NEET Physics Current Electricity : Multiple Choice Previous Years Questions MCQs 7

TL;DR

This video explains the concept of current electricity and provides a step-by-step calculation for determining the internal resistance of a battery.

Transcript

hello friends this video on need current electricity is brought to you by example.com nobody from exam in Arma 2 entity a current of fuel amperes goes through a two older sisters when connected across a battery the same battery supplies a current of 0.5 amperes and connected across a 9 ohm resistor the internal resistance of the battery is so here ... Read More

Key Insights

• 🌍 The internal resistance of a battery can be calculated by comparing the equations E = I1R + I1r and E = I2R + I2r.
• ⚡ Voltage is related to energy through the equation voltage = energy/charge.
• 🏑 Electric field is the potential gradient and can be calculated using the equation E = V/r.

Questions & Answers

Q: How is the internal resistance of a battery calculated?

The internal resistance of a battery can be calculated by using the equation E = I1R + I1r and E = I2R + I2r, where E is the electromotive force, I is the current, R is the external resistance, and r is the internal resistance. By comparing the equations, you can solve for r.

Q: What is the relationship between energy and voltage?

Voltage is equal to energy per unit charge. In this video, it is mentioned that 1 electron volt is equal to 1.6 x 10^-19 joules. Therefore, the relationship between energy and voltage is given by voltage = energy/charge.

Q: How is electric field related to potential?

Electric field is the potential gradient, which is the changing potential with distance. In this video, it is mentioned that the electric field (E) is equal to the potential (V) divided by the mean free path (r). Therefore, E = V/r.

Q: What is Kirchhoff's loop law?

Kirchhoff's loop law states that the sum of the electromotive forces (EMFs) in any closed loop of an electric circuit is equal to the sum of the potential drops. In this video, it is used to derive the equation for the given electrical circuit.

Summary & Key Takeaways

• The video discusses two scenarios: one where a battery is connected to a 4-ohm resistor, and another where it is connected to a 9-ohm resistor.

• By using the equation E = I1R + I1r and E = I2R + I2r, the internal resistance of the battery can be calculated.

• The internal resistance is found to be 1/3 ohms.