Advertisements
Advertisements
प्रश्न
Write any two characteristics of a series combination of resistors.
उत्तर
Characteristics of series combination of resistors:-
- The same current flows through each resistor.
- The voltage (potential difference) across the combination is equal to the sum of the voltage drops across the individual resistors.
- The effective resistance of the combination is equal to the sum of the individual resistances.
- The effective resistance of the combination is greater than any of the individual resistances.
- The voltage across each resistor is directly proportional to the resistance of the resistor.
- The series combination can be used to increase the resistance in a circuit.
APPEARS IN
संबंधित प्रश्न
Find the expression for resistors connected in series.
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
Give one example to show how the resistance depends on the nature of material of the conductor.
How does the resistance of a wire change when:
its length is tripled?
State the effect of rise in temperature on the resistance of semi-conductors.
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
Six equal resistors of 1 ohm each are connected to form the sides of a hexagon ABCDEF. Calculate the resistance offered by the combination if the current enters at A and leaves it at D.
Two lamps of resistance 30Ω and 20Ω respectively are connected in series in a 110V circuit. Calculate:
(i) the total resistance in the circuit
(ii) the current in the circuit, and
(iii) the voltage drop across each lamp.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
With the help of a circuit diagram derive the formula for the resultant resistance of three resistances connected:
- in series and
- in parallel
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
The resistance of the hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use?
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is: