Advertisements
Advertisements
प्रश्न
When do you say that the resistors are connected in this way? Draw a circuit diagram.
Advertisements
उत्तर
Resistors connected in series: - If the number of resistance are connected one after another in such a way that the same current flows through each resistance, then the arrangement is called resistance in series.
Let R1, R2, and R3 are three resistances connected in a series combination and let be their effective resistance in the circuit.
Let V1, V2, and V3 be the P.D. across resistances R1, R2, and R3 respectively. Let ‘V’ be the P.D. of the cell. Let ‘I’ be the current flow through each resistance.
According to Ohm’s Law,
Conclusion:
If the resistors are connected in series then.
- In a circuit, the current is the same in every part of the circuit.
- The resistance of the combination of resistors is equal to the sum of the individual resistors.
- The total voltage across the combination is equal to the sum of the voltage drop across the separate resistors.
- The effective resistance in a series combination is greater than the individual resistances.
- This combination is used to increase resistance in a circuit.
APPEARS IN
संबंधित प्रश्न
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Why is the series arrangement not used for domestic circuits?
Find the equivalent resistance between A and B
How does the resistance of a wire change when:
its length is tripled?
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?
Choose the correct alternative and rewrite the following sentence.
If three resistors 2 ohms, 3 ohms and 4 ohms are connected in series, then the effective resistance in the circuit will be _______ ohms.
State the effect of rise in temperature on the resistance of semi-conductors.
How does the resistivity of a semiconductor depend on temperature?
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two 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?
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.
