Physics
Answer
E.m.f of cell | Terminal voltage of cell |
---|---|
It is measured by the amount of work done per unit change in moving a positive test charge in the complete circuit inside and outside the cell. | It is measured by the amount of work done per unit charge in moving a positive test charge in the circuit outside the cell. |
It is the the characteristic of the cell, i.e., it does not depend on the amount of current drawn from the cell. | It depends on the amount of current drawn from the cell. More the current drawn from the cell, less is the terminal voltage. |
Related Questions
Write the expressions for the equivalent resistance R of three resistors R1, R2 and R3 joined in (a) parallel, (b) series.
State how are the two resistors joined with a battery in each of the following cases when —
(a) same current flows in each resistor,
(b) potential difference is same across each resistor,
(c) equivalent resistance is less than either of the two resistances,
(d) equivalent resistance is more than either of the two resistances.
Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.
A cell of e.m.f. ε and internal resistance r is used to send current to an external resistance R. Write expressions for (a) the total resistance of circuit, (b) the current drawn from the cell, (c) the p.d. across the cell, and (d) voltage drop inside the cell.