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.
An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.
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
See lessPower, P = V I = 220 x 5 = 1100 W
Energy consumed = P x t = 1100 W x 7200 s = 7,920,000 J
What 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..
Resistance of the circuit determines the rate at which energy is delivered by a current..
See lessAn electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s.
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
See lessHeat developed, H = I2 R t = 25 x 20 x 30 = 15,000 J = 1.5 x 104 J
Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
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
See lessHeat generated, H = VQ = 50Vx 96,000 C = 48,00,000 J = 4.8 x 106 J
Why does the cord of an electric heater not glow while the heating element does?
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.
See less