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
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
How does the resistance of a pure metal change if its temperature decreases?
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Why are thick copper wires used as connecting wires?
State the effect of rise in temperature on the resistance of semi-conductors.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
What is the equivalent resistance between the points X and Y for the given network?
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.
Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
