A cell of internal resistance 1Ω supplies current to an...
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is
25%
33%
50%
75%
Correct answer is D
Efficiency = Output/input x 100/1
Efficiency = 3/(3+1) x 100/1
= 3/4 x 100/1 = 75%
The strength of an electromagnet increases with ...
One major reason why electrical appliances in homes are normally earthed is that the----------- ...
Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV ...
A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to wate...
The space surrounding a magnet in which the magnetic force is exerted is ...