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Saturday, 31 October

JEE Main · Physics · Current Electricity

Joule Heating and Power

JEE Main asked Joule Heating and Power 15 times in 12 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023, 2024 and 2025. It belongs to Ohm's Law and Resistance, in Current Electricity (Physics). The longest wait between two years asking it was 1 year. In 2021, 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
15
in 12 shifts
Years
6 of 8
First asked
2020
last in 2025
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.17’210.07’220.14’230.19’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 5 in 24 shifts · 2022: 2 in 24 shifts · 2023: 2 in 12 shifts · 2024: 4 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20251 of 8
  • 202423 of 18
  • 202321 of 12
  • 20222 of 24
  • 202124 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Power loss from efficiency
  • Percentage change in power from current change

Difficulty

Easy 11Medium 4Hard 0

7 of the 15 questions had a numerical answer.

Every question

All 15 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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
  2. 31 Jan 2024, Shift 2 · Q41By what percentage will the illumination of the lamp decrease if the current drops by 20%?EasySingle correct
  3. 8 Apr 2024, Shift 2 · Q41Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element…MediumSingle correct
  4. 8 Apr 2024, Shift 2 · Q56A heater is designed to operate with a power of 1000 W in a 100 V line. It is connected in combination with a resistance of 10 Ω10\ \Omega…MediumNumerical valueHas a figure
  5. 4 Apr 2024, Shift 2 · Q42An electric bulb rated 50 WW - 200 VV is connected across a 100 VV supply. The power dissipation of the bulb is:EasySingle correct
  6. 13 Apr 2023, Shift 1 · Q50Different combination of 3 resistors of equal resistance R are shown in the figures. The increasing order for power dissipation is: (A)…MediumDiagram basedHas a figure
  7. 13 Apr 2023, Shift 1 · Q60A potential VoV_o is applied across a uniform wire of resistance R. The power dissipation is P1P_1. The wire is then cut into two equal…EasyNumerical value
  8. 25 Jun 2022, Shift 1 · Q57A resistor develops 300 J of thermal energy in 15 s, when a current of 2 A is passed through it. If the current increases to 3 A, the…EasyNumerical value
  9. 28 Jul 2022, Shift 2 · Q26An electrical bulb rated 220 V, 100 W, is connected in series with another bulb rated 220 V, 60 W. If the voltage across combination is…MediumNumerical value
  10. 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
  11. 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 ________Ω\Omega.…EasyNumerical value
  12. 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
  13. 31 Aug 2021, Shift 2 · Q30A resistor dissipates 192 J of energy in 1 s when a current of 4 A is passed through it. Now, when the current is doubled, the amount of…EasyNumerical value
  14. 26 Aug 2021, Shift 2 · Q17An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V supply. Calculate the resistance R to be connected in series…EasySingle correct
  15. 5 Sep 2020, Shift 1 · Q13An electrical power line, having a total resistance of 2 Ω\Omega, delivers 1 kW at 220 V. The efficiency of the transmission line is…EasySingle correct

Shifts: 5 Sep 2020, Shift 1, 16 Mar 2021, Shift 2, 25 Jul 2021, Shift 1, 26 Aug 2021, Shift 2, 31 Aug 2021, Shift 2, 25 Jun 2022, Shift 1, 28 Jul 2022, Shift 2, 13 Apr 2023, Shift 1, 31 Jan 2024, Shift 2, 4 Apr 2024, Shift 2, 8 Apr 2024, Shift 2, 3 Apr 2025, Shift 2.

Same topic

Other ideas in Ohm's Law and Resistance

Ohm's Law and Resistance has 21 ideas JEE Main has asked; 12 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas