96,000 C, t =1 hour = 1 x 60 x 60 sec = 3,600 s, V = 50 V
    Heat generated, H = VQ = 50Vx 96,000 C = 48,00,000 J = 4.8 x 106 J

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  5. Asked: October 20, 2020In: Class 10

    Why does the cord of an electric heater not glow while the heating element does?

    Taruna
    Added an answer on February 3, 2021 at 8:14 am

    Heat generated in a circuit is given by I2R t. The heating element of an electric heater made of nichrome glows because it becomes red-hot due to the large amount of heat produced on passing current because of its high resistance, but the cord of the electric heater made of copper does not glow becaRead more

    Heat generated in a circuit is given by I2R t. The heating element of an electric heater made of nichrome glows because it becomes red-hot due to the large amount of heat produced on passing current because of its high resistance, but the cord of the electric heater made of copper does not glow because negligible heat is produced in it by passing current because of its extremely low resistance.

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