Advertisements
Advertisements
प्रश्न
You are supplied with a number of 100 Ω resistors. How could you combine some of these resistors to make a 250 Ω resistor?
Advertisements
उत्तर
When two 100 Ω resistors are connected in parallel, the value of the combined resistance becomes 50 Ω.
Now to get a resistance of 250 Ω, we must connect two more 100 Ω resistors in series with the above combination.
Therefore, the configuration will be two 100 Ω resistors in series with a parallel combination of another two 100 Ω resistors.
APPEARS IN
संबंधित प्रश्न
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
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.

Find the equivalent resistance between points A and B

When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
State how are the two resistors joined with a battery when same current flows in each resistor.
When do you say that the resistors are connected in this way? Draw a circuit diagram.
What material is used for making wire to prepare heating coils? Give a reason.
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
How does the resistivity of an alloy such as constantace depends on temperature.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
State expression for Resistance connected in series.
Write an expression for calculating electrical power in terms of current and resistance.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
2Ω resistor A, 1Ω resistor B and 4Ω resistor C are connected in parallel. The combination is connected across a 2V battery of negligible resistance. Draw the diagram of the arrangement and calculate:
(i) The current in each resistor A and C,
(ii) The current through battery.
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
