JEE Main Physics · Current Electricity
Joule Heating and Power
Joule Heating and Power (Current Electricity) was asked 5 times in 4 JEE Main shifts, 2021–2025, out of the 42 shifts Lumi analysed. 2 of the 5 had a numerical answer.
- Times asked
- 5
- in 4 shifts
- Years
- 2021–2025
- Usual format
- Single correct
- Calculation
- Pattern
- Comes in cycles
- repeats across shifts
How it is asked
- Power loss from efficiency
- Percentage change in power from current change
Difficulty
Easy 5Medium 0Hard 0
Where it sits
Chapter: Current Electricity. Topic: Ohm's Law and Resistance, 25 questions over 13 ideas.
Other repeat ideas in this topic
Every time it came
All 5 questions
Newest first, each with its options and official answer.
- 3 Apr 2025, Shift 2 · Q39A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of cal/s isEasySingle correct
- 31 Jan 2024, Shift 2 · Q41By what percentage will the illumination of the lamp decrease if the current drops by 20%?EasySingle correct
- 25 Jul 2021, Shift 1 · Q27An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the…EasyNumerical value
- 16 Mar 2021, Shift 2 · Q18A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5 A to…EasySingle correct
- 16 Mar 2021, Shift 2 · Q28The energy dissipated by a resistor is 10 mJ in 1 s when an electric current of 2 mA flows through it. The resistance is ________.…EasyNumerical value