Advertisements
Advertisements
प्रश्न
Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.
Advertisements
उत्तर
R = 75 Ω, i = 2A, t = 2 minutes = 2 × 60 s = 120 s
Heat energy produced in the coil, H = i2Rt
= 22 × 75 × 120
= 300 × 120 = 36000 J
APPEARS IN
संबंधित प्रश्न
Find the expression for resistors connected in series.
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
What is the resistance between A and B in the figure given below?
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
State the effect of rise in temperature on the resistance of semi-conductors.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
Write an expression for calculating electrical power in terms of current and resistance.
What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in them is in the ratio:
