A 40KW electric cable was uses to transmit electricity th...
A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is
4.0 x 102W
5.0 x 102W
4.0 x 103W
5.0 x 103W
Correct answer is D
In general, Power = IV; ⟹40KW=IVTherefore 40000=1×800⟹I=40000800=50A,tune the current through
Resistor = 50A
power loss= I2R = 502 x 2
= 2500 x 2 = 5.0 x 103W
A note of frequency of 2000Hz has a velocity of 400ms−1. What is the wavelength of the note?...
The diagram above is an illustration of an a.c. circuit.Calculate the reactance of the capacito...
As the pressure of a fluid increases, its viscosity ...
Which of the following are contact forces? I. Force of tension II. Force of fiction, III. Magne...
Which of the following statements is not correct? ...
A battery of e.m.f 3.0V is connected across a potentiometer wire AB of length 10Ωm−1 as...
A platinum resistance thermometer has a resistance 4Ω at 0°C and 10Ω at 100&de...
Which part of the human eye performs the same function as the diaphragm in a lens camera? ...