Determine the percentage by which the illumination of a lamp will decrease if the current drops by 20%.

By what percentage will the illimination of the lamp decrease if the current drops by 20% ?

Statement I : If the current of a lamp increases by 20 % , the percentage increases in the illlumination of the lamp is 40% . Statement II : Illumination of the lamp is directly proportional to the square of the current through the lamp.

Statement I : If the current of a lamp increases by 20 % , the percentage increases in the illlumination of the lamp is 40% . Statement II : Illumination of the lamp is directly proportional to the square of the current through the lamp.

if the electrc current in a lamp decreases by 5% then the power output decreases by

How many percentage of the volume of a right circular cone will be increased or decreased if its radius of base is increased by 20% and its height is decreased by 10% ?

If the price of petrol is increased by 20%,by what percentage should the consumption be decreased by the consumer, if the expenditure on petrol remains unchanged?

By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 20% at a constant temperature?

By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 20% at a constant temperature?