Advertisements
Advertisements
प्रश्न
Calculate the equivalent resistance between P and Q from the following diagram:
उत्तर
`1/"R"_1 = 1/20 + 1/5`
`1/"R"_1 = (1 + 4)/20 = 5/20`
R1 = 4 Ω
Now, 3 Ω, 4 Ω and 2 Ω in series.
So, R = 3 + 4 + 2 = 9 Ω
APPEARS IN
संबंधित प्रश्न
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
V = IRTwo resistances X and Y are connected turn by turn : (i) in parallel, and (ii) series. In which case the resultant resistance will be less than either of the individual resistances?R = R1+ R2+ R3
A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:
(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor
In series combination of resistances ______.
What do you mean by power rating of an electrical appliance? How do you use it to calculate
(a) the resistance of the appliance and
(b) the safe limit of the current in it, while in use?
State expression for Resistance connected in parallel.
What is a resistance? Define it with respect to Ohm’s law,
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.
What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)
