NEET Physics Current Electricity : Cell in series and Parallel

TL;DR

This video explains the concepts of series and parallel connections of cells in a circuit and how to calculate equivalent EMF, internal resistance, current, and potential difference.

Transcript

hello then this video on meet current electricity is brought to you by example.com no more fear from exam let's not talk about the combination of cells cells in series now when the cells are connected end to end what do we mean by m2 now the way we spoke about resistors in series where the resistors are connected into and similarly when cells are c... Read More

Key Insights

• ❤️‍🩹 Cells connected in series have their positive and negative terminals connected end-to-end.
• 🍹 The equivalent EMF and internal resistance in series connection are the sum of individual EMFs and internal resistances.
• ❎ Cells connected in parallel have all positive terminals connected together and all negative terminals connected together.
• 🍹 The equivalent EMF in parallel connection is the same as the potential difference across each cell, and the equivalent internal resistance is calculated using the reciprocal sum of individual resistances.
• 💼 In a special case where all internal resistances are equal, the equivalent resistance in parallel connection becomes one-third of the individual resistance.
• 🪐 The current from each cell in a series circuit can be calculated using the net EMF divided by the equivalent resistance.
• ✖️ The potential difference across the external resistance in a series circuit is equal to the current multiplied by the resistance value.

Questions & Answers

Q: How are cells connected in series?

Cells are connected in series by connecting the positive terminal of one cell to the negative terminal of the next cell, resulting in the sum of individual EMFs and internal resistances.

Q: How do you calculate the equivalent EMF and internal resistance in series connection?

The equivalent EMF of cells in series is the sum of individual EMFs, while the equivalent internal resistance is the sum of individual internal resistances.

Q: What is the formula for calculating the current from each cell in a series circuit?

The current from each cell in a series circuit is equal to the net EMF divided by the equivalent resistance, which includes both the internal resistance and the external resistance.

Q: How do you calculate the potential difference across the external resistance in a series circuit?

The potential difference across the external resistance can be calculated by multiplying the current through the circuit by the value of the resistance.

Q: How are cells connected in parallel?

Cells are connected in parallel by connecting all positive terminals together and all negative terminals together, resulting in the same potential difference across each cell.

Q: How do you calculate the equivalent EMF and internal resistance in parallel connection?

The equivalent EMF in parallel connection remains the same as the potential difference across each cell. The equivalent internal resistance is calculated using the reciprocal sum of individual resistances.

Q: What is the formula for calculating the total current in a parallel circuit?

The total current in a parallel circuit is equal to the net potential difference divided by the sum of the equivalent resistance and the external resistance.

Q: How does the current divide among cells in a parallel circuit?

In a parallel circuit, the current flowing through each cell is equal, and the total current is the sum of individual currents. Each cell contributes an equal fraction of the total current.

Summary & Key Takeaways

• Cells connected in series means the positive terminal of one cell is connected to the negative terminal of the next, resulting in the total EMF being the sum of individual EMFs and the total internal resistance being the sum of individual internal resistances.

• Cells connected in parallel means all positive terminals are connected together and all negative terminals are connected together, resulting in the same potential difference across each cell and the equivalent EMF and internal resistance being calculated differently.

• In a special case where all internal resistances are equal, the equivalent resistance in parallel connection becomes one-third of the individual resistance.