Advertisements
Advertisements
प्रश्न
Explain why potential difference is always less than the e.m.f. of a cell?
Advertisements
उत्तर
When a cell is in closed circuit, i.e., when current is drawn from it, then the potential difference between its electrodes is called the terminal voltage. It is always less than the e.m.f. because when charge flows in a circuit, some energy is spent in the flow of charge through the electrolyte of the cell.
संबंधित प्रश्न
A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.
Find:
1) Current in the circuit
2) The terminal voltage of the cell
3) The potential difference across 6Ω Resistor
4) Electrical energy spent per minute in the 4Ω resistor.
By what other name is the unit joule/coulomb called?
What is meant by saying that the electric potential at a point is 1 volt?
Write down the formula which states the relation between potential difference, current, and resistance.
State the S.I. unit of electric potential.
Define the term ‘volt’.
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is stretched to double its length?
A boy records that 4000 joules of work are required to transfer 10 coulombs of charge between two points of a resistor of 50 Ω. The current passing through it is:
Assertion (A): Charges flow from higher potential to lower potential.
Reason (R): Current flows mainly due to the flow of electrons.
