Physics
Explain why is the p.d. across the terminals of a cell is more in an open circuit and reduced in a closed circuit.
Current Electricity
108 Likes
Answer
In a closed circuit, the current flows through the circuit. There is a fall of potential across the internal resistance of the cell. Hence, the p.d. across the terminals in a closed circuit is less than the p.d. across the terminals in an open circuit by an amount equal to the potential drop across the internal resistance of the cell.
Hence, the p.d. across the terminals of a cell is more in an open circuit and reduced in a closed circuit.
Answered By
67 Likes
Related Questions
The V-I graph for a series combination and for a parallel combination of two resistors is shown in figure. Which of the two, A or B, represents the parallel combination? Give a reason for your answer.
Explain the meaning of the terms e.m.f., terminal voltage and internal resistance of a cell.
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of combination.