Advertisements
Advertisements
प्रश्न
In the circuit diagram given below, three resistors R1, R2, and R3 of 5 Ω, 10 Ω and 30 Ω, respectively are connected as shown
Calculate:
- current through each resistor.
- total current in the circuit.
- total resistance in the circuit.
Advertisements
उत्तर
a. Let I1, I2 and I3 be the current flowing through the resistors of 5 Ω, 10 Ω and 30 Ω, respectively.
According to Ohm's law, V = IR
Here, V = 12 V and R = 5 Ω
`I = V/R`
`I_1 = 12/5 = 2.4 A`
`I_2 = 12/10 = 1.2 A`
`I_3 = 12/30 = 0.4 A`
b. Total current through the circuit, I = I1 + I2 + I3
= 2.4 A + 1.2 A + 0.4 A
= 4 A
c. The resistors of 5 Ω, 10 Ω and 30 Ω are connected in parallel. Therefore, the net resistance will be:
`1/ R = 1/R_1 + 1/R_2 + 1/R_3`
`1/R = (1/5) + (1/10) + (1/30)`
`1/R = (6 + 3 +1)/30`
`I/R = 10/30`
R = 3 Ω
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
To increase the effective resistance in a circuit the resistors are connected in _____________.
Draw the electrical symbols of the following components and state its use:
Ammeter.
Which particles constitute the electric current in a metallic conductor?
Which of the two is connected in series : ammeter or voltmeter?
What is an Ammeter? How is It Connected in a Circuit? Draw a Diagram to Illustrate Your Answer.
The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:
(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A
In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
State two differences between the e.m.f and terminal voltage of a cell.
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?
The work done in moving unit positive charge across two points in an electric circuit is a measure of
A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
Tick (✓) the correct choice among the following :
There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?
An electric bulb is marked '100 W, 250 V'. What information does this convey?
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
Find the odd one out.
Loudspeaker, Bar magnet/magnet, Electric motor, Microphone.
