Cells in Series and in Parallel

The video tutorial explains how cells, like resistors, can be combined in electric circuits. It covers the series and parallel combinations of cells, detailing how to calculate equivalent EMF and internal resistance. The series combination involves summing individual EMFs and resistances, while the parallel combination requires more complex calculations involving currents and potential differences. The tutorial provides equations for both combinations and discusses how these principles can be extended to multiple cells.

What is the purpose of combining cells in an electric circuit?

• To increase the resistance

• To simplify the calculation of currents and voltages

• To decrease the EMF

• To increase the complexity of the circuit

In a series combination of two cells, what is the potential difference between the positive and negative terminals of the first cell?

• I*(R1 + R2)

• E1 + E2

• E2 - I*R2

• E1 - I*R1

How is the equivalent EMF of a series combination of N cells determined?

• By taking the average of their EMFs

• By subtracting the smallest EMF from the largest

• By summing their individual EMFs

• By multiplying their individual EMFs

What is the equivalent internal resistance of a series combination of N cells?

• The average of their internal resistances

• The product of their internal resistances

• The sum of their internal resistances

• The difference between the largest and smallest internal resistance

In a parallel combination of cells, what is the relationship between the total current and the currents from individual cells?

• The total current is the product of individual currents

• The total current is the sum of individual currents

• The total current is the difference between the largest and smallest current

• The total current is the average of individual currents

How is the equivalent EMF of a parallel combination of two cells calculated?

• By using the formula: (E1*R2 + E2*R1) / (R1 + R2)

• By adding the EMFs of the two cells

• By subtracting the EMF of the second cell from the first

• By multiplying the EMFs of the two cells

What happens to the equations for parallel combinations if the negative terminal of the second cell is connected to the positive terminal of the first?

• The equations become invalid

• The equations remain valid but Epsilon 2 is considered negative

• The equations need to be recalculated

• The equations remain unchanged