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a) Consider the circuit in the figure. How much energy is absorbed by electrons from the initial state of no current to the state of drift velocity? b) Electrons give up energy at the rate of RI2 per second to the thermal energy. What time scale would one associate with energy in problem a) n = no of electron/volume = 1029/m3, length of circuit = 10 cm, cross-section = A = 1mm2
a) Consider the circuit in the figure. How much energy is absorbed by electrons from the initial state of no current to the state of drift velocity? b) Electrons give up energy at the rate of RI2 per second to the thermal energy. What time scale would one associate with energy in problem a) n = no of electron/volume = 1029/m3, length of circuit = 10 cm, cross-section = A = 1mm2
CBSE | Class 12 | Current Electricity | Lakhmir Singh | NCERT Exemplar | Physics
a) Consider the circuit in the figure. How much energy is absorbed by electrons from the initial state of no current to the state of drift velocity? b) Electrons give up energy at the rate of RI2 per second to the thermal energy. What time scale would one associate with energy in problem a) n = no of electron/volume = 1029/m3, length of circuit = 10 cm, cross-section = A = 1mm2

a) Current is given as I = V/R from the Ohm’s law

Therefore, I = 1A

But, I = ne Avd

vd = I/neA

When the values for the above parameters are substituted, vd = 1/1.6 × 10-4 m/s

The KE = (KE of one electron)(no.of electrons) = 2 × 10-17J

b) Power loss, P = I2R = 6 J/s

P = E/t

E = Pt

t = E/P = 10-17 s

Current electricity which is also known as Electric current can simply be defined as the flow of electric charge that takes place. The charge that usually occurs takes place, with the help of electrons moving through the wire. The charge present can be either ion in an electrolyte or through the ionised gas called plasma.

i

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