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Five identical bulbs rated as 100 W, 250 V are connected as shown in the figure with a battery of emf ε=260 V and internal resistance 20 Ω. Find power loss in the bulb A in watts.
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Important Questions on Heating Effects of Current

MEDIUM
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Concept application Excercise>Q 6
A house is fitted with certain numbers of 100 W, 230 V incandescent lamps. The power to the house is fed by a generator producing the power at 240 V. The resistance of the wires from the generator to the house is 2 Ω. Find the maximum number of lamps that can be illuminated so that the voltage across none of the lamps drops below 230 V.
MEDIUM
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Exercise>Q 15
A 20 V battery with an internal resistance of 5 Ω is connected to a resistor of x Ω . If an additional 6 Ω resistor is connected across the battery, find the value of x in Ω, so that external power supplied by the battery remains the same.
EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 1
Two electric bulbs marked 25 W-220 V and 100 W-220 V are connected in series to a 440 V supply. Which of the bulbs will fuse?
MEDIUM
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 2
The supply voltage to a room is 120 V. The resistance of the lead wires is 6 Ω. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?
EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 3
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be
EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 1
Incandescent bulbs are designed by keeping in mind that the resistance of the filament increases with the increase in temperature. If at room temperature, 100 W, 60 W, and 40 W bulbs have filament resistances R100, R60, and R40, respectively, the relation between these resistances is
HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 2

For the circuit shown in the figure,

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HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 7 - Heating Effects of Current>Archives>Q 1
The heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raise the temperature of 0.5 kg water by 40 K. This heater is replaced by a new heater having two wires of the same material, each of length L and diameter 2d. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by 40 K?