Advertisements
Advertisements
प्रश्न
In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
विकल्प
5J
10J
20J
30J
Advertisements
उत्तर
20J
Explanation -
Since 2Ω and 4Ω are connected in series so their net resistance is
`"R"_"net" = "R"_1 + "R"_2`
`"R"_"net" = 2 + 4`
Rnet = 6Ω
Current (I) in the circuit is given by
`"I" = "V"/("R"_1 + "R"_2)`
`"I" = 6/6`
I = 1A
Heat dissipated through 4Ω resistor is given by
H = I2 × R × t
H = I2 × 4 × 5
H = 20J
APPEARS IN
संबंधित प्रश्न
Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
Draw circuit symbols for
a cell
Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.
How does the short circuit form?
In an electric circuit, electron flow a from of point of ______ potential to the point of ______ potential.
Write the condition required for a circuit to be a closed circuit.
What do you understand by the open electric circuit?
Explain the following:
Closed circuit
The unit of electrical power is _______.
_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.
A device that is used to break an electric circuit is called ______.
What are the types of electric circuits?
In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12 V battery will be
 |
 |
 |
| (i) | (ii) | (iii) |
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
Paheli connected two bulbs to a cell as shown in the following figure.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
Overloading of electric circuits can lead to short-circuiting.
