Advertisements
Advertisements
प्रश्न
Calculate the current flowing through each of the resistors A and B in the circuit shown in the following figure.
Advertisements
उत्तर
Resulting resistance in parallel
`1/"R" = 1/1 + 1/2`
`= (2 + 1)/2`
`= 3/2`
∴ R = `2/3` Ω
V = 2V
∴ current in circuit I = `"V"/"R"`
I = `2/(2/3)`
= `2/2 xx 3`
= 3 A
Now current through 1 Ω resistor I1 = `"V"/"R"_1`
∴ I1 = `2/1`
= 2 A
Current through 2 Ω resistor I2 = `"V"/"R"_2`
∴ I2 = `2/2`
= 1 A
or I2 = I - I1
= 3 - 2
= 1 A
APPEARS IN
संबंधित प्रश्न
By what other name is the unit joule/coulomb called?
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
State whether a voltmeter has a high resistance of a low resistance. Give reason for your answer.
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 5 C passes through it?
What current will be taken by a 920 W appliance if the supply voltage is 230 V?
State the S.I. unit of electric potential.
Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor. How can you find the resistance of the resistor from this graph?
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation R = r1 + r2 + r3 when joined in series.
The figure shows a circuit. When the circuit is switched on, the ammeter reads 0.5 A.
(i) Calculate the value of the unknown resistor R.
(ii) Calculate the charge passing through the 3 Ω resistor in 120 s.
(iii) Calculate the power dissipated in the 3 Ω resistor.
In the figure given below, A, B and C are three ammeters. The ammeter B reads 0.5A. (All the ammeters have negligible resistance.)
Calculate:
(i) the readings in the ammeters A and C.
(ii) the total resistance of the circuit.
