Advertisements
Advertisements
प्रश्न
Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
Advertisements
उत्तर
Resistance decreases in parallel combination. S let R resistance is connected to 15 Ω resistance parallel to make resultant 6 ohm.
Now, `1/6 = 1/15 + 1/"R"`
or `1/"R" = 1/6 - 1/15`
`= (5 - 2)/30 = 3/30 = 1/10`
∴ R = 10 Ω
संबंधित प्रश्न
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
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.
What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
What is the equivalent resistance between A and B in the given circuit (Fig?)
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
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 electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in them is in the ratio:
