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प्रश्न
If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?
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उत्तर
We know that power and potential difference are related to each other as given in the equation P = V2/R.
Now, keeping R the same, if V is doubled, power gets increased by four times.
संबंधित प्रश्न
What is meant by saying that the electric potential at a point is 1 volt?
Name a device which helps to maintain potential difference across a conductor (say, a bulb).
Ohm's law state a relation between potential difference and ___________.
Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
The voltage across a 3Ω resistance is 6 V. How large is the current? What is
the resistance of a filament lamp when a voltage of 3 V across it causes a
current of 0.5 A?
State whether the potential is a scalar or vector?
Point out two differences between e.m.f. and potential difference as applied to electric circuits.
Three resistors are connected to a 6 V battery as shown in the figure given below:
Calculate:
(i) the equivalent resistance of the circuit.
(ii) total current in the circuit.
(iii) potential difference across the 7.2 Ω resistor.
A cell of e.m.f 2.0 V and internal resistance 1Ω is connected to the resistors of 3Ω and 6Ω in series. Calculate:
(i) the current drawn from the cell,
(ii) the p.d. across each resistor,
(iii) the terminal voltage of the cell and
(iv) the voltage drop.
Define electric potential and potential difference.
