Advertisements
Advertisements
प्रश्न
A 10 m long wire of a particular material is of reistance 5Ω What will be the resistance of 5m long wire of same material and the same thickness.
Advertisements
उत्तर
Given: The resistance of 10 m long wire = 5 Ω
R α l for the same thickness material so if the length of wire becomes half of the previous value, resistance will also become 1/2th of its previous value.
Or R = `1/2 xx 5 Omega = 2.5 Omega`
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.
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
What is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 coulombs of charge from one terminal of battery to the other?
The unit for measuring potential difference is:
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 5 C passes through it?
What p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40 Ω?
Explain why potential difference is always less than the e.m.f. of a cell?
Five resistors of different resistances are connected together as shown in the figure. A 12 V battery is connected to the arrangement.
Calculate:
(i) the total resistance in the circuit
(ii) the total current flowing in the circuit.
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
A negative charge will move from ______ to ______ potential.
