Effects of Electric Current Class 10 SSC || Lecture 2 || Maharashtra state board

Parth Momaya・2 minutes read

The text explains the heating effects of electric current and delves into the formulas for heat generation and electrical power, emphasizing their importance and simplicity. Additionally, it introduces the concepts of energy consumption, electrical meters, and provides numerical examples for practical application of the formulas discussed.

Insights

  • The heat generated by the flow of electric current in devices like toasters and chargers is directly related to the square of the current, resistance of the conductor, and the duration of current flow, as expressed by the formula Heat = I^2 * R * t.
  • Understanding electrical power consumption involves recognizing that power is the energy utilized per unit time, with the formula Power = VI/t, where energy consumed is measured in Joules per second (Watts), highlighting the connection between energy and work and the interchangeability of these concepts.

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Recent questions

  • How do devices like toasters get hot?

    Due to the flow of electric current.

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Summary

00:00

"Heating Effects of Electric Current Explained"

  • The text discusses the heating effects of electric current, mentioning how various devices like toasters and chargers get hot due to the flow of current.
  • It explains that when a potential difference is applied to a conductor, free electrons start moving in a particular direction, colliding with atoms and generating heat.
  • The heat produced is directly proportional to the square of the current, the resistance of the conductor, and the time for which the current flows.
  • The formula for heat generated is given as Heat = I^2 * R * t, where I is the current, R is the resistance, and t is the time.
  • The text also delves into the concept of electrical power, which is the energy consumed per unit time, with the formula Power = VI/t.
  • It further explains that the unit of power is Joules per second (Watt), and the unit of energy consumed is the same, emphasizing the interchangeability of energy and work.
  • The text introduces three formulas for power and three formulas for heat generation, emphasizing their importance and simplicity.
  • It discusses the WH meter used to measure energy consumption, explaining that KWH stands for kilowatt-hour, a larger unit of energy.
  • The text provides a numerical example where heat energy is produced in a circuit at a rate of 100 Joules per second, with a current of 3 amperes flowing through a resistance.

16:41

Calculating Resistance, Current, and Power Consumption

  • Three formulas are available to find resistance, with Formula 1 being applied.
  • The formula for resistance is R = P/A*R^2, which can be rearranged to R = 2*0.5 inches.
  • The resistance value is calculated to be 11.11 ohms.
  • Two bulbs are connected in parallel with a potential difference of 220 volts each.
  • The total current flowing through both bulbs is 0.73 amperes.
  • The power consumption of a TV running for 30 minutes is 500 watts.
  • The electrical consumption expense for running an iron for 2 hours daily for 30 days in April is calculated to be ₹330.
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